Pyrite
Iron Disulfide (FeS2)
Category
Browse sedimentary or metamorphic derived specimens identified by the Rock Identifier community.
Pyrite
Iron Disulfide (FeS2)
Red Garnet (likely Almandine or Pyrope)
Garnet group: X3Y2(SiO4)3 (e.g., Almandine: Fe3Al2Si3O12)
Gneiss
Metamorphic Gneiss (High-grade regional metamorphism)
Fluorite, Turquoise, and Calcite set
Calcium Fluoride (CaF2), Hydrous Phosphate of Copper and Aluminum (CuAl6(PO4)4(OH)8·4H2O), Calcium Carbonate (CaCO3)
Orange Calcite
Calcium Carbonate (CaCO3)
Kyanite
Kyanite (Al2SiO5)
Greenish Metamorphic Rock (likely containing epidote or chlorite)
Metamorphic rock, possibly epidosite or greenstone
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
Serpentinite
Serpentinite (a rock composed predominantly of serpentine group minerals)
Tiger's Eye, Hematite, and Black Obsidian Bracelet
SiO2 (Tiger's Eye), Fe2O3 (Hematite), and 70-75% SiO2 (Obsidian)
Pyrite
Iron Sulfide (FeS2)
Quartz (Small Fragment)
Silicon Dioxide (SiO2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Graphite
Graphite (C)
Clear Quartz
Silicon Dioxide (SiO2)
Clear Quartz
Silicon Dioxide (SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Yellow Calcite
Calcium Carbonate (CaCO3)
Clear Quartz Crystal
Silicon Dioxide (SiO2)
Magnetic Sand Grain / Magnetite Pellet
Magnetite (Fe3O4)
Note: Image shows a biological specimen (Rat), not a rock. Representative geological equivalent: Galena (due to lead-grey colors in fur).
Galena (PbS)
Quartz (Granular)
Silicon Dioxide (SiO2)
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
Quartz Crystal Fragment
Silicon Dioxide (SiO2)
Apatite
Fluorapatite (Ca5(PO4)3F)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Aventurine (likely Green Aventurine)
Silicon Dioxide (SiO2) with included minerals (Fuchsite for green)
Red Jasper (Jasper)
Silicon Dioxide (SiO2) with iron oxide inclusions
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
Yellow Sapphire or Citrine
Al2O3 (Corundum) or SiO2 (Quartz)
Greenschist
Greenschist facies metamorphic rock
Slate
Foliated Metamorphic Rock (Mainly composed of Quartz, Illite, Chlorite)
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
Red Jasper
Jasper (a variety of Chalcedony, SiO₂)
Quartz Geode
Silicon Dioxide (SiO2)
Limonite (Iron Stone/Ocher)
Limonite (FeO(OH)·nH2O)
Yellow Jasper
Jasper (Silicon Dioxide, SiO2)