Schist
Schist (various mineralogical compositions including mica, chlorite, talc, etc.)
Metamorphic
Category
Sedimentary And Igneous (Mixed)
Browse sedimentary and igneous (mixed) specimens identified by the Rock Identifier community.
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Quartz (Float/Abraded)
Quartz (SiO₂)
Mineral
Pyrite
Iron Pyrite (FeS2)
mineral
Quartz (on matrix)
Quartz (Silicon Dioxide, SiO₂)
Mineral
Marble
Marbles are primarily composed of calcite (calcium carbonate, CaCO3) or dolomite (calcium magnesium carbonate, CaMg(CO3)2).
Metamorphic Rock
Smoky Quartz
SiO2 (Silicon Dioxide)
Mineral
Yellow Chalcedony
Chalcedony (a cryptocrystalline variety of Quartz, SiO₂)
Mineral
Calcite
Calcite (CaCO₃, Calcium Carbonate)
Mineral
Amethyst
Quartz (SiO2) variety
Mineral
Gold
Aurum (Elemental Gold, Au)
Mineral, Metal (element)
Epidote (or Epidote-rich rock)
Epidote. Mineral formula: Ca2(Al,Fe)3(SiO4)3(OH).
Mineral, often found in metamorphic rocks but also in sedimentary and igneous rocks
Jasper (specifically Polychrome or Desert Jasper)
Silicon Dioxide (SiO2) with impurities
sedimentary or igneous-associated mineral
Milky Quartz
Quartz (SiO₂)
Mineral
Greenschist
Greenschist facies rock
Metamorphic
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock
Carnelian
Chalcedony (cryptocrystalline quartz), SiO2
Mineral
Tiger’s eye
Quartz variety, primarily silicon dioxide (SiO₂); fibrous quartz pseudomorph after crocidolite asbestos
gemstone
Orange Calcite
Calcite (Calcium Carbonate, CaCO3)
Mineral
Quartz (Crystal/Druzy Quartz)
Quartz (SiO₂)
Mineral
Banded River Rock / Gneiss (highly weathered)
Gneiss
Metamorphic rock
Quartz (likely)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Quartz Geode (with Agate banding)
Silicon Dioxide (SiO2)
Sedimentary or Igneous (secondary formation)
Veined Pebble (likely a Quartz-Veined Pebble)
Pebble with Mineral Vein (e.g., Quartz Vein in a Chert/Mudstone Pebble)
Sedimentary Rock (possibly conglomerate or breccia with a quartz vein)
Green Aventurine
Aventurine (Silicon dioxide, SiO₂)
Mineral; variety of Quartz
Calcite
Calcite (Mineral, Calcium Carbonate - CaCO3)
Mineral
Banded Agate (variety of Chalcedony)
Agate (SiO2)
mineral
Quartz
Quartz (SiO2)
Mineral
Granite Gneiss
Gneiss (derived from granitic protolith)
metamorphic
Banded Gneiss
Gneiss (pronounced "nice")
metamorphic
Gneiss
Gneiss (a type of metamorphic rock)
Metamorphic Rock
Orange Calcite
Calcite (CaCO3)
Mineral
Diorite (possibly fine-grained variety or a related intermediate intrusive rock like a felsic gabbro or a dark granodiorite)
Diorite (Igneous rock, intrusive, intermediate composition)
Igneous Rock
Magnetic Hematite
Magnetized Hematite (an iron oxide mineral, Fe2O3, that has undergone magnetization)
Mineral
Pyrite
Pyrite (Iron sulfide, FeS₂)
mineral
Crushed Stone / Gravel (Multiple Rock Types)
Lithic fragments (undifferentiated)
Igneous, Sedimentary, and Metamorphic mix
Calcite
Calcite (CaCO3)
Mineral
Quartzite
Quartzite (primarily composed of SiO O₂)
Sedimentary Rock
Red Chalcedony (likely dyed)
Chalcedony (a variety of Quartz), SiO2
Mineral (Cryptocrystalline Quartz)
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
Mineral
Quartz
Silicon Dioxide (SiO₂)
Mineral
Quartz Geode/Druzy Quartz
Quartz (SiO₂)
Mineral
Included Quartz Beads (likely Phantom Quartz or Garden Quartz)
Quartz (SiO2) with various mineral inclusions
Mineral