Fossiliferous Limestone
Bioclastic Limestone (CaCO3)
sedimentary
Category
Mineralological Specimen
Browse mineralological specimen specimens identified by the Rock Identifier community.
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Mica Schist with Garnet
Almandine-Mica Schist
metamorphic
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Pink-and-gray quartz-rich pegmatite, possibly rose quartz with feldspar
Quartz (SiO₂) with K-feldspar/plagioclase; likely pegmatitic granite
igneous
Amethyst quartz crystal
Quartz, silicon dioxide (SiO₂), purple variety amethyst
mineral
Lightning Stone / Fulgurite-impregnated or Septarian-like Agate
Silicon dioxide (Quartz/Chalcedony) with host rock matrix
sedimentary
Possible fossilized shell or coral fragment
Indeterminate biogenic carbonate, likely calcite (CaCO₃)
fossil
Glauconitic Sandstone (or Greenstone)
Glauconitic Sandstone with Quartz
sedimentary
Granite with Tourmaline or Biotite
Phaneritic Igneous Rock (Granoid)
igneous
Banded Sandstone
Quartz Arenite (with iron oxide banding)
sedimentary
Conglomerate
Conglomeratic Sandstone
sedimentary
Porphyritic Andesite
Andesite (Porphyritic texture)
igneous
Quartz Geode with Goethite/Hematite
Silicon Dioxide (SiO2) with Iron Oxides
mineral
Smoky Quartz (Herkimer-style)
Silicon Dioxide (SiO2)
mineral
Quartzite with Hematite staining
Quartzite (SiO2)
metamorphic
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Concretion
Septarian Concretion (Fragmentary)
sedimentary
Schist
Mica Schist (Metamorphic Rock)
metamorphic
Jasper
Silicon Dioxide (SiO2)
sedimentary
Generic Rock Fragment
Rock Fragment
sedimentary
Carnelian
SiO2 (Silicon dioxide)
mineral
Brachiopod Fossil in Sedimentary Rock
Phylum Brachiopoda fossil imprint in sedimentary matrix
fossil
Quartz in Greenstone
Metamorphic rock with quartz vein (SiO2 / mixed silicates)
metamorphic
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
mineral
Quartz-veined Basalt or Limestone Pebble
Quartz vein in host rock (Silicate mineral in carbonate or volcanic matrix)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone Concretion
Sedimentary Concretion (Quartz sand bound by mineral cement)
sedimentary
Vein Quartz in Basalt or Mafic Rock
Silicon Dioxide (Quartz veins in volcanic host rock)
igneous
Agate
Silicon Dioxide (Chalcedony), SiO2
gemstone
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral
Iron-Stained Quartz
Silicon Dioxide with Iron Oxide (SiO2 with Fe2O3)
mineral
River Cobble (Basaltic/Andesitic)
Mafic to Intermediate Volcanic Rock
igneous
Moss Agate
Silicon dioxide (SiO2) with inclusions
Mineral
Slate with Fossiliferous Impressions
Metamorphosed Argillaceous Rock (Fossiliferous Slate)
metamorphic
Chert (or Chalcedony) Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Chalcedony
Silicon Dioxide (SiO2)
mineral
Jasper-Agate
Silicon Dioxide (SiO2)
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Cubic Zirconia
Cubic Zirconium Dioxide (ZrO2)
gemstone
Fossiliferous Limestone with Crinoid Stem
Sedimentary Rock with Echinodermata fossil fragment
fossil
Quartz (Chalcedony/Agate)
Silicon Dioxide (SiO2)
mineral