Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic silicate with secondary mineral inclusions)
Igneous
Category
Mineral (Tectosilicate)
Browse mineral (tectosilicate) specimens identified by the Rock Identifier community.
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Sandstone (with potentially metamorphic or basaltic bands)
Arenite / Lithic Wacke
sedimentary
Amazonite
K(AlSi3O8) - Microcline
mineral
N/A - Image is non-geological
Acrylonitrile Butadiene Styrene (ABS) or Polypropylene (PP)
Synthetic material (Plastic/Polymer)
Quartzite and Jasper Pebbles
Quartzite (re-crystallized Quartz) and Cryptocrystalline Quartz (SiO2)
metamorphic
Chalcedony Geode Fragment (Botryoidal)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Phantom Quartz (Chlorite Inclusion)
Silicon Dioxide (SiO2) with Chlorite (Mg,Fe,Al)6(Si,Al)4O10(OH)8
mineral
Iron-Stained Quartz (Riverside Cobble)
Silicon Dioxide (SiO2) with Limonite/Hematite inclusions
mineral
Fossil Shark Tooth
Carcharadon sp. (likely Carcharodon carcharias or similar Lamniformes)
fossil
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Turquoise
Turquoise - CuAl6(PO4)4(OH)8·4H2O
mineral
Sandstone (with Limonite staining)
Arenite (primarily SiO2 with FeO(OH)·nH2O)
sedimentary
Sandstone
Arenite (SiO2 secondary)
sedimentary
Red Sandstone
Arenite (Fe2O3 rich)
sedimentary
Banded Sandstone
Arenite (with iron oxide banding)
sedimentary
Quartz (Milky/Crystalline)
Silicon Dioxide (SiO2)
mineral
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Sandstone (Ferruginous)
Arenite (Siliclastic Sedimentary Rock)
sedimentary
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Quartz (Milky or Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Iron-rich or Arkosic)
Arenite (SiO2 with FeO(OH) or Fe2O3 staining)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Green Sandstone
Glauconitic Sandstone
sedimentary
Red Sandstone
Arenite (primarily SiO2 with Fe2O3)
sedimentary
Gold in Quartz Ore
Hydrothermal Quartz with native Gold (Au)
mineral
Basalt
Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Vesicular Basalt
Basalt (Mafic Extrusive Volcanic Rock)
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Feldspar-rich Pegmatite
Granitic Pegmatite (principally KAlSi3O8)
igneous
Granite Pebble
Felsic intrusive igneous rock (composition: Quartz, Feldspar, Mica)
igneous
Quartzite with Chlorite staining
Metamorphic Quartzite (SiO2 with Chlorite inclusions)
metamorphic
Pegmatite
Granitic Pegmatite
igneous
Quartzite with Dark Mineral Inclusions
Quartzite (primarily SiO2) with accessory minerals
metamorphic
Schist
Mica Schist
metamorphic
Granite
Granite (Phaneritic Igneous Rock)
igneous
Granodiorite / Granite (Weathered)
Granodiorite
Igneous
Gypsum (Wallboard/Drywall)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
sedimentary
Chromite
Chromite (FeCr2O4)
mineral
Snowflake Obsidian
Volcanic Glass with Spherulitic Cristobalite (SiO2)
igneous
Quartz Chip
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 based with mineral cement)
sedimentary