Sandstone
Arenite (predominantly SiO2)
sedimentary
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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Biotite Schist
Biotite Gneiss/Schist (approximate formula K(Mg,Fe)3AlSi3O10(OH)2)
metamorphic
Granite Gneiss
Gneiss (containing quartz, alkali feldspar, plagioclase, biotite/amphibole)
metamorphic
Greenschist
Chlorite schist
metamorphic
Mixed Tumbled Rocks and Minerals Collection
Mixed Minerals and Rocks (Quartz, Feldspar, Jasper, Agate, Lapis Lazuli, Sodalite, Rose Quartz, Fluorite, etc.)
mineral
Native Gold (in the form of jewelry)
Gold (Au)
mineral
Citrine
Citrine (Silicon Dioxide - SiO2)
mineral
Epidote with Quartz Vein
Epidote-bearing metamorphic rock with quartz (Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Graphite
Graphite (Carbon, C)
mineral
Greenschist
Chlorite schist
metamorphic
Quartzite Pebble
Quartzite (SiO2 based)
metamorphic
Gneiss
Gneissic Metamorphic Rock
metamorphic
Epidote (Unakite variety)
Epidosite (Metasomatic rock containing Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Blue Kyanite in Schist
Al2SiO5 in Mica Schist
metamorphic
Zoisite with Ruby
Anyolite (Calcium aluminum hydroxy silicate with Corundum) Ca2Al3(SiO4)3(OH)
metamorphic
Banded Gneiss
Gneiss (Felsic to Mafic Metamorphic Rock)
metamorphic
Titanium Quartz (Aura Quartz)
Silicon Dioxide (SiO2) treated with Titanium
mineral
Gravel / Crushed Stone
Aggregate (mixed mineral rock fragments)
sedimentary
Muscovite
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Graphite
Graphite (Native Carbon), Formula: C
Metamorphic
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Polished Stone Pendant (Identity Unclear)
Unknown (Possibly Jasper/Agate/Quartz mixture)
mineral
River Cobble (Phyllite or Quartzite)
Metasedimentary Rock (often containing SiO2 or KAl2(AlSi3O10)(OH)2)
metamorphic
Banded Gneiss
Metamorphic Gneiss
metamorphic
Marble
Metamorphosed Limestone (principally CaCO3)
metamorphic
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Gneiss (Metamorphosed Granitic Rock)
Gneiss (composed mainly of quartz, feldspar, biotite, and/or hornblende)
metamorphic
Gneiss
Metamorphic Gneiss
metamorphic
Mica-rich Schist fragment
Mica Schist
metamorphic
Gneiss (Augen Gneiss)
Augen Gneiss
metamorphic
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Gneiss
Gneiss
metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Mixed Gemstone Bracelet
Mixed natural minerals and rocks (e.g., Rhodonite, Malachite, Sodalite, Rose Quartz, Black Tourmaline, Quartz/Chalcedony variants)
Mineral/Rock assemblage
Sandstone Pebble
Arenite (SiO2 based)
sedimentary
Gneiss
Gneiss (Metamorphic rock composed primarily of quartz, feldspar, and mica)
metamorphic
Green Mica Schist
Mica Schist (Fuchsite or Chlorite variety)
metamorphic
Gneiss
Gneiss (High-Grade Metamorphic Rock)
metamorphic
River Pebble (Gneiss/Schist mix)
Metamorphic rock aggregate
metamorphic
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic