Ruby in Kyanite
Corundum in Disthene (Al2SiO5 + Al2O3)
metamorphic
Category
Sedimentary (Microcrystalline Silicate)
Browse sedimentary (microcrystalline silicate) specimens identified by the Rock Identifier community.
Jasper (Green Jasper/Chert)
Silicon Dioxide (SiO2)
sedimentary
Chrysocolla in Jasper (Chryso-Jasper)
Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O (Chrysocolla) + SiO2 (Jasper)
mineral
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Bauxite
Bauxite (Al2O3·nH2O)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Marble
Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)
metamorphic
Green Moss Agate
Agate (Silicon Dioxide - SiO2) with inclusions of hornblende or chlorite
mineral
Jadeite Jade
Jadeite (Sodium Aluminum Silicate, NaAlSi₂O₆)
metamorphic
Green Calcite (often commercially called Green Onyx)
Calcium Carbonate (CaCO3)
Mineral
Jasper with Epidote Vein
Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate (Ca2(Al,Fe)3(SiO4)3(OH))
sedimentary
Dalmatian Stone
Dalmatian Jasper / Feldspathic Igneous Rock
igneous
Coprolite
Fossilized feces (various taxa)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe2O3 rich)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 inclusions)
sedimentary
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Anthracite Coal
Anthracite (Carbon-rich metamorphic rock)
metamorphic
Mica Schist with Pyrite
Muscovite/Biotite Schist (Complex Silicate)
metamorphic
Blue Quartz (Aventurine)
Silicon Dioxide (SiO2) with Crocidolite or Magnesio-riebeckite inclusions
metamorphic
Aquamarine (Pendant) and Jasper (Beads)
Beryllium aluminum silicate (Be3Al2Si6O18) with Chalcedony (SiO2)
mineral
Sandstone (with ripple marks)
Arenite (SiO2 primarily)
sedimentary
Sandstone (Ferruginous)
Arenite (with Iron Oxide)
sedimentary
Banded Gneiss
Gneiss (high-grade metamorphic silicate rock)
metamorphic
Man-made Polished Porcelain Tile (Artificial Geologic Lookalike)
Fused Silicate Ceramic with Alumina (Synthetic Kaolinite derivative)
Synthetic (Ceramic)
Mica Schist with Garnet inclusions
Mica Schist (primarily Muscovite and Biotite - KAl2(AlSi3O10)(OH)2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Picasso Stone
Metamorphosed Calcium Carbonate (Limestone)
sedimentary
Moss Agate
Chalcedony (SiO2) with inclusions of hornblende or chlorite
mineral
Green Banded Chert (Agate/Jasper)
Silicon Dioxide (SiO2) with trace impurities of Chlorite or Glauconite
sedimentary
Greenstone / Glauconitic Siltstone
Metabasalt or Glauconite-rich Sedimentary Rock
metamorphic or sedimentary
Almandine Garnet
Iron aluminum silicate - Fe3Al2(SiO4)3
metamorphic
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Sandstone (Ferruginous)
Arenite (complex silicate composition with iron oxides)
sedimentary
Tree Agate
Dendritic Agate (Silicon Dioxide, SiO2)
mineral
Petoskey Stone (Petrified Favosites)
Favosites (extinct colonial coral), CaCO3 with Silica replacement
sedimentary
Riverstone (Quartzite/Granite Cobble)
Silicon Dioxide (SiO2) based Quartzite or Silicate-rich Granite
metamorphic or igneous
Bloodstone (Heliotrope)
Silicon Dioxide (SiO2) with iron silicate and iron oxide inclusions
Mineral
Porcelain (Kaolin-based)
Alumina silicate ceramic (composed primarily of Kaolinite: Al2Si2O5(OH)4)
metamorphic (man-made/engineered)
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement
sedimentary