Fired Clay Brick (Anthropic Rock substitute)
Anthropogenic polycrystalline ceramic (predominantly Mullite and Quartz: Al6Si2O13 + SiO2)
metamorphic (man-made / anthropic)
Category
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Browse this image does not display a rock, mineral, or geological specimen. it shows a human hand wearing a ring. specimens identified by the Rock Identifier community.
Milky Quartz
Silicon Dioxide (SiO₂)
Mineral
Amethyst
Amethyst (SiO₂)
Mineral
White Agate (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Orthoclase Feldspar (Salmon variety)
Orthoclase, KAlSi3O8
mineral
Moqui Marble (Shaman Stone)
Ironstone Concretion (Fe2O3) - primarily Hematite or Goethite shell with Sandstone core
sedimentary
Granite
Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Mica Schist
Mica Schist (Composition typically includes Muscovite KAl2(AlSi3O10)(OH)2 and Quartz SiO2)
metamorphic
Peacock Ore (Bornite or Iridescent Chalcopyrite)
Bornite (Cu5FeS4) or Chalcopyrite (CuFeS2) with oxidation
mineral
Chert (Jasper Variant likely)
Silicon Dioxide (SiO2)
Sedimentary Rock or Mineral (depending on origin and purity)
Limonite (Bog Iron)
Limonite (Hydrated iron(III) oxide-hydroxide) - FeO(OH)·nH2O
mineral
Mica Schist
Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3AlSi3O10(OH)2)
metamorphic
Granite
Phaneritic Intrusive Igneous Rock (Granite)
igneous
Chert (Nodular)
Chert (SiO2 - Microcrystalline Quartz)
sedimentary
Gneiss
Gneiss (High-grade metamorphic rock composed primarily of Quartz, Feldspar, and various Micas)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Granite (White Granite variant)
Phaneritic Plutonic Rock (High-silica Felsic)
igneous
Amygdaloidal Basalt with Quartz/Zeolite Infill
Amygdaloidal Basalt (extrusive volcanic rock with SiO2 or CaAl2Si3O10·3H2O infill)
igneous
Sandstone Concretion
Clastic Sedimentary Rock (primarily SiO2 with mineral cement)
sedimentary
Granite
Granite (Felsic Plutonic Rock / SiO2 + Al2O3 + K2O + Na2O + CaO + FeO + MgO)
igneous
Green Schist
Greenschist (composed of Chlorite, Actinolite, and Epidote)
metamorphic
Vesicular Basalt with Secondary Mineral Inclusions
Aphanitic Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Puddingstone
Conglomerate (specifically a type of jasper conglomerate or quartz conglomerate)
Sedimentary
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Gneiss (specifically Pink Gneiss)
Gneiss (high-grade regional metamorphic rock)
metamorphic
Sapphire (Corundum)
Corundum (Al2O3), variety Sapphire
Mineral
Prehnite
Prehnite, Ca2Al2Si3O10(OH)2
Mineral
Schist (Garnet-Mica Schist)
Garnetiferous Mica Schist (primarily Muscovite/Biotite and Almandine Garnet)
metamorphic
Granite
Granite (Phaneritic Igneous Rock / Quartz, Feldspar, Mica)
igneous
Travertine (used in construction, not a 'specimen' in situ)
Travertine
Sedimentary
Flower Agate (Cherry Blossom Agate)
Chalcedony (Silicon Dioxide) with Opaque Inclusions - SiO2
mineral
Amethyst Geode
Quartz (SiO₂) with iron impurities
Mineral/Igneous (secondary formation)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Greenschist (Greenstone)
Greenschist (Metamorphic rock containing chlorite, actinolite, and epidote)
metamorphic
Granite
Plutonic Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)
igneous
Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Dearest Jewelry (Multigemstone)
Combination of Diamond (C), Emerald (Be3Al2Si6O18), Amethyst/Rock Crystal (SiO2), Ruby (Al2O3), Emerald (Be3Al2Si6O18), Sapphire (Al2O3), and Topaz (Al2SiO4(F,OH)2)
Mineral
Granite
Phaneritic Intrusive Igneous Rock (composed of Quartz, Feldspar, and Mica)
igneous
Granite
Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Peridot in Basalt/Xenolith
Olivine (Mg, Fe)2SiO4 in Vesicular Basalt
igneous