Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Category
Igneous, Sedimentary, Or Metamorphic (Mineral Based)
Browse igneous, sedimentary, or metamorphic (mineral based) specimens identified by the Rock Identifier community.
Learn about Igneous, Sedimentary, Or Metamorphic (Mineral Based) in the encyclopedia
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Aura Quartz Bead
Silicon dioxide (SiO2) with metal coating
mineral with artificial coating
Milky quartz fragment
Quartz (silicon dioxide, SiO₂)
mineral
Zoisite with Hornblende
Zoisite (Ca2Al3(SiO4)3(OH)) with Amphibole inclusions
metamorphic
Iridescent schist or phyllite
Micaceous quartz-rich schist/phyllite, likely containing muscovite or chlorite
metamorphic
Gneiss
Gneissic Metamorphic Rock
metamorphic
Sandstone Pebble
Arenite (SiO2 based)
sedimentary
Dark metamorphic rock, likely slate or phyllite
Foliated metapelite; commonly mica-rich quartz–clay mineral assemblage
metamorphic
Peacock Ore
Bornite (Cu5FeS4) or Chalcopyrite treated with acid
mineral
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Mica Schist
Mica Schist
metamorphic
Geode half
Geode (often quartz/chalcedony based)
sedimentary or igneous
Sandstone
Arenite (predominantly SiO2)
sedimentary
Blue Kyanite in Schist
Al2SiO5 in Mica Schist
metamorphic
Biotite Schist
Biotite Gneiss/Schist (approximate formula K(Mg,Fe)3AlSi3O10(OH)2)
metamorphic
Mixed Tumbled Rocks and Minerals Collection
Mixed Minerals and Rocks (Quartz, Feldspar, Jasper, Agate, Lapis Lazuli, Sodalite, Rose Quartz, Fluorite, etc.)
mineral
Zoisite with Ruby
Anyolite (Calcium aluminum hydroxy silicate with Corundum) Ca2Al3(SiO4)3(OH)
metamorphic
Graphite
Graphite (Carbon, C)
mineral
Painted River Rock (likely Quartzite or Granite)
Quartzite or Granitic Gneiss (painted)
metamorphic
Mixed Gemstone Collection
SiO2 (Quartz varieties) and Biogenic CaCO3 (Nacre)
mineral
Greenschist
Chlorite Schist
metamorphic
Granite Gneiss
Gneiss (containing quartz, alkali feldspar, plagioclase, biotite/amphibole)
metamorphic
Likely chlorite-bearing schist (possibly greenschist)
Chlorite–quartz–mica schist; commonly contains muscovite/biotite and feldspar
metamorphic
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Banded Gneiss
Gneiss (Felsic to Mafic Metamorphic Rock)
metamorphic
Epidote with Quartz Vein
Epidote-bearing metamorphic rock with quartz (Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Gravel / Crushed Stone
Aggregate (mixed mineral rock fragments)
sedimentary
Banded Gneiss
Metamorphic Gneiss
metamorphic
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Greenschist
Chlorite schist
metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary
Muscovite
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Native Gold (in the form of jewelry)
Gold (Au)
mineral
Titanium Quartz (Aura Quartz)
Silicon Dioxide (SiO2) treated with Titanium
mineral
Graphite
Graphite (Native Carbon), Formula: C
Metamorphic
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Greenschist
Chlorite schist
metamorphic
Pyrite-bearing sulfide specimen
Pyrite (FeS₂), possibly with chalcopyrite and weathered sulfides
mineral
Citrine
Citrine (Silicon Dioxide - SiO2)
mineral
Likely mica-rich schist (possibly phyllite)
Muscovite–biotite schist; exact identification requires examination of a fresh surface
metamorphic
River Cobble (Phyllite or Quartzite)
Metasedimentary Rock (often containing SiO2 or KAl2(AlSi3O10)(OH)2)
metamorphic