Dendritic Agate
Silicon Dioxide with Manganese/Iron oxide inclusions (SiO2)
Mineral
Category
Synthetic (Not A Rock Or Mineral)
Browse synthetic (not a rock or mineral) specimens identified by the Rock Identifier community.
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Quartz Vein in Schist
Quartz (SiO2) in Pelitic Schist
metamorphic
Geode (Chert or Quartz Nodule)
Silicon Dioxide (SiO2)
sedimentary
Limonite Concretion
Goethite/Limonite (FeO(OH)·nH2O)
sedimentary
Pebble or Cobble (likely composed of sandstone or conglomerate)
Clastic Sedimentary Rock (specific name like sandstone, conglomerate, or breccia would require microscopic analysis of clast size and angularity)
Sedimentary Rock (possibly a conglomerate or coarse-grained sandstone)
Red Sandstone
Sandstone (mainly SiO2 with Iron Oxide cement)
sedimentary
Sandstone
Clastic Sedimentary Rock (composed primarily of Quartz: SiO2)
sedimentary
Sandstone (Ferruginous)
Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide cement)
sedimentary
Quartz Geode
Crystalline Silicon Dioxide (SiO2)
mineral
Banded Siltstone
Banded Siltstone / Laminated Siltstone
sedimentary
Granite
Phaneritic Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)
igneous
Mixed River Stones and Minerals
Mixed Silica-rich Stones (Quartz, Agate, Jasper, Sandstone, Dalmation Stone)
sedimentary
River Pebble
Weathered Rock Fragment
sedimentary
Mica Schist
Metamorphic Rock (Schistose)
metamorphic
Turquoise
Turquoise - CuAl6(PO4)4(OH)8·4H2O
mineral
Mica Schist
Mica Schist (varies based on mineral makeup, often Biotite/Muscovite schist)
metamorphic
Turquoise
Hydrated phosphate of copper and aluminum (CuAl6(PO4)4(OH)8·4H2O)
mineral
River Pebble
Polished Rock Fragment
sedimentary
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Quartz vein in Host Rock
Crystalline Silicon Dioxide (SiO2) in Lithic Matrix
metamorphic
Kimberlite
Ultramafic igneous rock
igneous
Granite
Intrusive Igneous Rock
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Vesicular Basalt with Siltstone
Mafic Volcanic Rock (Basaltic Composition)
igneous
Pink Granite Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Granite
Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)
igneous
Sandstone (Calcareous or Ferruginous)
Clastic sedimentary rock (SiO2 with CaCO3 or Fe2O3 cement)
sedimentary
Quartz (Variety of Rough Mineral Specimens)
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Quartz Geode Fragment
Crystalline Silicon Dioxide (SiO2)
mineral
Red Sandstone
Arenite (with Iron Oxide)
sedimentary
Shale with Iron Staining
Fissile Argillaceous Sedimentary Rock
sedimentary
Carnelian
Carnelian (SiO2 with Iron Oxide impurities)
mineral
Basalt River Stone with Mineral Crust
Aphanitic Mafic Igneous Rock
igneous