Schist
Mica Schist
metamorphic
Category
Sedimentary Like (Industrial Composite)
Browse sedimentary like (industrial composite) specimens identified by the Rock Identifier community.
Learn about Sedimentary Like (Industrial Composite) in the encyclopedia
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Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Anthracite Coal
Anthracite (C)
sedimentary
Howlite
Howlite — Ca₂B₅SiO₉(OH)₅
mineral
Weathered chert or flint pebble
Microcrystalline quartz (SiO₂), likely chert/flint with possible carbonate or quartz vein
sedimentary
Opalite
Man-made opalescent glass (SiO2 + metal oxides)
mineral (synthetic)
Tumbled brecciated jasper
Brecciated jasper, microcrystalline quartz (SiO₂) with iron-oxide staining and varied silicate fragments
gemstone
Chert (Jasper)
Cryptocrystalline Quartz (SiO2)
sedimentary
Mica Schist
Mica Schist (KAl2(AlSi3O10)(OH)2 - Muscovite component)
metamorphic
Garnet (Almandine)
Almandine (Fe3Al2(SiO4)3)
Mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Graphite
Graphite (Native Carbon, C)
metamorphic
Anthracite Coal
Anthracite (Carbon rank grade)
sedimentary
Diamond (or Diamond Simulant)
Carbon (C)
gemstone
Milky Quartz / Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Quartz (Peach/Orange variety)
Silicon Dioxide (SiO2)
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Chert (Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Tumbled red jasper (probable)
Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides
mineral
Garnet-Bearing Gneiss
Garnetiferous Feldspathic Gneiss
metamorphic
Polished ocean jasper (orbicular jasper)
Microcrystalline quartz/chalcedony (SiO₂) with iron-rich and volcanic inclusions
sedimentary
Fossilized bone fragment
Permineralized vertebrate bone, likely mammalian or reptilian; exact identification requires microscopy
fossil
Quartz Pebble (Geode-like)
Silicon Dioxide (SiO2)
Mineral
Fossilized oyster or bivalve shell
Fossil Gryphaeidae or Ostreoidea; calcitic shell, CaCO₃
fossil
Chert (Yellow Jasper/Flint pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Coal (Anthracite/Bituminous)
Carbo fossilium (primarily Carbon)
sedimentary
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
mineral
Chert (Red Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Orange Calcite
Calcite (CaCO3)
Mineral
Chert (Nodule)
Silicon dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Fossil shark tooth
Likely fossilized shark tooth, possibly Otodus megalodon
fossil
Garnet Schist
Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist
metamorphic
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Red Jasper (Quartz)
Silicon Dioxide (SiO2) with Iron impurities
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Pyrite in Matrix
Iron Sulfide (FeS2)
mineral
Green Jasper (Chert)
Silicon Dioxide (SiO2)
sedimentary
Chert (Nodule)
Chert (Silica, SiO2)
sedimentary
Weathered vuggy quartz-rich rock (probable silicified limestone or quartz breccia)
Microcrystalline quartz (SiO₂) with calcite (CaCO₃), iron oxides, and minor clay minerals
sedimentary
Agatized fossil shell or shell-like chalcedony
Silicified carbonate fossil; microcrystalline quartz (SiO₂) replacing calcite/aragonite
fossil
Chert (Flint)
Chert (SiO2)
sedimentary