Sandstone (Ferruginous)
Clastic Sedimentary Rock (SiO2 with Fe2O3)
sedimentary
Category
Sedimentary (Microcrystalline Silicate)
Browse sedimentary (microcrystalline silicate) specimens identified by the Rock Identifier community.
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Sandstone (Ferruginous)
Arenite (with iron oxide cement)
sedimentary
Banded Iron Formation (BIF)
Banded Iron Formation (predominantly Hematite Fe2O3 and Magnetite Fe3O4 with Chert SiO2)
sedimentary
Green Sea Glass
Man-made silicate glass (weathered)
sedimentary
Jasper with Epidote Vein
Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate (Ca2(Al,Fe)3(SiO4)3(OH))
sedimentary
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone (Ferruginous)
Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Green Aventurine (or Xiuyan Jade / Serpentine)
Silicon Dioxide (SiO2) with Fuchsite inclusions or Magnesium Silicate
metamorphic
Coprolite
Fossilized feces (various taxa)
sedimentary
Ferruginous Sandstone
Arenite with Iron Oxide cement (Fe2O3 / FeO(OH))
sedimentary
Sandstone (Ferruginous)
Arenite (Fe2O3 rich)
sedimentary
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Common Opal
Hydrated silica (SiO2 " nH2O)
mineral
Jadeite Jade
Jadeite (Sodium Aluminum Silicate, NaAlSi₂O₆)
metamorphic
Ferruginous Sandstone (with possible trace fossils)
Arenite with Iron-Oxide Cement (SiO2 with Fe2O3)
sedimentary
Aragonite (Onyx Marble)
Calcium Carbonate (CaCO3), Orthorhombic crystal system
mineral
Weathered sandstone or limestone fragment
Likely quartz-rich sandstone or micritic limestone; exact identification requires testing
sedimentary
Jasper (Green Jasper/Chert)
Silicon Dioxide (SiO2)
sedimentary
Green Moss Agate
Agate (Silicon Dioxide - SiO2) with inclusions of hornblende or chlorite
mineral
Chert Concretion (Flint)
Silicon Dioxide (SiO2)
sedimentary
Man-made Polished Porcelain Tile (Artificial Geologic Lookalike)
Fused Silicate Ceramic with Alumina (Synthetic Kaolinite derivative)
Synthetic (Ceramic)
Polished banded iron formation (BIF)
Banded iron formation; chiefly hematite/magnetite and microcrystalline quartz (chert), with iron silicates
sedimentary
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Mica Schist with Pyrite
Muscovite/Biotite Schist (Complex Silicate)
metamorphic
Mixed pebble collection, including likely flint, quartzite, and fossil material
Varied silicate rocks; visible specimen may include chert (microcrystalline SiO₂), quartzite, and a possible fossil
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron-Oxide cement
sedimentary
Sandstone (Ferruginous)
Arenite (with Iron Oxide cement)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Dalmatian Stone
Dalmatian Jasper / Feldspathic Igneous Rock
igneous
Banded Gneiss (with Quartz Vein)
Gneiss (SiO2 and varied Silicates)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Green Calcite (often commercially called Green Onyx)
Calcium Carbonate (CaCO3)
Mineral
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Green Jasper (or Moss Agate / Prase)
Silicon Dioxide (SiO2) with chlorite or amphibole inclusions
mineral
Moss Agate
Chalcedony (SiO2) with inclusions of hornblende or chlorite
mineral
Mica / Muscovite or Biotite
Phyllosilicate mineral group (e.g., KAl2(AlSi3O10)(OH)2)
mineral
Marble
Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)
metamorphic
Sandstone with Ironstone Concretion
Arenite with Ferruginous Cement
sedimentary
Sandstone (with ripple marks)
Arenite (SiO2 primarily)
sedimentary
White Marble
Recrystallized Calcite Rock (CaCO3)
metamorphic