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Minerals

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Blue burangaite crystals associated to white gatumbaite from the type locality for both minerals: Buranga Pegmatite, Gatumba, Ngororero District, Western Province, Rwanda. Associated mineral after the label is brazilianite but this species could not be identified in the specimen. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Gatumbaite

gatumbaite

Formula
CaAl2(PO4)2(OH)2·H2O
Gaudefroyite Locality: Wessels Mine (Wessel's Mine), Hotazel, Kalahari manganese fields, Northern Cape Province, South Africa (Locality at mindat.org) Size: 1.8 x 1.3 x 1.2 cm. A superb cluster of very lustrous Gaudefroyite crystals, some of the best I have ever seen in terms of sharpness and arrangement in thumbnail size. The largest of the well-formed crystals is a full 1 cm tall, and several of the crystals in the cluster are doubly-terminated. It is a full-sized thumbnail, overall. Ex. Charlie Key. Mineral

Gaudefroyite

gaudefroyite

Mohs
6
Mineral

Gaultite

gaultite

Formula
Na4Zn2Si7O18·5H2O
Yellow orange sharp crystals of the very rare uranium mineral gauthierite (IMA 2016-004) named in honour of the famous Gilbert Gauthier, expert on uranium minerals from Katanga. Analyzed specimen by SEM-EDS and XRD. From: Shinkolobwe Mine, Shinkolobwe, Kambove, Haut-Katanga, DR Congo. Mineral

Gauthierite

gauthierite

Formula
KPb[(UO2)7O5(OH)7]·8H2O
Outstanding brown crystals of the very rare phosphate mineral gayite associated to white morinite from Portugal (Assunção Mine, Aldeia Nova, Sátão, Viseu District, Portugal). Ex. Erich Laskowski collection (USA). Mineral

Gayite

gayite

Formula
NaMnFe5(PO4)4(OH)6·2H2O
Gaylussite Locality: Lake Amboseli, Rift Valley Province, Kenya (Locality at mindat.org) Size: 3.1 x 1.5 x 1.4 cm Gaylussite is chemically a fairly simple carbonate mineral, but is not commonly found around the world. The crystals are typically grey, colorless or whitish in appearance, and can be quite gemmy from certain localities. This doubly-terminated, rather gemmy, sharp, well-formed, colorless to brownish crystal is an excellent example of the species. One of the few I have handled, and certainly one of the best single "floater" crystals I have seen. Ex. Richard Kosnar Collection. Mineral

Gaylussite

gaylussite

Formula
Na2Ca(CO3)2·5H2O
Mineral

Gazeevite

gazeevite

Formula
BaCa6(SiO4)2(SO4)2O
White powdery gearksutite with blue-green amazonite, lavender prosopite and black tantalite-(Mn). Pinkish color is due to Mn inclusions in altered prosopite. From the weather aluminum-fluoride zone, 32' level NE. Collector (Oct. 2004) & owner MWylie Mineral

Gearksutite

gearksutite

Formula
CaAlF4(OH)·H2O
Mineral

Gebhardite

gebhardite

Formula
Pb8(As2O5)2OCl6
Gedrite, Magnetite Dimensions: 50mm x 30mm Locality: Beaver Meadow Road - State Route 9 Interchange, Haddam, Middlesex Co., Connecticut, USA Description: The crystal mass seen here is gedrite. The feldspar matrix contains enough grains of magnetite to make the whole specimen magnetic. (Note the magnet hanging on the back.) Mineral

Gedrite

gedrite

Formula
☐Mg2Mg3Al2(Si6Al2)O22(OH)2
Geerite Field of view: 3 mm Locality: Clara Mine, Oberwolfach, Ortenaukreis, Freiburg Region, Baden-Württemberg, Germany Mineral

Geerite

geerite

Formula
Cu8S5
Silvery metallic crystal aggregates of the very rare Cu-Fe-Ag selenide geffroyite from the famous Moctezuma mine in Mexico famous for its Te minerals. Curiously this one is not a telluride but a selenide. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Geffroyite

geffroyite

Formula
(Cu,Fe,Ag)9(Se,S)8
Gehlenite Locality: Monzoni Mts, Fassa Valley, Trento Province, Trentino-Alto Adige, Italy (Locality at mindat.org) Size: miniature, 4.3 x 3.7 x 2.2 cm Gehlenite A nice miniature featuring sharp crystals of gehlenite to 6mm, from the type locality for this calcium aluminosilicate species. Ex. John White Collection. Mineral

Gehlenite

gehlenite

Formula
Ca2Al(SiAl)O7
Mineral

Geigerite

geigerite

Formula
Mn²⁺5(AsO4)2(HAsO4)2·10H2O
Geikielite Locality: Maxwell quarry, Chelsea, Les Collines-de-l'Outaouais RCM, Outaouais, Québec, Canada (Locality at mindat.org) Size: 7.5 x 6 x 4 cm. Geikielite is a rare magnesium titanium oxide, found usually in microcrystals or masses. It is the magnesium analogue of Ilmenite. Here we have a huge mass of geikielite about 3 inches in size with distinct big crystals over 1 cm in size embedded within it. It shows metallic lustre and some sharp twinning. This has been confirmed via communications with several collectors of rarities and the Royal Ontario Museum. Ex. Philadelphia Academy of Sciences Collection. Mineral

Geikielite

geikielite

Formula
MgTiO3
Mineral

Gelosaite

gelosaite

Formula
BiMo⁶⁺2-5ₓMo⁵⁺6ₓO7(OH)·H2O (0 < x < 0.4)
Sky blue crystals of the rare arsenate mineral geminite from the TL in Cap Garonne (Cap Garonne Mine, Le Pradet, Var, Provence-Alpes-Cote d'Azur, France). Ex Vandenbroucke Museum collection from Waregem, Belgium Mineral

Geminite

geminite

Formula
Cu(HAsO4)·H2O
Mineral

Gengenbachite

gengenbachite

Formula
KFe3(H2PO4)2(HPO4)4·6H2O
Microinclusions of the extremely rare Pt-Sb mineral genkinite in a nugget of isoferroplatinum in an analyzed specimen by SEM/EDS, from the type locality in Southafrica: Onverwacht Mine, Steelpoort, Sekhukhune District, Limpopo Province, South Africa. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Genkinite

genkinite

Formula
Pt4Sb3
Mineral

Genplesite

genplesite

Formula
Ca3Sn(SO4)2(OH)6·3H2O
Genthelvite Locality: Huanggang Fe-Sn deposit (Huanggangliang Mine; Huanggang Mine), Hexigten Banner (Keshiketeng Co.), Ulanhad League (Chifeng Prefecture), Inner Mongolia Autonomous Region, China Original description: Small cluster of lustrous pink/brown genthelvite crystals, 18 x 18 x 14 mm. K. Nash specimen and photo. Mineral

Genthelvite

genthelvite

Formula
Be3Zn4(SiO4)3S
Geocronite Locality: Pollone mine, Valdicastello Carducci, Pietrasanta, Apuan Alps, Lucca Province, Tuscany, Italy (Locality at mindat.org) Size: 2.7 x 2.4 x 1.3 cm. This is a VERY rare lead sufosalt with moderately large crystals. The color is battleship gray, with a satiny luster. The crystals are foliated in parallel growth, much like mica. This species is not often seen in dealers stocks or even in museums. I am told it was collected prior to 1840. Mineral

Geocronite

geocronite

Formula
Pb14(Sb,As)6S23
Mohs
2.5
:Locality: Petrelius River, Khibiny, Kola, Russian Federation Size: 0.14 × 0.08 × 0.05 cm Description: A small translucent crystalline fragment from the type locality (TL) of this extremely rare species. This fragment is part of the holotype. Georgbarsanovite is a very rare mineral of the eudialyte group, formerly known under unaccepted name as barsanovite. Barsanovite, described in 1963 as а monoclinic dimorph of trigonal eudialyte, was discredited in 1969 bесаuse its assignment to the monoclinic system had been proved to bе erroneous. Revision study of the barsanovite type specimen carried out with use of the X-ray single crystal analysis has shown that the mineral is trigonal and has а distinct combination of cations and anions in the key sites of the crystal structure. The mineral was revalidated in 2003 as georgbarsanovite given as before after prof. Georgiy Pavlovich Barsanov (1907-1991). [rruff] IMA2003-013 - Discredited monoclinic Barsanovite to trigonal. IMA2007-008 - Determined trigonal structure of georgbarsanovite. Type Locality: Nepheline pegmatite outcrop, Petrelius River, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Mineral

Georgbarsanovite

georgbarsanovite

Formula
Na12(Mn,Sr,REE)3Ca6Fe²⁺3Zr3NbSi25O76Cl2·H2O
Mineral

Georgbokiite

georgbokiite

Formula
Cu5(SeO3)2O2Cl2
Colour
dark brown