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Mineral

Gadolinite-(Nd)

gadolinite-(Nd)

Formula
Nd2Fe²⁺Be2O2(SiO4)2
Gadolinite-(Y) Locality: Ytterby, Resarö, Vaxholm, Uppland, Sweden (Locality at mindat.org) Size: 2.3 x 2.2 x 2.0 cm. Gadolinite is a rare yttrium, beryllium silicate found in granites and alkalic granitic pegmatites. This old-time, lustrous, waxy, partially euhedral crystal is from the Type Locality in Sweden - Ytterby, Uppland. This classic piece comes with 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. Mineral

Gadolinite-(Y)

gadolinite-(Y)

Formula
Y2Fe²⁺Be2Si2O10
Mineral

Gagarinite-(Ce)

gagarinite-(Ce)

Formula
NaCaCeF6
:Locality: Katugin, Chitinskaya Oblast', Transbaikalia, Eastern Siberia, Russian Federation Size: 1.4 × 1.1 × 0.7 cm Description: Brick-red sample of gagarinite-(Y), showing crystalline shape, embeded in cryolite and sugar fluoraluminates like thomsenolite or gearksutite. Mineral

Gagarinite-(Y)

gagarinite-(Y)

Formula
NaCaYF6
Gageite Locality: N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa (Locality at mindat.org) Greyish-white fibrous Gageite on Rhodochrosite. Field of view 7 mm. Specimen and photo Leon Hupperichs. Mineral

Gageite

gageite
Gahnite, Spinel Locality: Amity, Town of Warwick, Orange County, New York, USA (Locality at mindat.org) Size: thumbnail, 3 x 2.8 x 2.5 cm Spinel (Gahnite) Very sharp, and nearly complete, set of Gahnite crystals. The luster is very good, and the largest crystal is 1.9 cm on edge. A truly superb specimen for the species and historic locality. It has old red ink catalogue numbering on one rear face. Mineral

Gahnite

gahnite

Formula
ZnAl2O4
:A good example of gaidonnayite from MSH. It has relatively simple twinning with recognizable morphology and is of decent size. Unlike most gaidonnayite at MSH, this is from a brecciated hornfels rather than a pegmatite. Also unlike most gaidonnayite,it has only very weak fluorescence. The color is medium gray - perhaps due to inclusions of pyrite - with a blueish tint. From: Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada. FOV 3.1 x 2.3 mm. Found April 1997. MOB coll. Mineral

Gaidonnayite

gaidonnayite

Formula
Na2Zr(Si3O9)·2H2O
Mineral

Gaildunningite

gaildunningite

Formula
Hg²⁺3[NHg²⁺2]18(Cl,I,OH,Br,S)24
Pale purple single crystal of the extremely rare mineral gainesite from the type and only known locality worldwide: Nevel Quarry, Newry, Oxford County, Maine, United States of America. Ex Vandenbroucke Museum collection specimen, from Waregem, Belgium. Mineral

Gainesite

gainesite

Formula
Na2(Be,Li)Zr2(PO4)4·1.5H2O
Outstanding white platy crystals of the extremely rare mineral gaitite from a locality in Mexico (Pitiquito Municipality, Sonora, Mexico). Gaitite is a Ca-Zn arsenate. Ex Vandenbroucke Museum collection specimen, from Waregem, Belgium. Mineral

Gaitite

gaitite

Formula
Ca2Zn(AsO4)2·2H2O
Mineral

Gajardoite

gajardoite

Formula
KCa0.5As³⁺4O6Cl2(H2O)3·2H2O
Colour
colorlessness
White aggregates mainly composed of gajardoite-(NH 4 ) on the skutterudite-safflorite matrix. Holotype sample. Field of view of 2 × 2 mm. Photo by Maria D. Milshina. Mineral

Gajardoite-(Nh₄)

gajardoite-(NH₄)

