Mont Saint-Hilaire is the largest of 10 plutons located in the St. Lawrence lowlands that are collectively known as the Monteregian Hills. Currently, there are 383 valid minerals and 58 type localities that have been found at Mont Saint-Hilaire.
Quarrying at Mont Saint-Hilaire began in 1959. In 1961, Uni-Mix Inc. opened the Desourdy Quarry. Both of these were incorporated into the Demix Quarry in 1974. All of the workings currently fall under the name Poudrette Quarry; the former Demix Quarry is now the western part of the Poudrette Quarry, so it is useful to retain the Demix locality, as it indicates a portion of the current Poudrette Quarry.
These specimens represent a portion of the suite of Mont Saint-Hilaire minerals assembled by long-time mineral collector Thomas Fitzpatrick, many having come to him from the Ron Waddell collection. Mr. Waddell was renowned for his knowledge of the mineralogy of Mont Saint-Hilaire.
Analcime and Polylithionite $18 SOLD
A quite aesthetic Analcime (Na2(Al2Si4O12)·2H2O) nestled in a bed of Polylithionite (KLi2Al(Si4O10)(F,OH)2). The handwritten card is from Ron Waddell.
Ankerite on Siderite $26 SOLD
White epitactic Ankerite (Ca(Fe2+ ,Mg,Mn2+)(CO3)2) rhombs on a tan Siderite (FeCO3) crystal. According to the handwritten card from Ron Waddell, the Ankerite was confirmed by Dr. George Chao, Carleton University, Ottawa, Canada. The Ankerites are easily naked-eye visible.
Astrophyllite $28 SOLD
Mont Saint-Hilaire, Rouville RCM, Montérégie, Québec,
Bright Astrophyllite ((K,Na)3(Fe,Mn)7Ti2Si8O24(O,OH)7) crystals in clusters and sprays. The two biggest clusters of crystals are shown close up in the lower photos.
Bastnäsite-(Ce) on Polylithionite $38
Spiky rounded masses, which is a very bizarre and unusual habit of tan Bastnäsite-(Ce) ((Ce,La)(CO3)F), topping a pile of silvery blades of Polylithionite (KLi2Al(Si4O10)(F,OH)2). The Bastnäsite-(Ce) is easily appreciated without a loupe. The handwritten card is from Ron Waddell.
Berthierine with Rhodochrosite and Mica $65
Plentiful yellowish-olive Berthierine ((Fe,Fe,Mg)2-3(Si,Al)2O5(OH)4) crystals with an overgrowth of something darker on the ends, accompanied by a Rhodochrosite crystal (top right) and Mica. Although the crystals are visible to the naked eye, a loupe or microscope will enhance your enjoyment of this specimen. In particular, there is one unusual Berthierine crystal whose darker overgrowth went off at a different angle - see the bottom right photo. The handwritten card is from Ron Waddell.
Carletonite (TL) $38 SOLD
Mont Saint-Hilaire is the type locality (TL) and so far, it is still the only locality for Carletonite (KNa4Ca4Si8O18(CO3)4(OH,F)·H2O). Carletonite is also one of the most desirable species from Mont Saint-Hilaire. The handwritten card is from Ron Waddell.
Now this one is a bit of a puzzle because Ron Waddell's label makes reference to UK-58 (i.e., Unknown #58; Mont Saint-Hilaire had so many unidentified species that they were numbered up to #113). UK-58 turned out to be Charmarite (Mn4Al2(CO3)(OH)12·3H2O), but on the label, he says UK-58 is Hydrotalcite (Mg6Al2(CO3)(OH)16·4H2O), which is chemically similar but has not been confirmed at MSH. My guess is that the preliminary analysis indicated Hydrotalcite, but refinements of the analysis later gave Charmarite, a new mineral. The UK-58 is said by Mr. Waddell to be present as tan micaceous groups, which are easy to spot on the specimen and are shown in the middle right photo and the lower left photo. In addition, this amazing little specimen contains orange Pyrochlore crystals (middle left), gray Ancylite-(Ce) pseudomorphs (spiky groups in lower left photo, note especially the partially hollow one on the left edge of the photo), Siderite rhombs (lower right photo) and some unidentified dark gray disc-like crystals (also in the lower right photo) which resemble Synchysite. I also found some isolated crystals shown in the upper right that resemble published Charmarite photos of a different habit. There's a lot going on in this specimen.
