Sandstone (Banded)
Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide staining)
sedimentary
Category
Sedimentary (Microcrystalline Silicate)
Browse sedimentary (microcrystalline silicate) specimens identified by the Rock Identifier community.
Rhodonite
Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3
mineral
Sandstone
Arenite
sedimentary
Concrete
Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)
sedimentary (anthropogenic / man-made)
Sandstone
Arenite (primarily SiO2)
sedimentary
Green Common Opal
Hydrated Silica (SiO2·nH2O)
mineral
Gneiss (High-grade Metamorphic Rock)
Gneiss (Metamorphic silicate rock)
metamorphic
Jasper with Epidote
Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate (Ca2(Al,Fe)3(SiO4)3(OH))
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
sedimentary
Limonite (Ironstone Concretion)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Banded Calcite (often sold as Onyx Marble)
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Limonite (Iron Ore)
Limonite (unstructured hydrated iron(III) oxide-hydroxides, often FeO(OH)·nH2O)
mineral
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Mookaite Jasper
Radiolarite (Silica-rich sedimentary rock featuring Hematite and Goethite)
sedimentary
Aragonite (Banded Calcite / 'Mexican Onyx')
Aragonite (Calcium Carbonate - CaCO3)
mineral
Kaolinite (Chalky Clay)
Kaolinite (Al2Si2O5(OH)4)
sedimentary
Sandstone (with Iron Oxide staining)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Sandstone
Arenite
sedimentary
Kyanite (within Quartz)
Kyanite (Al2SiO5) in crystalline Quartz base (SiO2)
metamorphic
Sandstone
Arenite
sedimentary
Cream Marble (Speckled)
Metamorphosed Limestone (mainly CaCO3)
metamorphic
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
Sandstone (Ferruginous)
Arenite with Iron oxide staining (SiO2 with Fe2O3)
sedimentary
Bauxite
Bauxite (Al(OH)3, γ-AlO(OH), and α-AlO(OH))
sedimentary
Gneiss (specifically a weathered Amphibolite or Garnet Gneiss)
Gneiss (complex silicate composition)
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
Banded Gneiss
Gneiss (complex metamorphic silicate rock)
metamorphic
Ferrous Slag
Fused calcium-iron silicates (Industrial Slag)
Anthropogenic/Industrial byproduct
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (with iron oxide cement)
sedimentary
Common Opal
Hydrated silica (SiO2 " nH2O)
mineral
Sandstone (Ferruginous)
Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Ferruginous Sandstone (with possible trace fossils)
Arenite with Iron-Oxide Cement (SiO2 with Fe2O3)
sedimentary
Bauxite
Bauxite (Al(OH)3, AlO(OH))
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Terracotta (Man-made ceramic brick fragment)
Baked clay / High-iron ceramic (Silicate-based ceramic)
Anthropogenic material (Man-made sedimentary mimic)
Serpentine (Nephrite-like River Cobble)
Serpentinite (Hydrous Magnesium Iron Silicate)
metamorphic
Glauconitic Sandstone
Glauconitic Sandstone (Greensand)
sedimentary
Aragonite (Onyx Marble)
Calcium Carbonate (CaCO3), Orthorhombic crystal system
mineral
White Marble
Metamorphosed Limestone (principally CaCO3)
metamorphic