Biotite (Black Mica)
Biotite - K(Mg,Fe)3AlSi3O10(F,OH)2
mineral
Category
Sedimentary Or Metamorphic (Base Substrate)
Browse sedimentary or metamorphic (base substrate) specimens identified by the Rock Identifier community.
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Conglomerate (Asphaltic/Anthropogenic)
Clastic sedimentary rock / Bituminous mixture
sedimentary
Quartzite Beach Pebble
Quartzite (primarily SiO2)
metamorphic
Quartz Sand Gravel
Silicon Dioxide (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides (Goethite)
sedimentary
Banded Gneiss
Gneiss (complex metamorphic silicate rock)
metamorphic
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Ferruginous Conglomerate
Ferruginous Conglomerate (Clastic Sedimentary Rock)
sedimentary
Hematite
Iron(III) oxide (Fe2O3)
mineral
Yellow Aventurine (or Citrine-colored Quartz)
Silicon Dioxide (SiO2) with inclusions
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Ferruginous Sandstone
Arenite with Iron Oxide cement (Fe2O3 / FeO(OH))
sedimentary
Basalt
Mafic Volcanic Rock (Primarily Plagioclase Feldspar and Pyroxene)
igneous
Greenschist
Chlorite schist
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Yellow Quartzite Pebble
Quartzite (SiO2)
metamorphic
River Rock (Gneiss/Schist mix)
Foliated Metamorphic Rock (Gneiss)
metamorphic
Terrazzo (Synthetic Composite Rock)
Cementitious or Epoxy Resin-bound Aggregates
Man-made metamorphic-style composite
Almandine Garnet
Iron aluminum silicate - Fe3Al2(SiO4)3
metamorphic
Kyanite (Blue or Blue-Grey)
Kyanite (Al2SiO5)
metamorphic mineral
Gneiss
Gneiss
metamorphic
Rhodonite
Manganese Inosilicate (MnSiO3)
Mineral
Shungite
Non-crystalline carbon (high-carbon metamorphic rock)
metamorphic
Ferruginous Sandstone (Iron-rich Sandstone)
Ferruginous Arenite
sedimentary
Amber (specifically Red or Cherry Amber)
Succinite (Resinite); Chemical formula: C10H16O
Mineraloid
Gold
Native Gold (Au)
mineral
Feldspathic Gneiss (Granite Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Gneiss
Gneiss
metamorphic
Marble
Recrystallized Calcite (CaCO3) / Marble
metamorphic
Kyanite in Quartz
Kyanite (Al2SiO5) with Quartz (SiO2)
metamorphic
Gneiss
Gneiss
metamorphic
Garnet (Almandine)
Almandine (Fe3Al2(SiO4)3)
mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
Mineral
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Gneiss
Gneiss
metamorphic
Amphibolite (specifically Hornblende Schist/Gneiss)
Amphibole-rich Metamorphic Rock
metamorphic
Marble
Recrystallized Calcite / Dolomite (CaCO3)
metamorphic
Quartzite (Yellow/Orange variety)
Quartzite (primarily SiO2)
metamorphic
Granitic Gneiss
Gneiss (containing Potassium Feldspar and Quartz)
metamorphic
Gneiss
Gneiss
metamorphic