Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)
metamorphic
Category
Igneous Or Metamorphic (Base Stone); Anthropogenic (Decoration)
Browse igneous or metamorphic (base stone); anthropogenic (decoration) specimens identified by the Rock Identifier community.
Learn about Igneous Or Metamorphic (Base Stone); Anthropogenic (Decoration) in the encyclopedia
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Rough Ruby
Corundum (Al2O3 with Chromium impurities)
mineral
Mica Schist (Greenschist / Chlorite Schist)
Schist (rich in Muscovite, Chlorite, and Quartz)
metamorphic
Blue Sapphire (in a faceted jewelry setting)
Corundum (Al2O3) with trace Iron and Titanium
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Greenschist
Chlorite Schist
metamorphic
Greenschist
Chlorite schist
metamorphic
Labradorite
(Ca, Na)(Al, Si)4O8
mineral
Biotite Schist
Biotite-rich Schist
metamorphic
Chert (Arrowhead Fragment)
Silicon Dioxide (SiO2)
sedimentary
Biotite on Matrix
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Tumbled orbicular granite or granitic gneiss
Granite, chiefly quartz–feldspar–biotite/amphibole; exact variety uncertain from the image
igneous
Blue Sapphire
Corundum (Al2O3 with iron and titanium trace elements)
mineral
Slag (Industrial Glassy Byproduct)
Anthropogenic silicate byproduct (Slag)
Mineral-like byproduct (often mistaken for igneous rock or meteorite)
Sodalite
Sodalite Na8(Al6Si6O24)Cl2
mineral
Epidote with Quartz Vein
Epidote-bearing metamorphic rock with quartz (Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Red Garnet
Pyrope or Almandine (Silicate group, X3Y2(SiO4)3)
Mineral
Epidosite (Epidote-rich rock)
Epidosite (consisting primarily of Epidote: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))
metamorphic
Nutting Stone / Cupstone (Sandstone or Quartzite)
Sedimentary rock with anthropogenic modification (cupule)
sedimentary
Citrine
Citrine (Silicon Dioxide - SiO2)
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Chert Arrowhead
Cryptocrystalline microcrystalline Quartz (SiO2)
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Biotite mica schist (probable)
Mica schist, dominated by biotite mica (K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂) with quartz and feldspar
metamorphic
Porphyry (specifically Porphyritic Andesite / Rhyolite)
Porphyritic Igneous Rock
igneous
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Corundum (Sapphire/Ruby in Matrix)
Aluminium oxide (Al2O3)
mineral
Diorite
Diorite
igneous
Muscovite Mica
Muscovite KAl2(AlSi3O10)(OH)2
mineral
Muscovite
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Slag
Ferrous slag (by-product of iron smelting)
Mineraloid / Anthropogenic
Gold
Native gold (Au)
mineral
Greenschist
Chlorite schist
metamorphic
Banded Agate (specifically Botryoidal/Orbicular Agate)
Silicon Dioxide (SiO2)
Mineral (variety of Chalcedony/Quartz)
Landscape Boulder / River Rock
Granitic or Quartzite Rock
igneous
Muscovite Mica
KAl2(AlSi3O10)(OH)2
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
mineral
Mica (Lepidolite or Muscovite)
Phyllosilicate mineral (KAl2(AlSi3O10)(OH)2 for Muscovite)
mineral
Weathered quartz-rich pebble
Likely quartz-bearing granite or granitic gneiss; exact identification requires testing
igneous
Gneiss
Gneiss
metamorphic
Biotite Schist
Biotite-rich Schist
metamorphic
Gneiss (specifically a Banded Gneiss pebble)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic