Gneiss (specifically a Banded Gneiss cobble)
Gneiss (composed mainly of Quartz, Feldspar, and Biotite/Amphibole)
metamorphic
Category
Mineral, Specifically A Detrital Grain
Browse mineral, specifically a detrital grain specimens identified by the Rock Identifier community.
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Yooperlite (Sodalite-bearing Syenite)
Sodalite-rich Syenite
igneous
Ocean Jasper
Orbicular Jasper (variety of Chalcedony/Quartz, SiO2)
sedimentary
Amazonite
Potassium Feldspar (KAlSi3O8) with lead impurities
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2 with impurities of iron)
mineral
Bloodstone / Heliotrope
Silicon dioxide (SiO2) with inclusions
Mineral (variety of Chalcedony)
Banded Sandstone / Siltstone
Sedimentary Rock (Quartzose Sandstone / Siltstone)
sedimentary
Pink Granite
Granite (Felsic Plutonic Rock)
igneous
Amazonite
Microcline (variety Amazonite), K(AlSi3O8)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Pink Granite
Phaneritic plutonic rock (rich in Potassium Feldspar and Quartz)
igneous
Bumblebee Jasper
Fibrous Calcite and Orpiment/Realgar/Pyrite mix
gemstone
Basalt (River Pebble)
Mafic volcanic rock (primarily Plagioclase feldspar and Pyroxene)
igneous
Porphyritic Basalt or Diabase with Plagioclase Phenocrysts
Porphyritic Basalt or Diabase; Mineral: Plagioclase Feldspar
Igneous
Chert / Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Quartz-rich pegmatite
Granitic pegmatite; predominantly quartz (SiO₂), with feldspar and dark accessory minerals such as biotite or tourmaline
igneous
Likely weathered granite or granitic gneiss
Granite/granitic gneiss; chiefly quartz (SiO₂), feldspar, and dark mica or amphibole
igneous
Granite
Intrusive igneous felsic rock
igneous
Ruby in Fuchsite
Corundum (Al2O3) in Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Smoky Quartz on Feldspar (Granite Pegmatite)
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)
igneous
Carnelian
Carnelian Chalcedony (SiO2 with Iron Oxide impurities)
mineral
Hematoid Quartz
Ferruginous Quartz (SiO2 with Fe2O3 inclusions)
mineral
Blue Lace Agate
Chalcedony (SiO2)
mineral
Sandstone (specifically Cross-bedded Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Jasper (specifically Picture Jasper or Landscape Jasper)
Silicon Dioxide (SiO2) - Opaque variety of Chalcedony/Quartz
sedimentary
Sandstone (specifically Arkose or Quartz Arenite)
Arenite (primarily SiO2 with possible Feldspar)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Pink Granite (River Pebble)
Felsic intrusive igneous rock (consisting of Quartz, Orthoclase Feldspar, and Plagioclase)
igneous
N/A (This is a digital image of a bar graph)
Digital Data Visualization (Bar Chart)
This is not a rock or mineral
Schist with Biotite Inclusion
Biotite-bearing Mica Schist (K(Mg,Fe)3AlSi3O10(F,OH)2)
metamorphic
Labradorite
(Ca, Na)(Al, Si)4O8 (Calcium Sodium Aluminum Silicate)
mineral
Aragonite Star Cluster
Aragonite (Calcium Carbonate - CaCO3)
mineral
Peridotite
Ultramafic intrusive igneous rock (composition: (Mg, Fe)2SiO4)
igneous
Turquoise (Blue Howlite imitation)
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Moss Agate
Chalcedony (SiO2 with inclusions)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Blue Topaz
Aluminum Silicate Fluoride Hydroxide Al2SiO4(F,OH)2
mineral