Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Category
Mineral, Often A Rock Given Its Aggregate Nature
Browse mineral, often a rock given its aggregate nature specimens identified by the Rock Identifier community.
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Emerald / Fluorite
Beryl (Be3Al2Si6O18) / Fluorite (CaF2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite or Iron Oxide inclusions
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Basalt
Extrusive Igneous Rock
igneous
Coquina
Coquina (Bioclastic Limestone)
sedimentary
Banded Jasper (possibly "Picture Jasper")
Jasper (a microcrystalline variety of Quartz / Silicon Dioxide - SiO2)
Sedimentary rock (specifically a chemical sedimentary rock, or a chert if considered purely mineral aggregate)
Chrysocolla
Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nHeO)
mineral
Milky Quartz with Country Rock contact
Silicon Dioxide (SiO2) in contact with Metamorphic/Igneous rock
mineral
Quartz (likely a macrocrystalline variety like milky quartz or smoky quartz, given the appearance in the image)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Chrysocolla on Matrix
Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Sandstone (Graywacke)
Arenite / Graywacke (SiO2 with lithic fragments)
sedimentary
Granite River Rock
Intrusive igneous rock (composed mainly of quartz, alkali feldspar, and plagioclase)
igneous
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Jasper
Silicon Dioxide (SiO2)
mineral
Granite or Granitic Gneiss River Rock
Granite / Gneiss
Igneous or Metamorphic
Pyrite
Iron Disulfide (FeS2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Moss Agate
SiO2 (Silicon Dioxide) with dendritic inclusions
Mineral
Vesicular Basalt (or Porphyritic Scoria)
Vesicular Basalt
igneous
Quartz on Host Rock
Silicon Dioxide (SiO2)
Mineral Specimen
Schist
Schist (various compositions)
metamorphic
Chrysocolla on Matrix
Hydrated copper phyllosilicate mineral (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Limestone (Chalk / Calcite Rock)
Calcium Carbonate (CaCO3)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Red Jasper
Microcrystalline Quartz (SiO2) with iron oxide inclusions
sedimentary
Sandstone (Calcareous/Lithic)
Sedimentary Rock (Clastic Sandstone with Calcium Carbonate cement)
sedimentary
Scoria
Scoria
Igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Rhyolite
Rhyolite, felsic extrusive igneous rock
igneous
Sandstone (Fossiliferous)
Arenite / Clastic Sedimentary Rock
sedimentary
Gravel and Sand Aggregate
Unconsolidated Clastic Sediment
sedimentary
Quartzite with Pyrite Inclusions
Metamorphic Quartz-rich Rock
metamorphic
Sandstone (River Stone)
Arenite (composed primarily of SiO2)
sedimentary
Eclogite
Eclogite (Omphacite-Garnet rock)
metamorphic
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Silicon
Element Si
mineral
Build-A-Bear Plush (Non-Geological)
Polyester fibers (C10H8O4)n and Synthetic Polymers
Anthropogenic / Non-mineral