Agate
Silicon dioxide (SiO2) - Microcrystalline Quartz
Category
Browse metamorphic and sedimentary specimens identified by the Rock Identifier community.
Agate
Silicon dioxide (SiO2) - Microcrystalline Quartz
Labradorite (a variety of Feldspar)
Labradorite; (Na,Ca)(Al,Si)4O8 (a plagioclase feldspar)
Schist
Chlorite/Mica Schist
Gneiss (Metamorphic Rock)
Gneiss
Garnet (Almandine)
Almandine (Fe3Al2(SiO4)3)
Anthracite Coal
Anthracite (Carbon-based sedimentary-metamorphic rock)
Coarse Sand or Fine Gravel
Detrital Sedimentary Fragments (mostly SiO2)
Garnet (Almandine)
Almandine (Fe3Al2(SiO4)3)
Pyrite-bearing Schist
Pyritic Quartz-Mica Schist with FeS2 inclusion
Magnetite
Magnetite (Fe3O4)
Black Kyanite
Kyanite (Al2SiO5) with carbonaceous inclusions
White Marble
Recrystallized Calcite (CaCO3)
Zebra Rock / Zebra Marble
Banded Limestone-Marble Transition
Banded Gneiss
Gneiss (Metamorphic Rock)
Marble
Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)
Granite Gneiss
Gneiss (High-grade Metamorphic Rock)
Garnet in Matrix (likely Almandine Garnet)
Almandine (Fe3Al2(SiO4)3)
Fuchsite Schist
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2) in Schist
Green Aventurine
Aventurine Quartz (SiO2 with inclusions of Fuchsite)
Quartzite with Hematite staining
Metamorphosed Quartz Sandstone (SiO2)
Schist
Mica Schist (Metamorphic Rock)
Anthracite Coal
Anthracite (Carbon-rich metamorphic sedimentary rock)
Slate
Slate (Foliated Metamorphic Rock)
Mica Schist
Schist (Muscovite/Biotite Schist)
Greywacke (Briarcliff Schist/Gneiss)
Manhattan Schist / Fordham Gneiss complex
Green Aventurine
Silicon Dioxide with Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
Ruby in Zoisite
Zoisite with Corundum (Ca2Al3(SiO4)(Si2O7)O(OH) + Al2O3)
Ruby in Zoisite
Anyolite (Ruby in Zoisite)
Gneiss
Gneiss
Mica Schist
Mica Schist (primarily Muscovite and Biotite composition)
Ferruginous Quartz on Ironstone
Silicon Dioxide (SiO2) with Hematite (Fe2O3)
Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
Marble
Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)
Orange Calcite
Calcium Carbonate (CaCO3)
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
Rainbow Hematite Ring
Iron(III) oxide (Fe2O3) with thin-film coating
Pyrite
Iron Sulfide (FeS2)
Pyrite
Iron Sulfide (FeS2)
Hematite
Iron(III) oxide (Fe2O3)
Pyrite in Matrix (likely Quartz or Schist matrix)
Iron Sulfide (FeS2)
Orange Calcite
Calcium Carbonate (CaCO3)
Calcite
Calcite (Calcium Carbonate - CaCO3)