Material Index for the Spectroscopy Database

Material Index

Name	Formula	Classifications	Members	Image	Lines	Spectra	Techniques	Tags
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	14	1	EDS	Aluminosilicate , Variety
Olivine	(Mg,Fe^II)₂SiO₄	Nesosilicate	Liebenbergite, Tephroite, Glaucochroite, Kirschsteinite, Laihunite, Peridot, Calcio-olivine, Forsterite, Monticellite, Fayalite	Olivine Forsterite (var. peridot) olivine from St John's Island (Zagbargad), Red Sea, Egypt © Rob Lavinsky, iRocks.com – CC-BY-SA-3.0	3	0	Reflectance	Group , Silicate
Olympite	LiNa₅(PO₄)₂	Minerals containing PO4	—		1	0	PL	Mineral, Phosphate , Orthophosphate
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	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	10	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	16	1	SXES	Mineral , Metal , Element
Otavite	CdCO₃	Calcite (group), Minerals containing CO3	—	Otavite Otavide crystals (white), from Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia © Photo by Christian Rewitzer (via Wikimedia Commons), CC-BY-SA 3.0	1	0	Unknown	Carbonate , Mineral
Pabstite	BaSnSi₃O₉	Benitoite (group)	—	Pabstite Tan crystal aggregates of pabstite, from Pacific Cement Quarry, Santa Cruz, CA, USA. Ex. F. Bauer collection © Photo (C) 2020 David Hospital (via Wikimedia Commons), CC-BY-SA 4.0	1	0	PL/UV	Mineral, Silicate
Palladium	Pd	—	—	Palladium Elemental palladium © (C) 2024 James St. John (via Wikimedia Commons). CC-BY-2.0	11	3	SXES	Mineral , Metal , Element
Palygorskite	(Mg,Al)₂Si₄O₁₀(OH)·4H₂O	Palygorskite (group), Minerals containing H2O, Minerals containing OH	—	Palygorskite Palygorskite, from Attapulgus, Decatur Co., Georgia, USA © Photo by Ken Larsen, Smithsonian Institution. CC0	1	0	Reflectance	Hydroxide , Mineral, Hydrated , Aluminosilicate
Paragonite	NaAl₂(Si₃Al)O₁₀(OH)₂	Mica, Minerals containing OH	Paragonite-2M1	Paragonite Paragonite with garnet © Photo by Dave Dyet (via Wikimedia Commons). Public domain.	4	1	Reflectance	Hydroxide , Mineral, Aluminosilicate
Parakeldyshite	Na₂ZrSi₂O₇	—	—	Parakeldyshite White crystals of the rare mineral parakeldyshite from Bratthagen Quarries, Lågendalen, Hedrum, Larvik, Vestfold, Norway © Photo by David Hospital (via Wikimedia Commons), CC-BY-SA 4.0	3	0	PL, PL/XL	Mineral, Silicate
Parauranophane	Ca(UO₂)₂(SiO₃OH)₂·5H₂O	Minerals containing H2O, Minerals containing OH, Uranophane (group)	—	Parauranophane Uranophane-alpha (light yellow radiating spheres) and Uranophane-beta (dark yellow, fan-like, thick needles) on Granite from Miedzianka in Krkonoše near Janowice Wielkie in Poland (Width: 11.5 mm) © Photo by F. Rohowski (via Wikimedia Commons), CC-BY-SA 3.0	4	0	PL	Hydroxide , Mineral, Silicate , Uranyl , Hydrated
Parsonsite	Pb₂(UO₂)(PO₄)₂	Minerals containing PO4	—	Parsonsite Specimen of parsonsite (brown) and torbernite (green), from Pinhal do Souto mine, Tragos, Chãs de Tavares, Mangualde, Viseu District, Portugal. Field of view is 4mm. © Photo by Leon Hupperichs (via Wikimedia Commons), CC-BY-SA 3.0	6	0	PL	Mineral, Orthophosphate , Phosphate , Uranyl , Hydrated
Pectolite	NaCa₂Si₃O₈(OH)	Wollastonite (group), Pyroxenoid, Minerals containing OH	—	Pectolite Pale greenish radiating spherical aggregates of Pectolite measuring up to 1.3 cm across, from Millington Quarry, Bernards Township, Somerset County, New Jersey, USA © Rob Lavinsky, iRocks.com – CC-BY-SA-3.0	2	0	PL/Laser	Mineral, Silicate , Hydroxide