Mineral Specimen Images (G)

Graeserite: (Fe+++,Ti)4Ti3AsO13(OH)

Comments: SEM photomicrograph of an aggregate of hair-like graeserite crystals. CanMin v36:1083.
Location: Monte Leone Nappe, Binntal region, Western Alps, Switzerland. Scale: Scale Bar 1 mm.
© Canadian Mineralogist

Graftonite: (Fe++,Mn,Ca)3(PO4)2  
Heterosite: Fe+++PO4

Comments: Whitish graftonite intergrown with dark purple to brown heterosite.
Location: Grafton, Grafton County, New Hampshire, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Gramaccioliite-(Y): (Pb,Sr)(Y,Mn)Fe2(Ti,Fe)18O38

Comments: Black, metallic rystals of gramaccioliite-(Y) in matrix.
Location: Sambuco, Pianche di Vinazio, Piemont, Italy. Scale: Picture size 1.3 mm..
© Thomas Witzke

Grandidierite: (Mg,Fe++)Al3(BO4)(SiO4)O

Comments: Translucent blue-green crystalline grandidierite in pegmatite.
Location: Vohibola, Madagascar. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Grandidierite: (Mg,Fe++)Al3(BO4)(SiO4)O  
Boralsilite: Al16B6Si2O27

Comments: B&W PPL image of aggregates of boralsilite in quartz near grandidierite. Pyrite is partially replaced by oxide. Abbrev: A+B = Secondary andalusite, B = boralsilite, G = grandidierite, P = pyrite, Q = quartz. (AmMin v93:294).
Location: Pegmatites from the Larsemann Hills, East Antarctica. Scale: See Image.
© American Mineralogist

Grandviewite: Cu3Al9(SO4)2(OH)29

Comments: Light blue sprays of fibrous grandviewite crystals associated with blue cyanotrichite.
Location: Grand View mine, Coconino County, Arizona, USA. Scale: See Image.
© George Stevens, Malcom Alter/RRUFF

Grantsite: Na4CaxV++++2xV+++++12-2xO32·8(H2O)  
Tyuyamunite: Ca(UO2)2V2O8·5-8(H2O)

Comments: Dark olive green waxy coatings of grantsite with greenish-yellow tyuyamunite and sandstone.
Location: F-33 Mine, near Grants, Valencia County, New Mexico, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Graphite: C

Comments: A crystal of graphite in gneiss.
Location: Forchheim, Pockau, Erzgebirge, Saxony, Germany. Scale: Picture size 6 mm.
© Thomas Witzke / Abraxas-Verlag

Graphite: C

Comments: Black, sub-hexagonal crystal of graphite in calcite.
Location: Lead Hill Mine, (near Ticonderoga), Essex Co., New York, USA. Scale: Crystal size 1 mm.
© Paul M. Schumacher

Gratonite: Pb9As4S15

Comments: Crystal cluster of gratonite. The largest crystal is 2.5 mm across.
Location: Excelsior mine, Cerro de Pasco, Pasco dept., Peru. Scale: 1.5 x 1 cm.
© John Veevaert

Grattarolaite: Fe+++3O3(PO4)  
Rodolicoite: Fe+++PO4

Comments: Brown grattarolaite, intimately intergrown with brown rodolicoite.
Location: Castelnuovo Mine, Santa Barbara lignite district, San Giovanni Valdarno, Valdarno (Val d'Arno), Arezzo Province, Tuscany, Italy. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Graulichite-(Ce): CeFe+++3(AsO4)2(OH)6

Comments: Scanning electron microscope image of rhombohedral graulichite-(Ce) crystals on goethite.
Location: Hourt quarry, Stavelot Massif, Belgian Ardennes. Scale: See Image.
© University de Liege

Gravegliaite: Mn++(SO3)·3(H2O)

Comments: Pale brownish prismatic crystals of gravegliaite on matrix.
Location: Gambatesa Mine, Val Graveglia, Genova, Liguria, Italy. Scale: Picture Size 1 mm.
© Thomas Witzke

Grechishchevite: Hg3S2(Br,Cl,I)2

Comments: Red grechishchevite coatings on calcite.
Location: Kadyrel' Hg occurrence, Oorash-Khem River Valley, Uyuk Range, Pii-Khem District, Tuva Republic, Eastern-Siberian Region, Russia. Scale: Picture Size 2 mm.
© Jeff Weissman / Photographic Guide to Mineral Species

Greenalite: (Fe++,Fe+++)2-3Si2O5(OH)4

Comments: Dark olive-green massive greenalite with metallic galena.
Location: La Union Mine, Murcia, Spain. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Greenockite: CdS

Comments: Brown, equant crystal of greenockite on prehnite.
Location: Summit, Union County, New Jersey, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Gregoryite: (Na2,K2,Ca)CO3  
Nyerereite: Na2Ca(CO3)2

Comments: Sodium (nyereteite) and potassium (gregoryite) carbonates, not stable in normal atmosphere, collected molten from the volcano and maintained in inert argon atmosphere.
Location: Ol Doinyo Lengai Vulkan, Maasai Steppe, East Africa Rift Valley, Tanzania. See Link. Scale: Rock size 2 cm.
© Richard Dale / Dale Minerals

Greifensteinite: Ca2Be4(Fe++,Mn)5(PO4)6(OH)4·6(H2O)

Comments: Tabular crystal of greifensteinite impaled on acicular tourmaline.
Location: Greifenstein Rocks, Ehrenfriedersdorf, Erzgebirge, Saxony, Germany. Scale: Picture size 1 mm.
© Thomas Witzke / Abraxas-Verlag

Greigite: Fe++Fe+++2S4

Comments: Radiating needles are colloidal greigite with plates of sulfur.
Location: Synthetic material. Scale: See Image.
© Electron Optics Image Gallery / University of Leeds

Griceite: LiF  
Villiaumite: NaF

Comments: White aggregates of griceite with pinkish villiaumite.
Location: Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry), Mt Saint-Hilaire, Rouville Co., Québec, Canada. Scale: Picture size 3.5 mm.
© Thomas Witzke / Abraxas-Verlag