Yellow Sapphire
Corundum (Al2O3:Fe)
gemstone
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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Citrine
Silicon Dioxide (SiO2)
mineral
Muscovite Mica
Muscovite / KAl2(AlSi3O10)(OH)2
mineral
Schist
Mica Schist
metamorphic
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Blue Aura Quartz
Silicon Dioxide (SiO2) with metallic vapor coating
mineral
Quartzite Pebble
Metamorphosed Sandstone (SiO2)
metamorphic
Graphite
Graphite (C)
mineral
Amethyst
Quartz (Silicon Dioxide with iron impurities), SiO2
mineral
Epidotite (Unakite-related)
Epidote-rich rock
metamorphic
Dark weathered igneous rock, likely basalt
Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine or iron oxides
igneous
Greenstone (Greenschist facies)
Greenschist (composed primarily of Chlorite, Actinolite, and Epidote)
metamorphic
Muscovite Mica
Muscovite (Potassium Aluminum Silicate Hydroxide), KAl2(AlSi3O10)(OH)2
mineral
Milky Quartz with Talc / Serpentine
Silicon Dioxide (SiO2) with Mg3Si4O10(OH)2
metamorphic
Quartzite (River Stone)
Quartzite (SiO2)
metamorphic
Schist
Schist (Crystalline Metamorphic Rock)
metamorphic
Mica
Phlogopite or Biotite group (KMg3(AlSi3O10)(F,OH)2 / K(Mg,Fe)3AlSi3O10(OH)2)
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Biotite in Host Matrix
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Gneiss
Foliated Metamorphic Rock (Gneiss)
metamorphic
Biotite Gneiss
Gneiss (complex mixture including Biotite K(Mg,Fe)3AlSi3O10(F,OH)2 and Quartz/Feldspar)
metamorphic
Chert (often called Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Biotite Schist
Biotite-bearing Schist (K(Mg,Fe)3AlSi3O10(F,OH)2)
metamorphic
Dyed Quartzite
Metamorphosed Quartz (SiO2) with synthetic pigment
metamorphic
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Slag (Industrial Glass)
Artificial Vitreous Silicate
mineraloid (anthropogenic)
Granite Pebble
Intrusive Igneous Rock (Granite/Diorite aggregate)
igneous
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Titanium Quartz (Aura Quartz)
Silicon Dioxide (SiO2) treated with Titanium
mineral
Citrine (Heat-Treated Amethyst)
Silicon Dioxide (SiO2)
mineral
Biotite (Black Mica)
Biotite - K(Mg,Fe)3(AlSi3O10)(F,OH)2
mineral
Muscovite Mica
Muscovite, KAl2(AlSi3O10)(OH)2
mineral
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Soapstone / Steatite
Steatite (primarily Talc, Mg3Si4O10(OH)2)
metamorphic
Gneiss (with Mica and Quartz)
Gneissic Metamorphic Rock
metamorphic
Quartz on Chlorite Schist
Chlorite Schist (Mg,Fe)3(Si,Al)4O10(OH)2 with Quartz (SiO2)
metamorphic
Quartz with Muscovite Mica
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate Hydroxide Fluoride (KAl2(AlSi3O10)(F,OH)2)
mineral
Gneiss (Metamorphic Rock)
Gneiss
metamorphic
Asphalt Concrete
Bituminous Concrete (Anthropic Rock)
sedimentary
Greenschist / Chloritaform Schist
Chlorite Schist (Group of Silicate Minerals)
metamorphic
Muscovite Mica
KAl2(AlSi3O10)(OH)2
mineral
Mica Schist fragment
Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3(AlSi3O10)(OH)2)
metamorphic