Green Common Opal
Hydrated Silica (SiO2·nH2O)
mineral
Category
Sedimentary (Microcrystalline Silicate)
Browse sedimentary (microcrystalline silicate) specimens identified by the Rock Identifier community.
Learn about Sedimentary (Microcrystalline Silicate) in the encyclopedia
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Glauconitic Sandstone
Glauconitic Quartz Arenite
sedimentary
Chrysoprase
Chalcedony (Silicon Dioxide, SiO2)
gemstone
Chrysocolla in Jasper (Chryso-Jasper)
Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O (Chrysocolla) + SiO2 (Jasper)
mineral
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Bauxite
Bauxite (Al(OH)3, AlO(OH))
sedimentary
Kaolinite Claystone
Al2Si2O5(OH)4 (Kaolinite)
sedimentary
Limonite (Iron Ore)
Limonite (unstructured hydrated iron(III) oxide-hydroxides, often FeO(OH)·nH2O)
mineral
Marble
Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)
metamorphic
Greenstone / Metagraywacke
Metamorphosed basaltic or sedimentary rock (Complex Silicate)
metamorphic
Granitic Gneiss
Gneiss (Complex silicate composition)
metamorphic
Shale
Lutaceous Rock (Hydrous Aluminum Silicates)
sedimentary
Sandstone (likely Graywacke or Lithic Arenite)
Clastic sedimentary rock predominantly composed of silicate grains
sedimentary
Sandstone
Arenite
sedimentary
Cream Marble (Speckled)
Metamorphosed Limestone (mainly CaCO3)
metamorphic
Yellow Jade (often Serpentine or Dolomite)
Primarily Serpentine (Mg3Si2O5(OH)4) or Dolomite (CaMg(CO3)2), though the term 'yellow jade' is also sometimes applied to varieties of true nephrite or jadeite.
Mineral, often a rock given its aggregate nature
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Bauxite
AlOx(OH)3-2x (mixture of Gibbsite, Boehmite, and Diaspore)
sedimentary
White Marble
Metamorphosed Limestone (principally CaCO3)
metamorphic
Gastropod Fossil
Class Gastropoda (fossilized)
fossil
Bumblebee Jasper
Calcite with Arsenic and Sulfur inclusions
sedimentary
Fossilized Coprolite
Coprolite (fossilized feces)
sedimentary
Mookaite Jasper
Radiolarite (Silica-rich sedimentary rock featuring Hematite and Goethite)
sedimentary
Ruby in Kyanite
Corundum in Disthene (Al2SiO5 + Al2O3)
metamorphic
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Bauxite
Bauxite (Al2O3·nH2O)
sedimentary
Sandstone with Hematite staining
Arenite with Fe2O3 inclusions
sedimentary
Banded Gneiss
Gneiss (complex metamorphic silicate rock)
metamorphic
Sandstone (with Iron Oxide staining)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Sandstone
Arenite
sedimentary
Schist
Metamorphic Rock (Schist)
metamorphic
Kyanite (within Quartz)
Kyanite (Al2SiO5) in crystalline Quartz base (SiO2)
metamorphic
Glauconitic Sandstone
Glauconitic Sandstone (Greensand)
sedimentary
Coprolite
Coprolite (fossilized feces)
fossil
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Terracotta (Man-made ceramic brick fragment)
Baked clay / High-iron ceramic (Silicate-based ceramic)
Anthropogenic material (Man-made sedimentary mimic)
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Ceramic or Polished Stone Heart (Anthropogenic Material)
Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)
Synthetic/Anthropogenic Mineraloid
Conglomerate
Clastic Sedimentary Conglomerate (SiO2 primarily)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2)
sedimentary