Material Index for the Spectroscopy Database

Material Index

Name	Formula	Classifications	Members	Image	Lines	Spectra	Techniques	Tags
Gibbsite	Al(OH)₃	Minerals containing OH	—	Gibbsite Botryoidal aggregates of greenish-gray gibbsite, to 0.3 cm across. From Xianghualing Mine, Xianghualing Sn-polymetallic ore field, Linwu County, Chenzhou Prefecture, Hunan Province, China © (C) Rob Lavinsky, iRocks.com – CC-BY-SA-3.0	11	0	IR, PL, Reflectance	Mineral, Hydroxide
Glass	, SiO₂	REE glass	Melt, Tachylite	Glass 1st century CE Julio-Claudian roman glass cup, signed by Ennion. © Public Domain image courtesy of The Metropolitan Museum of Art, New York, USA.	87	15	CL, CL/SEM	—
Glauberite	Na₂Ca(SO₄)₂	Minerals containing SO4	—		1	0	PL	Mineral, Sulphate
Glauconite	(K,Na)(Fe^III,Al,Mg)₂(Si,Al)₄O₁₀(OH)₂	Mica	—		2	0	PL, PL/XL	Hydroxide , Mineral, Aluminosilicate , Informal
Goethite	FeO(OH)	Minerals containing OH, Diaspore (group), Iron oxide/hydroxide	—	Goethite Botryoidal Goethite from Siegerland, Germany. Gallery of Mineralogy and Geology of the French National Museum of Natural History in Paris. © Photo by Marie-Lan Taÿ Pamart (via Wikimedia Commons), CC-BY 4.0	10	0	IR, Reflectance	Mineral, Hydroxide
Gold	Au	—	—	Gold The Bunyip gold nugget, from Loddon River flood plain, near Bridgewater, Victoria, Australia. Weight: 1.55 kilograms (50 ounces). Specimen M 34546, Museums Victoria © Photo by Frank Coffa, Copyright Museums Victoria / CC BY (Licensed as Attribution 4.0 International)	17	3	SXES, TL	Mineral , Metal , Element
Graphite	C	Carbon	—	Graphite A specimen of graphite © Image courtesy of the US Geological Survey. Public domain.	0	2	SXES	Mineral
Greenockite	CdS	Cadmium sulphide, Wurtzite (group)	—	Greenockite Specimen of Greenockite (CdS) on Calcite (CaCO3), from Joplin, Jasper Co., Missouri, USA © Photo by Ken Larsen, Smithsonian Institution, CC0	2	0	IR, PL	Mineral, Sulphide
Grossular	Ca₃Al₂(SiO₄)₃	Minerals containing SiO4, Andradite-Grossular (series), Garnet	Hydrogrossular	Grossular Specimen of grossular, from Khalola hill near Sassi, Gilgit- Baltistan, Pakistan. Specimen M 38031, Museums Victoria. © Photo by John Bosworth, Copyright Museums Victoria / CC BY (Licensed as Attribution 4.0 International)	2	3	CL, EDS	Mineral, Aluminosilicate
Grunerite	☐Fe^II₂Fe^II₅Si₈O₂₂(OH)₂	Minerals containing OH, Cummingtonite-Grunerite (series), Mg-Fe-Mn amphibole	Amosite	Grunerite Spray of crystals Grunerite on matrix; Photo and collection Fernando Brederodes. From Michigamme Mine, Marquette Co., Michigan, USA © (C) 2014 Fernando Brederodes (via Wikimedia Commons). Public Domain.	2	0	Reflectance	Hydroxide , Mineral, Silicate
Gypsum	Ca(SO₄)·2H₂O	Gypsum (supergroup), Calcium sulphate, Minerals containing SO4, Minerals containing H2O	Selenite	Gypsum Image of a specimen of gypsum (M 47268, Museums Victoria), from Selwyn, Queensland, Australia © Photograph by John Broomfield, Museums Victoria, CC-BY	27	0	IR, PL, Raman, Reflectance	Mineral, Sulphate , Hydrated