Green Gneiss or Greenschist
Chlorite/Actinolite Gneiss or Schist
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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Gneiss
Foliated Metamorphic Rock (Gneiss)
metamorphic
Chert (Arrowheads)
Microcrystalline Quartz (SiO2)
sedimentary
Slag (Industrial Glass)
Artificial Vitreous Silicate
mineraloid (anthropogenic)
Greenschist
Chlorite Schist
metamorphic
Yellow Sapphire
Corundum (Al2O3:Fe)
gemstone
Iron-rich vesicular rock, possibly slag or weathered basalt
Identification uncertain; likely ferruginous basalt/ironstone, with possible anthropogenic iron slag
igneous
Greenshist / Chlorite Schist
Chlorite schist (contains (Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6)
metamorphic
Citrine
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon dioxide (SiO2)
mineral
Likely faceted colorless gemstone
Probable quartz (rock crystal), SiO₂; diamond or topaz cannot be excluded from the photograph
gemstone
Basalt cobble
Basalt; predominantly plagioclase, clinopyroxene, and often olivine or iron-titanium oxides
igneous
Citrine (Heat-Treated Amethyst)
Silicon Dioxide (SiO2)
mineral
Fuchsite in Quartz (or Emerald in Fuchsite / Verdite)
Chromian Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2) in Quartz Matrix
metamorphic
Concrete
Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)
sedimentary (anthropogenic / man-made)
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Citrine (likely Heat-Treated Amethyst)
Silicon Dioxide (SiO2)
mineral
Biotite (Black Mica)
Biotite - K(Mg,Fe)3(AlSi3O10)(F,OH)2
mineral
Dark pebble, likely fine-grained basalt
Basalt (tentative; exact identification requires testing)
igneous
Rounded volcanic boulder, likely basalt
Basalt (fine-grained mafic volcanic rock; identification is provisional from the image)
igneous
Rounded dark cobble, likely basalt
Probable basalt; exact identification cannot be confirmed from the photograph
igneous
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Serpentine
(Mg,Fe)3Si2O5(OH)4
metamorphic
Dark weathered igneous rock, likely basalt
Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine or iron oxides
igneous
Muscovite Mica
KAl2(AlSi3O10)(OH)2
mineral
Citrine Geode Fragment
Citrine (Silicon Dioxide with Iron Impurities), SiO2
mineral
Brown Sandstone (River Rock)
Arenite
sedimentary
Green beryl gemstone (likely emerald or green beryl)
Beryl, Be₃Al₂Si₆O₁₈; green color from chromium/vanadium or iron
gemstone
Greenstone (Greenschist facies)
Greenschist (composed primarily of Chlorite, Actinolite, and Epidote)
metamorphic
Muscovite Mica
Muscovite, KAl2(AlSi3O10)(OH)2
mineral
Quartz Pebble (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Biotite in Host Matrix
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Mica
Phlogopite or Biotite group (KMg3(AlSi3O10)(F,OH)2 / K(Mg,Fe)3AlSi3O10(OH)2)
mineral
Mixed Tumbled Stones Collection
Mixed Silicates and Carbonates (Quartz, Amorphous Silica, Carbonates)
multiple
Titanium Quartz (Aura Quartz)
Silicon Dioxide (SiO2) treated with Titanium
mineral
Epidotite (Unakite-related)
Epidote-rich rock
metamorphic
Milky Quartz with Talc / Serpentine
Silicon Dioxide (SiO2) with Mg3Si4O10(OH)2
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz with Muscovite Mica
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate Hydroxide Fluoride (KAl2(AlSi3O10)(F,OH)2)
mineral
Gneiss (with Mica and Quartz)
Gneissic Metamorphic Rock
metamorphic
Biotite mica (likely)
Biotite, a mica-group mineral; approximate formula K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂
mineral
Biotite-rich schist (likely mica schist)
Mica schist; predominantly quartz, biotite mica, and feldspar
metamorphic