Sold Specimens, Gallery D
Dolomite and Donnayite-(Y)
from Mont St-Hilaire
DAD9-1 Dadsonite in Siderite $35 SOLD
Ubaye valley, Alpes-de-Haute-Provence,
3.7 cm x 2 cm x 2.3 cm
A seam of black Dadsonite (Pb23Sb25S60Cl) sandwiched between layers of tan Siderite (FeCO3) from a classic locality in France. Dadsonite was named after Canadian mineralogist Alexander S. Dadson.
nodule $45 SOLD
This Datolite (CaB[OH|SiO4]) half-nodule shows flecks of bright copper inclusions, as is visible in the close-up on the right. The oldest lava flow known on Earth is located on the Keweenaw Peninsula of Michigan (according to Wikipedia), as well as the largest native copper deposit in the world. Scouring of the area by glaciers during the last Ice Age helped to uncover these treasures. This nodule has some spots of orange fluorescence under SWUV, especially on the back.
DECR9-2 Decrespignyite-Y $28 SOLD
copper mine, Yunta, North Mt Lofty Ranges
This specimen is richly covered with blue spheres of Decrespignyite (Cu(Y,REE)4(CO3)4Cl(OH)5·2H2O). Most of the spheres are so densely packed that they have coalesced, but in some places the individual balls are naked-eye visible. This specimen is from the type locality, a small copper mine that is known for an unusual collection of REE carbonates. REE means Rare Earth Elements which is a designation for the following group of 17 elements: scandium, yttrium, lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium. By using REE, the chemical formula indicates that any of these elements are acceptable constituents.
DENIS9-1 Denisovite $40 SOLD
Mt, Khibiny Massif, Kola Peninsula
5 cm x 4 cm x 2.7 cm
White fibrous Denisovite (Ca2(K,Na)Si3O8(F,OH)2) on a matrix of Aegirine (NaFe3+[Si2O6]) from the type locality. Denisovite is only known from one other locality outside the Khibiny Massif. Denisovite is an asbestiform mineral, meaning that it resembles the six minerals that are legally defined as asbestos, but is not one of them. Asbestiform minerals are perfectly safe in a mineral collection.
DEST10-3 Destinezite (TL) $18 SOLD
Argenteau, Visé, Liège Province, Belgium
A nodule of the rare mineral Destinezite Fe23+[OH|SO4|PO4]·6H2O from the co-type locality.
DEV9-1 Devilline $38 SOLD
Mucho Grande Mine, Uravan District, San Miguel Co., Colorado
8.8 x 4 x 2.6 cm
green on this rock is the Devilline (CaCu4(SO4)2(OH)6·3H2O)
but the blue is not identified - I need a Raman spectrometer for Xmas,
Santa! This specimen
comes with a label from Dakota Matrix Minerals and one from Forrest
and Barbara Cureton that only mentions the green Devilline, so I guess
neither of them has a Raman spectrometer either...?
DC9-1 Dioptase in Calcite $195 SOLD
Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia
7 x 5.5 x 2.5 cm
mound of honey-colored Calcite rhombs included with tiny Dioptase crystals.
In some places, the Dioptase forms oriented sheets and lines,
while in other places the individual Dioptase crystals are naked-eye
visible. This specimen is mounted on an acrylic cylinder, which
I can remove if you wish.
Dioptase (TL) on Quartz $575 SOLD
A large, showy Dioptase (Cu6(Si6O18)·6H2O) from the type locality, nearly pristine, and with crystals to 0.9 cm. Nothing can top the color of Dioptase, and this is a large piece that definitely deserves to be on display. Curiously, if it were from Tsumeb, the price would need to have another zero; but the type locality does not command the same prices, so this is a way for most collectors to be able to put a display-size Dioptase on their shelves.
DOL9-1 Dolomite $28 SOLD
Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia
5 cm x 4.3 cm x 1 cm
This crust of sparkling, red-brown Dolomite (CaMg(CO3)2) forms a distorted map of Australia that is only a couple of millimeters thick. There's a small, clear Calcite or two on top of the Dolomite, and several more on the backside, so whatever produced the crust must have dissolved away before the Calcites formed.
Dresserite (TL) $45 SOLD
More than a dozen balls of white Dresserite (BaAl2[(OH)2|CO3]2• H2O) from the type and apparently only locality. The Dresserite fluoresces white in both SWUV and LWUV, and the matrix hosts some other microminerals that fluoresce yellow and red. This quarry was closed in 1981, and according to www.mindat.org, will never be active again. So these older specimens are currently the only source of this mineral.
DUMOR9-1 Dumortierite $25 SOLD
Gora Aktash, Tashkent Viloyati, Uzbekistan
3.7 cm x 2.5 cm x 2 cm
The Dumortierite (Al,Fe3+)7[O3|BO3|(SiO4)3] is the blue portion of this specimen. Interestingly, Uzbekistan is not even mentioned by mindat.org as a locality for Dumortierite, but the specimen was obtained from Dmitriy Belakovskiy, a curator of the Fersman Mineralogical Museum, so I trust the identification and locality information. It comes with his style of label (it doesn't mention his name, but anyone who has purchased rocks from him at mineral shows will recognize it), glued to the box, with the mineral name written in Russian and the chemical formula supplied.
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