Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Category
Anthropogenic (Man Made Artifact)
Browse anthropogenic (man made artifact) specimens identified by the Rock Identifier community.
Quartzite (Water-worn Pebble)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Pumice
Pumicite
igneous
Anthracite Coal
Anthracite (Carbon-rich metamorphic rock)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Chert (Gravel specimen)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Pumice
Vesicular Rhyolite (highly vesicular igneous volcanic rock)
igneous
Basalt
Basalt (Composition primarily Plagioclase feldspar, Pyroxene, and Olivine)
igneous
Basalt
Basalt
igneous
Scoria (Lava Rock)
Scoria (highly vesicular extrusive igneous rock)
igneous
Basalt (Vesicular/Scoriaceous)
Extrusive Mafic Volcanic Rock (Primarily Plagioclase Feldspar and Pyroxene)
Igneous
Basalt (River or Beach Pebble)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Ferruginous Sandstone (with Iron Oxide staining)
Clastic Sedimentary Rock - Quartz Arenite/Wacke
sedimentary
Basalt
Extrusive mafic igneous rock; primarily (Ca,Na)(Mg,Fe,Al,Si)2O6 with (Ca,Na)(Al,Si)4O8
igneous
Basalt with Vesicular Surface
Basalt (Mafic Extrusive)
igneous
Jasper (likely a variety of Brecciated Jasper or a patterned variety)
Silicon dioxide (SiO2)
Mineral
Yellow Chalcedony
Chalcedony (a cryptocrystalline variety of Quartz, SiO₂)
Mineral
Epidote (likely Pistacite in Epidosite rock)
Epidote: Ca2(Al,Fe)3(SiO4)3(OH)
metamorphic
Himalayan Salt
Halite (mineral name), chemical formula NaCl (sodium chloride). Generally, 'Himalayan Salt' is a trade name for evaporite minerals from specific regions.
Mineral
Iolite (Cordierite)
Magnesium Iron Aluminum Silicate (Mg,Fe)2Al4Si5O18
mineral
Nephrite Jade
Ca2(Mg, Fe)5Si8O22(OH)2 (Tremolite-Actinolite series)
metamorphic
Basalt
Extrusive Mafic Igneous Rock
igneous
Amethyst
Quartz (Silicon Dioxide, SiO2) with iron impurities
mineral
Amber (Dark/Black Variety)
Succinite (Resinite), C10H16O
mineral
Basalt with Epidote (Greenstone)
Amygdaloidal Basalt (Ca2(Al, Fe)3(SiO4)3(OH) inclusions)
igneous
Larimar
Pectolite (a variety of pectolite, NaCa2Si3O8(OH))
Mineral
Pink Granite / Gneiss
Felsic Plutonic Rock (Granite) with Gneissic banding
igneous / metamorphic
Banded Onyx (Calcite Marble)
Calcite (CaCO3) - Trap-rock or Cave Onyx
sedimentary
Shale or Argillite
Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)
Sedimentary or Metamorphic (low grade)
Snowflake Obsidian (or similar porphyritic volcanic rock)
Obsidian with Spherulites (if glassy), or Porphyritic Rhyolite/Andesite (if crystalline groundmass)
igneous
Schist
Schist (various compositions)
metamorphic
Diamond
Diamond (pure carbon; C)
Mineral
Anthracite Coal
Anthracite (Carbon Content: 86%-97%)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Tumbled Carnelian and Quartz Mix
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Milky Quartz (river pebble)
Quartz (Silicon Dioxide, SiO2)
mineral
Pink Granite
Phaneritic Plutonic Felsic Rock (Granite)
igneous
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
sedimentary
Sandstone (Yellow/Tan Sandstone)
Arenite (primarily Quartz, SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral