Soapstone / Steatite
Steatite (primarily Talc, Mg3Si4O10(OH)2)
metamorphic
Category
Igneous Or Metamorphic (Base Stone); Anthropogenic (Decoration)
Browse igneous or metamorphic (base stone); anthropogenic (decoration) specimens identified by the Rock Identifier community.
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Biotite Schist
Biotite-bearing Schist (K(Mg,Fe)3AlSi3O10(F,OH)2)
metamorphic
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Gold
Native gold (Au)
mineral
Biotite Gneiss
Gneiss (complex mixture including Biotite K(Mg,Fe)3AlSi3O10(F,OH)2 and Quartz/Feldspar)
metamorphic
Granite pebble
Granite, a coarse-grained felsic intrusive igneous rock composed chiefly of quartz, feldspar, and mica
igneous
Rounded granite pebble
Granite, a quartz–feldspar–mica plutonic rock
igneous
Water-worn fine-grained volcanic pebble, likely basalt
Basalt (tentative identification; fine-grained mafic volcanic rock)
igneous
Water-worn brown pebble, likely basalt or other fine-grained volcanic rock
Undetermined mafic volcanic rock; basalt is a plausible identification
igneous
Schist
Crystalline Metamorphic Schist
metamorphic
Slag
Ferrous slag (by-product of iron smelting)
Mineraloid / Anthropogenic
Blue Sapphire (in a faceted jewelry setting)
Corundum (Al2O3) with trace Iron and Titanium
mineral
Rough Ruby
Corundum (Al2O3 with Chromium impurities)
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Tumbled river pebble, likely basaltic rock
Fine-grained mafic volcanic rock; composition commonly plagioclase, pyroxene, and iron–magnesium minerals
igneous
Nuummite
Nuummite (mixture of anthophyllite and gedrite)
metamorphic
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Asphalt Concrete
Bituminous Concrete (Anthropic Rock)
sedimentary
Marble
Metamorphosed Limestone (primarily calcite CaCO3 or dolomite CaMg(CO3)2)
metamorphic
Greenschist / Chloritaform Schist
Chlorite Schist (Group of Silicate Minerals)
metamorphic
Biotite Mica
Biotite (K(Mg,Fe)3(AlSi3O10)(F,OH)2)
mineral
Biotite on Matrix
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Milky quartz
Quartz (SiO₂)
mineral
Porphyry (specifically Porphyritic Andesite / Rhyolite)
Porphyritic Igneous Rock
igneous
Red Garnet
Pyrope or Almandine (Silicate group, X3Y2(SiO4)3)
Mineral
Mica Schist (Greenschist / Chlorite Schist)
Schist (rich in Muscovite, Chlorite, and Quartz)
metamorphic
Blue Sapphire
Corundum (Al2O3 with iron and titanium trace elements)
mineral
Likely polished greenstone or serpentine inlay
Serpentine-group mineral, commonly antigorite/lizardite; possibly nephrite jade
metamorphic
Schist
Crystalline Metamorphic Rock (Schistose)
metamorphic
Muscovite Mica
Muscovite KAl2(AlSi3O10)(OH)2
mineral
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)
metamorphic
Corundum (Sapphire/Ruby in Matrix)
Aluminium oxide (Al2O3)
mineral
Quartz on Chlorite Schist
Chlorite Schist (Mg,Fe)3(Si,Al)4O10(OH)2 with Quartz (SiO2)
metamorphic
Peacock Ore (Bornite or Chalcopyrite treated with acid)
Bornite (Cu5FeS4) or Acid-washed Chalcopyrite (CuFeS2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Chert Arrowhead
Cryptocrystalline microcrystalline Quartz (SiO2)
sedimentary
Greenschist
Chlorite Schist
metamorphic
Epidote with Quartz Vein
Epidote-bearing metamorphic rock with quartz (Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Mica Schist fragment
Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3(AlSi3O10)(OH)2)
metamorphic
Muscovite Mica
KAl2(AlSi3O10)(OH)2
mineral
Crackled Quartz (Blue Dyed)
Silicon Dioxide (SiO2) with anthropogenic dye
mineral