Dolomite and Siderite $38
I almost did not look at this specimen under the microscope since it is easy to enjoy without magnification, but I am certainly glad I did. The Dolomite (CaMg(CO3)2) crystals have the most amazing edges, as if they were wrapped in plastic wrap! The bottom two photos show what I mean. Dolomite of this habit is rare from Mont Saint-Hilaire. The handwritten card is from Ron Waddell.
DONN9-1 Donnayite-(Y) on Albite with Pyrite $55 SOLD
Quarry, Mont Saint-Hilaire
6.3 cm x 4 cm x 4 cm; largest crystal = 8 mm
Donnayite-(Y) (Sr3NaCaY(CO3)6·3H2O) is an extremely rare mineral found in only half a dozen localities worldwide, the most well-known of which is the Poudrette Quarry at Mont Saint-Hilaire, also the type locality. Mont Saint-Hilaire produces the largest and best crystals, although it is still rare to get crystals more than a few millimeters in size. The largest Donnayite on this specimen is 8 mm, with at least 2 dozen other smaller ones. Donnayite forms pseudohexagonal crystals of varying cross-section, reminiscent of its chemical relative, Weloganite. The well-formed while Albites and the sprinkling of bright Pyrite give this rare specimen an unusual beauty.
Fluorite and Rhodochrosite $18 SOLD
Green and purple Fluorite (CaF2) and pink Rhodochrosite (MnCO3) make this a colorful specimen for Mont Saint-Hilaire. The green Fluorite crystals are a bit contacted, but the color is good and they fluoresce very strongly purple in LWUV. The handwritten card is from Ron Waddell.
Gaidonnayite (TL) and (?) Siderite on Albite $42 SOLD
Two complex, colorless Gaidonnayite (Na2Zr[Si3O9] · 2H2O) crystals are perched on an Albite matrix. The Gaidonnayites are shown in the upper right photo and in both photos of the middle row. The Gaidonnayites fluoresce yellow-green under SWUV. Mont Saint-Hilaire is the type locality (TL) for Gaidonnayite. Also on this specimen is an unusual yellowish crystal (in both photos of the bottom row) that appears to be a compound of smaller, rhombic crystals (Siderite?); the species is not identified on the label. All minerals are naked-eye visible.
Genthelvite $22 SOLD
A solid carpet of Genthelvite (Zn4(Be3Si3O12)S) crystals covers the tan surface visible in the upper left photo. The lower photos show close-ups. The Genthelvite-covered area fluoresces green under LWUV & SWUV, and phosphoresces under SWUV. The handwritten note is from Ron Waddell, as is a collection sticker on the bottom of the Perky box that gives 1972 as the year of collection.
Gmelinite $32 SOLD
Mont Saint-Hilaire, Rouville RCM, Montérégie, Québec,
Clear Gmelinite ((Na2,Ca)Al2Si4O12·6H2O) tabular hexagonal crystals (see lower right photo) and rosettes (including one on an Aegerine blade, lower left). The Gmelinites fluoresce green under SWUV. A loupe or microscope is required to see the Gmelinites. The handwritten card is from Ron Waddell.
Gonnardite (originally called Tetranatrolite) $28
Tetranatrolite was originally reported from Poudrette quarry (which was considered to be the type locality at the time), but in 1999, it was discredited in favor of the existing zeolite species, Gonnardite ((Na,Ca)2(Si,Al)5O10·3H2O). The chemical compositions as well as the structural relationships between Gonnardite and Tetranatrolite remain controversial. The Gonnardite is naked-eye visible, but a loupe or microscope is required to see the "detached and dehydrated" nature of the epitactic Gonnardite coatings, as referred to in the handwritten note from Ron Waddell.
Götzenite, Natrolite, Fluorite, Calcite, Mica $45
White to pale yellow bladed Götzenite : Na2Ca5Ti[F4|(Si2O7)2], singly and in groups, in vugs and on Calcite-Fluorite-Mica matrix. The yellow paper arrow in the upper left photo points to the group in the photo at lower right, and another paper arrow on the backside points to the group at upper right. Götzenite is an extremely rare mineral and is only ever found in small crystals; a loupe or microscope is required to enjoy this specimen. The handwritten card is from Ron Waddell.
Götzenite, Natrolite, Fluorite, Calcite, Mica $48
Straw-colored, bladed Götzenite (Na2Ca5Ti[F4|(Si2O7)2], in the center of the lower left photo, and on the left edge of the lower right photo), clear hexagons of Calcite (CaCO3), and black stacks of Mica on a Natrolite-Fluorite matrix. Götzenite is an extremely rare mineral and is only ever found in small crystals, so a loupe or microscope is required to enjoy this specimen. The handwritten cards are from Ron Waddell.
Götzenite $65 SOLD
The vug in the center of the specimen (see upper left photo) contains a relatively large and quite fantastic spray of yellow-tan bladed Götzenite (Na2Ca5Ti[F4|(Si2O7)2]), which prompted Ron Waddell to write "KEEP" on the label (see upper right photo), since it was unique. Götzenite is not usually so orderly; this is the first time I've seen it all together in one spray instead of scattered around. The spray is 3 mm wide, so if you want a naked-eye Götzenite, this is about as good as it gets. The pink material next to the Götzenite is probably Ancylite-(Ce).
Gypsum $25 SOLD
Gypsum (CaSO4·2H2O) in three small crystal groups; Gypsum is rare at Mont Saint-Hilaire. There are also a few shiny metallic patches of what looks like Molybdenite. A loupe or microscope is definitely required to enjoy this specimen. The handwritten card is from Ron Waddell.
Hochelagaite (TL) $48 SOLD
In the middle of the specimen (see upper left photo), there is a curving arc of white Hochelagaite ((Ca,Na,Sr)(Nb,Ti,Si,Al)4O11·8H2O) in tufts and sprays (see bottom photos). Although the patch of Hochelagaite is visible to the naked-eye, a loupe or microscope is required to truly enjoy this specimen. The handwritten card is from Ron Waddell.
Lamprophyllite $38 SOLD
Lamprophyllite ((Sr,K,Ba)2(Na,Ti,Mn2+,Fe3+)4Ti2(Si2O7)2O(O,OH,F)) in good crystals from Mont Saint-Hilaire is rare, and this one can be appreciated with the unaided eye. The handwritten card is from Ron Waddell.
Magnesite and Serpentine $38
White botryoidal and massive Magnesite (MgCO3 - top left and bottom left) intermingled with fibrous Serpentine (upper right photo). Magnesite is uncommon at Mont Saint-Hilaire. The handwritten card is from Ron Waddell.
Monteregianite (TL), Lorenzenite, Aegerine & Yofortierite (TL) $42
This piece contains a whole zoo of species. Flat-lying planks of ivory-colored Monteregianite-(Y) ((Na,K)6(Y,Ca)2Si16O38·10H2O) are naked-eye visible and are shown in all 3 right-hand photos. Hairy tan Lorenzenite (Na2Ti2(Si2O6)O3, visible in bottom left photo) and hairy brown Yofortierite (Mn5Si8O20(OH)2·8-9H2O)) require a loupe or a microscope to be appreciated. Black ubiquitous Aegirine (NaFe3+Si2O6) completes the ensemble.
Mosandrite and Fluorite $40 SOLD
Tan sprays of Mosandrite : Na2Ca4(REE)(Si2O7)2OF3 are frozen in Fluorite (CaF2) matrix. This attractive specimen can be easily enjoyed without a loupe. The handwritten card is from Ron Waddell.
Mosandrite $25 SOLD
Straw-colored Mosandrite (Na2Ca4(REE)(Si2O7)2OF3 - see lower left photo) and red Villiaumite (NaF - see lower right photo). Both species are naked-eye visible. The handwritten card is from Ron Waddell.
A cluster of greenish tabular Narsarsukite (Na2(Ti,Fe)Si4(O,F)11) with fantastic luster.
Petarasite (TL) $35 SOLD
A large piece (somewhat crumbly) with many areas of yellowish Petarasite (Na5Zr2(Si6O18)(Cl,OH)·2H2O, as shown in the lower left photo). Also a vug filled with unknown tan balls (lower right photo). The card is from Helen and Ewald Gerstmann.
Mont Saint-Hilaire, Rouville Co., Québec, Canada
3.8 x 2.2 x 1.5 cm
A nugget-shaped rock built up of silvery scales of feather-light Polylithionite (KLi2Al[(F,OH)2|Si4O10]) that fluoresces yellow under SWUV. Polylithionite is one of many fluorescent species that hail from the famous Mont Saint-Hilaire quarry.
