Granite
Granite
igneous
Category
Mineral (Silicate Variety)
Browse mineral (silicate variety) specimens identified by the Rock Identifier community.
Learn about Mineral (Silicate Variety) in the encyclopedia
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Petrified Wood
Silicified Wood (SiO2)
fossil
Muscovite mica (mica schist fragment)
Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂; possibly intergrown with quartz and feldspar
mineral
Rhodonite
Rhodonite (Mn,Fe,Mg,Ca)SiO3
mineral
Chrysocolla in Matrix
Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)
mineral
Granite
Intrusive Igneous Rock
igneous
Amazonite
K(AlSi3O8) - Potassium Aluminum Silicate
mineral
Chrysocolla
Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)
mineral
Polished serpentine
Serpentinite; chiefly antigorite, lizardite, or chrysotile-group minerals
metamorphic
Green Jasper / Chert
Microcrystalline Quartz (SiO2)
sedimentary
Green Jasper / Chert Pebbles
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone Concretion
Sedimentary Clastic Rock (Silicate-rich)
sedimentary
Moonstone
Orthoclase (Potassium aluminum silicate - KAlSi3O8)
mineral
Lazulite
Lazulite (Mg,Fe2+)Al2(PO4)2(OH)2
mineral
Quartzite with Epidote/Chlorite Inclusion
Metamorphic Quartzite (SiO2 with accessory silicate minerals)
metamorphic
Sandstone
Arenite
sedimentary
Likely quartz-bearing metamorphic pebble
Indeterminate; probable quartzite or quartz-rich gneiss with dark mica/amphibole
metamorphic
Tumbled banded iron formation (jasper-rich ironstone)
Banded iron formation, commonly hematite/magnetite with microcrystalline quartz (SiO₂)
sedimentary
Copper Ore (with Malachite/Chrysocolla and Iron Oxides)
Secondary Copper Minerals (Cu2(CO3)(OH)2 / (Cu,Al)2H2Si2O5(OH)4·nH2O)
mineral
Amazonite (microcline feldspar)
K(AlSi3O8) - Potassium Aluminum Silicate
mineral
Gold-bearing Quartz Ore
Auriferous Quartz (SiO2 + Au)
metamorphic
Basalt
Mafic volcanic rock (various silicate minerals)
igneous
Siltstone
Siltstone (composed of mixed silicate minerals and clay)
sedimentary
Unidentified greenish-gray rock fragment
Tentatively altered basalt or basaltic volcanic rock; mineral identification requires testing
igneous
Olivine-rich peridotite / olivine crystal fragment
Olivine, typically (Mg,Fe)₂SiO₄; possibly peridotite if the specimen is rock rather than a single crystal
igneous
Sugilite
KNa2(Fe,Mn,Al)2Li3Si12O30
mineral
Unidentified small mineral fragments
Likely quartz- or feldspar-rich material; species cannot be determined reliably from the image
mineral
Green Quartz (Aventurine or Green Quartzite)
SiO2 (Silicon Dioxide) with mica inclusions
metamorphic
Coprolite
Coprolite (fossilized feces)
fossil
Picture Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic silicate with secondary mineral inclusions)
Igneous
Bauxite
Bauxite (Al2O3·nH2O)
sedimentary
Nephrite Jade
Nephrite (a variety of the mineral actinolite within the amphibole group); Chemical Formula: Ca2(Mg,Fe)5Si8O22(OH)2
Mineral
Schist
Metamorphic Rock (Schist)
metamorphic
Diorite (Salt and Pepper Rock)
Diorite
igneous
Schorl (Black Tourmaline) in Quartz and Feldspar
NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
mineral
Likely tumbled quartz or feldspar fragment
Quartz (SiO₂) or feldspar-group silicate
mineral
Iolite (Cordierite)
Cordierite (Magnesium Aluminum Silicate), Mg2Al4Si5O18
mineral
Moonstone
Adularia (Potassium Aluminum Silicate, KAlSi3O8)
mineral
Iolite
Cordierite (Magnesium iron aluminium silicate)
mineral
Slag (Industrial By-product)
Anthropogenic Vitreous Silica/Iron Silicate
mineral
Mica Schist
Mica Schist (Complex Silicate Rock)
metamorphic