Material Index for the Spectroscopy Database

Material Index

Name	Formula	Classifications	Members	Image	Specimens	Lines	Spectra	Techniques	Tags
Oldhamite	(Ca,Mg,Fe)S	Galena (group)	—	Oldhamite Dark grey grains, masses and tiny veins of oldhamite in calcite, from Lichtenberg Absetzer Mine (dump), Ronneburg U deposit, Gera, Thuringia, Germany. Ex Fritz Rüger collection. Field of view 1.5 cm. Photo by Leon Hupperichs (via Wikimedia Commons), CC-BY-SA 3.0	0	2	0	CL/OM	Mineral, Sulphide
Olgite	(Ba,Sr)(Na,Sr,REE)₂Na(PO₄)₂	Minerals containing PO4	—	Olgite Very dark green crystals of the rare phosphate mineral olgite from the type locality in Karnasurt Mountain, Lovozero Massif, Kola Peninsula, Russian Federation Photo by David Hospital (via Wikimedia Commons), CC-BY-SA 4.0	0	3	0	PL, PL/XL	Mineral, Phosphate , Orthophosphate
Oligoclase	(Na,Ca)(Si,Al)₄O₈	Plagioclase	—	Oligoclase Photograph of Oligoclase (var. sunstone, NMNH G3273) from the National Gem Collection, showing golden sheen. Specimen from Tvedestrand, Aust-Agder, Norway Photo by Chip Clark, via Smithsonian National Museum of Natural History	4	14	1	EDS	Aluminosilicate , Variety
Olivine	(Mg,Fe^II)₂SiO₄	Nesosilicate	Calcio-olivine, Forsterite, Fayalite, Liebenbergite, Monticellite, Peridot, Laihunite, Tephroite, Glaucochroite, Kirschsteinite	Olivine Forsterite (var. peridot) olivine from St John's Island (Zagbargad), Red Sea, Egypt Rob Lavinsky, iRocks.com – CC-BY-SA-3.0	1	3	0	Reflectance	Group , Silicate
Olympite	LiNa₅(PO₄)₂	Minerals containing PO4	—		0	1	0	PL	Mineral, Phosphate , Orthophosphate
Omphacite	(Ca,Na)(Mg,Fe,Al)Si₂O₆	Clinopyroxene	—		1	0	0	—	Mineral
Opal	SiO₂·nH₂O	Minerals containing H2O	—	Opal Dark Jubilee Opal specimen (318.44ct) from Coober Pedy, South Australia, Australia Photo by Chip Clark, via Smithsonian National Museum of Natural History	1	19	1	CL	Mineral, Hydrated
Orthoclase	KAlSi₃O₈	K feldspar	—	Orthoclase Orthoclase specimen (27x17cm), from Minas Gerais, Southeast Region, Brazil Photo by Didier Descouens (via Wikimedia Commons), CC-BY-SA 4.0	17	11	1	CL	Mineral, Aluminosilicate
Osmium	Os	—	—	Osmium Cluster of osmium crystals grown by chemical vapor transport Image courtesy www.periodictable.ru, via Wikimedia Commons. CC-BY-3.0	1	16	1	SXES	Mineral , Metal , Element
Otavite	CdCO₃	Minerals containing CO3, Calcite (group)	—	Otavite Otavide crystals (white), from Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia Photo by Christian Rewitzer (via Wikimedia Commons), CC-BY-SA 3.0	0	1	0	Unknown	Carbonate , Mineral