Pyrite
Iron Sulfide (FeS2)
mineral
Category
Sedimentary And Metamorphic
Browse sedimentary and metamorphic specimens identified by the Rock Identifier community.
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Tiger's Iron
Pseudomorphic Quartz Aggregate (contains SiO2 with Fe2O3 and FeOOH)
metamorphic
Muscovite Mica Schist
Metamorphic Rock (Muscovite-Biotite Schist)
metamorphic
Dark gray metamorphic rock, likely hornfels or fine-grained amphibolite
Hornfels/amphibolite; commonly quartz, feldspar, amphibole, biotite, and minor sulfides
metamorphic
Banded Slate Pebble
Metamorphosed Mudstone / Slate
metamorphic
Biotite Schist
Biotite-rich Schist
metamorphic
Garnet Schist
Almandine Garnet in Mica Schist
metamorphic
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Magnetite
Magnetite (Iron(II,III) oxide, Fe3O4)
mineral
Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Gneiss
Metamorphic Gneiss (High-grade regional metamorphism)
metamorphic
Gneiss
Metamorphic Gneiss (High-grade regional metamorphism)
metamorphic
Magnetite
Fe3O4 (Iron(II,III) oxide)
mineral
Quartz Mica Schist
Mica-Quartz Schist (Chemical: SiO2 + KAl2(AlSi3O10)(OH)2)
metamorphic
Likely purple quartzite or purple chert
Quartzite/chert, predominantly microcrystalline SiO₂; exact identification requires testing
metamorphic
Kyanite in Quartz
Kyanite (Al2SiO5) with Quartz (SiO2) matrix
metamorphic
Muscovite Schist with Quartz
KAl2(AlSi3O10)(OH)2 in Schistose matrix
metamorphic
Small rounded pebble, likely quartz-rich river stone
Indeterminate; likely quartz/chert-bearing lithic clast
sedimentary
Gold-bearing Quartz / Auriferous River Rock
Lode Gold in Quartz Matrix (SiO2 + Au)
sedimentary
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Gneiss
Gneissic Metamorphic Rock
metamorphic
Gneiss
Gneissic Metamorphic Rock
metamorphic
Garnet (specifically Almandine)
Almandine - Fe3Al2(SiO4)3
metamorphic
Weathered mica-rich metamorphic rock
Probable biotite schist or mica schist
metamorphic
Banded Gneiss Pebble
Banded Gneiss
metamorphic
Small white mineral fragment
Indeterminate; possibly quartz, calcite, or feldspar
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
White Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz pebble
Quartz (Silicon dioxide, SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Blue Quartz
Silicon Dioxide (SiO2) with microscopic inclusions
mineral