Milky Quartz
Silicon Dioxide (SiO2)
mineral
Category
Sedimentary Or Metamorphic (Base Substrate)
Browse sedimentary or metamorphic (base substrate) specimens identified by the Rock Identifier community.
Learn about Sedimentary Or Metamorphic (Base Substrate) in the encyclopedia
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Garnet in Schist (Polished Tower)
Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist
metamorphic
Chert
Chert (SiO2, Silicon Dioxide)
sedimentary
Chert (Field Stone)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (White Variety)
Microcrystalline Quartz (SiO2)
sedimentary
Breccia
Clastic Breccia (General mineral composition depends on fragments, often SiO2 or CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (Smooth River Siltstone/Basalt variant)
Silicon dioxide (SiO2) / Microcrystalline Quartz
sedimentary
Sandstone (likely Ferruginous)
Arenite (SiO2 based with Fe2O3/FeO(OH) cement)
sedimentary
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Quartzite
Metamorphic Quartzite (primarily SiO2)
metamorphic
Glauconitic Sandstone (Greensand pebble)
Glauconitic Quartz Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Bauxite
Alumina-rich rock (consisting of Gibbsite, Boehmite, and Diaspore)
sedimentary
Banded Calcite (often sold as 'Mexican Onyx' or 'Calcite Onyx')
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Jasper and Yellow Chert (Tumbled)
Microcrystalline Quartz (SiO2)
sedimentary
Banded gneiss pebble
Gneiss, commonly quartz–feldspar–mica gneiss
metamorphic
Mica Schist (Garnetiferous)
Garnet-Mica Schist
metamorphic
Gneiss
Gneiss (Metamorphic high-grade)
metamorphic
Chert (and Chert-based Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Sedimentary
Wallboard/Drywall (Gypsum-based)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
sedimentary
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Dalmatian Stone
Dalmatian Jasper (a misnomer) / Perthitic Igneous Rock
igneous
Quartz (Milky or Cloudy Quartz)
Silicon Dioxide (SiO2)
mineral
Weathered foliated metamorphic rock, likely gneiss or schist
Quartz–feldspar–mica metamorphic rock; exact identification requires a fresh surface and mineral tests
metamorphic
Quartz-veined Metamorphic Pebble
Silicate-rich metamorphic rock with quartz veins (SiO2)
metamorphic
Lepidolite
K(Li,Al)3(Si,Al)4O10(F,OH)2
Mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Hoodoo (Limestone / Siltstone Formation)
Claron Formation (Sedimentary Rock - Limestone, Mudstone, Dolomite)
sedimentary
Biotite (Black Mica)
Biotite - K(Mg,Fe)3AlSi3O10(F,OH)2
mineral
Quartz
Silicon Dioxide (SiO2)
Mineral
Diorite
Diorite
igneous
Terrazzo (Synthetic Composite Rock)
Cementitious or Epoxy Resin-bound Aggregates
Man-made metamorphic-style composite
Garnet in Quartz Matrix
Almandine Garnet (Fe3Al2(SiO4)3) in Quartz (SiO2)
metamorphic
Fuchsite (Green Muscovite / Mica Schist)
Chromian Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Limestone (specifically Fossiliferous or Crinoidal Limestone)
Calcium Carbonate (CaCO3) - Calcite Rock
sedimentary
Banded Gneiss
Gneiss (Metamorphic rock)
metamorphic
Gneiss
Foliated Metamorphic Gneiss
metamorphic
Quartzite with Sandstone/Iron staining
Metamorphic Quartzite (SiO2)
metamorphic
Almandine Garnet in Schist
Almandine, Fe3Al2(SiO4)3
metamorphic
Chert
Microcrystalline Quartz (SiO2)
sedimentary