Rhodochrosite $140 SOLD
Rhodochrosite (MnCO3) from Mont Saint-Hilaire comes in a variety of forms and colors. This one displays an unusual trigonal shape with both dark and medium red colors in a contact twin habit. See Mineralogical Record 14:363-4 and 21:332-3 for more information on twins, including photos. This type of twin was found just once in the late 1970s. This is a very rare thumbnail mineral specimen for the Rhodochrosite specialist or Mont Saint-Hilaire collector. When purchased with one of my mineral specimens, the Mineralogical Record issues mentioned above can be ordered for $10 and $12, respectively.
Sodalite $25 SOLD
A pretty little Sodalite (Na8(Al6Si6O24)Cl2) crystal group from the Petarasite trench of 1980, with a rough coating of Natrolite and Calcite. Small patches of the Sodalite must make it through the crust because they fluoresce orange under LWUV. Just visible in the photo, sticking out from behind the Sodalite, is a crystal of black Arfvedsonite ([Na][Na2][Fe42+Fe3+]Si8O22(OH)2). The handwritten tag is from Ron Waddell.
Tenebrescent Sodalite $32 SOLD
piece is almost pure Sodalite (Na8(Al6Si6O24)Cl2),
as I discovered when I hit it with UV (bottom left photo). But
then came a most pleasant surprise - portions of the Sodalite changed
color from light gray to reddish purple (bottom right photo) and remained
purple as long as I left it in the dark. When exposed to my
Ott lamp, the purple areas reset to gray in less than a minute if
I held it close. (Usually they will reset in the dark, too, but it
takes a couple weeks.) The Sodalite crystal (middle photos) is also
quite nice and rather unusual, since nearly all Sodalite is massive.
That's why Ron Waddell underlined XLS (meaning crystals, wow!)
Poudrette Quarry, Mont Saint-Hilaire, Rouville RCM, Montérégie, Québec, Canada
2.5 cm x 1.7 cm x 1.5 cm
A beautiful, translucent, light-olive Sphalerite (ZnS) crystal from one of the world's most famous rare-mineral localities. The camera could not capture the yellow-orange color under LWUV, which is more yellow than the photo. This large crystal displays a very complex form (typical of Sphalerite), and I can clearly see natural growth features on all the surfaces. The green color is the rarest and most desirable.
Steacyite (TL), Analcime, Bastnäsite-(Ce) & Raite(?) $48
The material originally called Ekanite from Mont Saint-Hilaire was actually identified to be a new mineral in 1981, and was subsequently renamed Steacyite ([ ],K)(Na,Ca)2(Th,U)[Si8O20]. (The chemical formula from MinDat does indeed contain blank brackets, and I assume that means some portion of it is either variable or as yet unidentified.) Although Ron Waddell calls this a Steacyite specimen, the pink puffballs of Bastnäsite-(Ce) : (Ce,La)(CO3)F impaled on Aegerine blades (upper right and lower left photos) steal the show. The upper right photo shows blocks of squarish cross-section that are apparently Steacyite. The golden, fibrous mineral in the lower right photo is an unidentified mineral that is probably Raite. A loupe or microscope is required to truly enjoy this specimen.
Tiny white balls of Strontianite (SrCO3) fluoresce bright green in LWUV. The Strontianite balls are easily naked-eye visible. The handwritten card is from Ron Waddell.
Villiaumite $28 SOLD
Deep red cubes of rare Villiaumite (NaF) in relatively large crystals for Mont Saint-Hilaire. A second tag (not shown) that comes with this specimen says, "Do not wash (it will disappear) or breathe on it too much." The handwritten cards are from Ron Waddell.
Wulfenite, Calcite, Galena, Eudialyte, Natrolite, Aegerine, and Unknown (possibly
Fluorite) $65 SOLD
Tiny white acicular Wulfenites (Pb[MoO4] - bottom row of photos) and yellowish acicular Calcite (Ca[CO3] - second-row left photo)), in groups on a Galena (PbS) crystal; a ball of an unknown mineral (see center-right photo; possibly Fluorite CaF2); needles of dark Aegerine (NaFe3+Si2O6) coated with Natrolite (Na2Al2Si3O10, see third-row left photo); and a few equant crystals of pinkish-red Eudialyte (Na15Ca6(Fe2+,Mn2+)3Zr3[Si25O73](O,OH,H2O)3(OH,Cl)2), with partial Natrolite coating (see third-row right photo). Everything except for the Wulfenites is naked-eye visible; Wulfenite is extremely rare from Mont Saint-Hilaire and the largest found is about 0.2 mm. The handwritten card is from Ron Waddell.
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