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6323 results

Mineral

Dubińskaite

dubińskaite

Formula
Ca4Sc2Al4[Be2Si8O30](OH)2
Dufrénite Locality: Wheal Phoenix (Phoenix United Mine; West Phoenix Mine), Linkinhorne, Caradon & Phoenix Area (South-Eastern Bodmin Moor), Liskeard District, Cornwall, England, UK (Locality at mindat.org) Size: 7.4 x 4.0 x 2.2 cm. Dufrenite is a rare, secondary mineral of calcium, iron phosphate commonly found in iron ore deposits and in vein gossans. A well-placed vug in hematite matrix is lined with lustrous, blue-green dufrenite botryoids. The two broken botryoids reveal the radial growth pattern of the dufrenite. This fine, old-time piece comes from a classic Cornwall locality - the Wheal Phoenix. The piece is accompanied by an expertly handwritten, faded label from an older collection. The collection this came out of was a museum stash dating to prior to World War I. Easily over 100 years old. Mineral

Dufrénite

dufrénite
Dufrénoysite Locality: Lengenbach Quarry, Im Feld (Imfeld; Feld; Fäld), Binn Valley, Wallis (Valais), Switzerland (Locality at mindat.org) Size: 7.3 x 5.7 x 3.2 cm. From the type locality for this rare species, here is a beautiful, extremely metallic and lustrous, 9-mm crystal in a protected cavity of sugary dolomite matrix. From the collection of a longtime Lengenbach collector. Mineral

Dufrénoysite

dufrénoysite

Formula
Pb2As2S5
Mohs
3
Duftite Locality: Sanyati Mine, Kadoma District, Mashonaland West, Zimbabwe Field of view 5 mm. Specimen and photo Leon Hupperichs. Mineral

Duftite

duftite

Formula
PbCuAsO4(OH)
Mohs
4.5
Dugganite Fundort: Tombstone, Cochise County, Arizona, USA Greenish dugganite. Picture size 1.8 mm. Collection and foto Thomas Witzke. Mineral

Dugganite

dugganite

Formula
Pb3Zn3(TeO6)(AsO4)2
Mohs
3
Mineral

Dukeite

dukeite

Formula
Bi³⁺24Cr⁶⁺8O57(OH)6·3H2O
Mineral

Dulanggouite

dulanggouite

Formula
Bi6Te3
Mineral

Dumontite

dumontite

Formula
Pb2(UO2)3O2(PO4)2·5H2O
Dumortierit (Psáry), 14 mm Mineral

Dumortierite

dumortierite

Formula
AlAl6BSi3O18
Dundasite Field of view: 5 mm Locality: Le Rocheux Mine, Theux, Verviers, Belgium Mineral

Dundasite

dundasite

Formula
PbAl2(CO3)2(OH)4·H2O
Mohs
2
Durangite Locality: Unnamed prospects, Sawmill Creek, Taylor Creek District, Catron Co., New Mexico, USA Field of view 4 mm. Specimen and photo Leon Hupperichs. Mineral

Durangite

durangite

Formula
NaAlAsO4F
Mohs
5.5
Outstanding grey crystals of the very rare mineral duranusite from the type locality (L'Eguisse Mine, Duranus, Provence-Alpes-Cote d'Azur, France), associated to realgar. Duranusite is a arsenic sulphide of rare composition As4S. Mineral

Duranusite

duranusite

Formula
As4S
Blue crystals aggregates of the very rare mineral dusmatovite from the type and only known locality worldwide: Dara-i-Pioz Glacier, Tien Shan Mountains, Region of Republican Subordination, Tajikistan. Ex Vandenbroucke Museum collection specimen, from Waregem, Belgium. Mineral

Dusmatovite

dusmatovite

Formula
K(Na,☐)2(Zn,Li)3(Mn²⁺,Y,Zr)2[Si12O30]
Mohs
4.5
Dussertite Locality: Djebel Debar, Hamman, Meskhootine, Constantine Province, Algeria (Locality at mindat.org) Green crystals of Dussertite from the TL. Field of view 4 mm. Specimen and photo Leon Hupperichs. Mineral

Dussertite

dussertite

Formula
BaFe³⁺3(AsO4)(AsO3OH)(OH)6
Mineral

Dutkevichite-(Ce)

dutkevichite-(Ce)
Photomicrograph of dutrowite in plane-polarized light. Symbols after Warr (2021): Ap – “apatite”; Bt – “biotite”; Dtw – dutrowite; Kfs – K-feldspar; Odrv – oxy-dravite; Qz – quartz. “Biotite” is partially altered in “chlorite” and rutile, whereas K-feldspar is sericitized. Red box corresponds to the area where the grain used for single-crystal X-ray diffraction was extracted. Type material. Catalogue number 19890, Museo di Storia Naturale, Università di Pisa. The image is published in an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). Mineral

Dutrowite

dutrowite
Duttonite Locality: Mounana Mine (Mouana Mine), Franceville, Haut-Ogooué Province, Gabon (Locality at mindat.org) Size: 4.3 x 1.7 x 1.0 cm. Duttonite is a very rare vanadium hydroxide. Ex. Rice Northwest Museum and A.L. McGuiness Collections. Mineral

Duttonite

duttonite

Formula
V⁴⁺O(OH)2
Outstanding specimen of the extremely rare mineral dwornikite from one of the only three known localities worldwide: Lipovskoe Deposit, Rezh District, Urals Region, Russian Federation. The mineral occurs as sharp yellow-greenish acicular crystals covering a great part of the matrix. Mineral

Dwornikite

dwornikite

Formula
Ni(SO4)·H2O
Colour
white
Mineral

Dymkovite

dymkovite

Formula
Ni(UO2)2(As³⁺O3)2·7H2O
:Estéticos y brillantes agregados de cristales foliáceos, formando rosetas, de intenso color blanco, aunque son incoloros, de dypingita. Se acompañan de gavillas de cristales aplanados de hidromagnesita, entre translúcidos a transparentes, incoloros (recuerdan al aragonito). Todos ellos se disponen sobre una matriz de roca recubierta de una capa con formas botroidales, de color azul a gris, de brucita. Una pieza catalana de las que hoy día cuesta encontrar, con especies poco habituales y con calidad. From: Pedrera de l'Àngel, Montseny massif, Gualba, Barcelona, Catalunya, España Medidas: 8.5 x 7.0 x 6.0 cm. Encontrado en 1970's. Ex. L. Daunis (Barcelona) Ejemplar con análisis Mineral

Dypingite

dypingite

Formula
Mg5(CO3)4(OH)2·5H2O
Mineral

Dyrnaesite-(La)

dyrnaesite-(La)

Formula
Na8Ce⁴⁺(La,REE)2(PO4)6
Dyscrasite Locality: Uranium Mine No. 21, Příbram, Central Bohemia Region, Bohemia (Böhmen; Boehmen), Czech Republic (Locality at mindat.org) An excellent cluster of lustrous, twinned dyscrasite crystals with matrix. Some of the crystals reach 2.5 cm, and the twins to almost 2 cm. Although this is an old location from which dyscrasite was known a long time ago, many specimens on the market come from a few small pockets found in the 1980s. Most of these important specimens came out rather clunky, or so jumbly the crystals had little individual definition in context, but this miniature stands out amongst nearly all I have seen for the overall aesthetics and quality as well. 4.5 x 4.5 x 3.3 cm Mineral

Dyscrasite

dyscrasite

Formula
Ag3+ₓSb1-ₓ (x~0.2)
Pale tan crystal aggregates of the extremely rare indium mineral dzhalindite associated to metallic minoritary also indium mineral indite from the type locality for both minerals: Dzhalinda, Malyi Khingan Range, Khabarovsk Krai, Russian Federation. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Dzhalindite

dzhalindite

Formula
In(OH)3
Several very very small single crystals of the very rare mineral selenium mineral dzharkenite (FeSe2) from the type locality: Suluchekinskoye Se-U Deposit, Dzharkenskaya, Almaty Province, Kazakhstan. Mineral

Dzharkenite

dzharkenite

Formula
FeSe2
Mohs
5