Formula
(NH4)As³⁺4O6Cl2(Ca0,5◻0,5)(H2O)5
Galaxite, Jacobsite, Wiserite Dimensions: 11.6 cm x 7.3 cm x 2.0 cm Locality: Kaso Mine, Kanuma City, Tochigi Prefecture, Kanto Region, Honshu Island, Japan An incredibly rare specimen of the Spinel Group species galaxite from the Kaso Mine in Japan. In addition to the rare galaxite, both jacobsite and wiserite are present. This piece is a polished specimen which shows brown-red galaxite with semi-metallic black-grey jacobsite and minor tan wiserite. It is accompanied by a classic label from Josef Vajdák/Pequa Rare Minerals. Mineral

Galaxite

galaxite

Formula
Mn²⁺Al2O4
Mohs
7.5
Mineral

Galeaclolusite

galeaclolusite

Formula
Al6(AsO4)3(OH)9(H2O)4·8H2O
Yellow-orange powder in a capsule of the rare sulphate chloride-fluoride mineral galeite from the type locality in Searles Lake (Searles Lake, San Bernardino County, California, United States of America) and only one of the three known localities worldwide. Ex Vandenbroucke Museum collection specimen, from Waregem, Belgium. Mineral

Galeite

galeite

Formula
Na15(SO4)5F4Cl
Freiberg, Terra mineralia, pyrrhotite, galena, quartz, location: Dalnegorsk, Siberia Mineral

Galena

Formula
PbS
Mohs
2.5
Colour
Lead-grey
Galenobismutite - Vulcano Island, Italy - Exposed in the Mineralogical Museum, Bonn, Germany Mineral

Galenobismutite

galenobismutite

Formula
PbBi2S4
Mineral

Galgenbergite-(Ce)

galgenbergite-(Ce)

Formula
CaCe2(CO3)4·H2O
Mineral

Galileiite

galileiite

Formula
NaFe²⁺4(PO4)3
Galkhaite Locality: Getchell Mine, Adam Peak, Potosi District, Humboldt County, Nevada, USA (Locality at mindat.org) Size: 4.2 x 4.1 x 1.8 cm. A SUPERB miniature of lustrous, gemmy to opaque, dark blood-red galkhaite crystals to 3 mm RICHLY scattered on matrix from the famous Getchell Mine of Nevada from small finds in the late 1970s stashed until recent years by the mine geologist. Galkhaite is a ULTRA-RARE cesium, thallium, mercury sulfosalt and this is an OUTSTANDING example. SELDOM do you see galkhaite specimens with this many gemmy crystals! Mineral

Galkhaite

galkhaite

Formula
(Hg5Cu)CsAs4S12
Mineral

Galliskiite

galliskiite

Formula
Ca4Al2(PO4)2F8·5H2O
Gallite Locality: Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto (Oshikoto) Region, Namibia (Locality at mindat.org) Size: 3.9 x 2.8 x 1.2 cm. Gallite is a very rare copper, gallium sulfide and is one of the rare mineral species for which Tsumeb is renowned. Sparkly, gray microcrystals of gallite with a lilac tinge are scattered on the matrix of germanite and renierite. Gallite and germanite have a similar color. This rich ore specimen definitely has a rainbow of iridescent rare species. This specimen was formerly in the collection of John White of Seattle, a noted systematic rarities collector. John was a friend of analyzer-of-rare-species Bart Cannon, who could X-ray any questionable mineral specimens and often did so for him, or sold them to him in the first place. So, the identification of this specimen having gallite in it, is certainly correct. Bart Cannon is in fact selling the collection, so it came back through him, as well. Mineral

Gallite

gallite

Formula
CuGaS2
Mineral

Gallobeudantite

gallobeudantite

Formula
PbGa3(AsO4)(SO4)(OH)6
Mohs
4
White crystals of the extremely rare Gallium-Germanium mineral galloplumbogummite (IMA 2010-088) from Tsumeb, the type and the only known locality worldwide. The specimen has a lot of microcrystals of white galloplumbogummite, associated to minoritary cleavages of silvery metallic gallite (another gallium mineral). Analyzed specimen, Galloplumbogummite is one of the great rarities of Tsumeb, and one the most sought after species from the locality. Only two of 5500 known minerals have at the same time Gallium and Germanium in its chemical composition, this one is one of the two (the other, krieselite, also from Tsumeb). Mineral

Galloplumbogummite

galloplumbogummite

Formula
Pb(Ga,Al,Ge)3(PO4)2(OH)6