Igneous, Sedimentary, And Metamorphic Mix

Browse igneous, sedimentary, and metamorphic mix specimens identified by the Rock Identifier community.

Coal (Anthracite)

Anthracite (Carbon-based organic sedimentary/metamorphic rock)

metamorphic

Quartzite Pebble (River Rock)

Metamorphic Quartzite (predominantly SiO2)

metamorphic

Calcite (Optical or Clear Calcite)

Calcium Carbonate (CaCO3)

mineral

Pyrite

Iron Sulfide (FeS2)

mineral

Potassium Feldspar and Quartz

KAlSi3O8 (Potassium Feldspar) and SiO2 (Quartz)

mineral

Chalcedony (Agate/Quartz)

Silicon Dioxide (SiO2)

mineral

Marble

Recrystallized Calcite (CaCO3)

metamorphic

Yellow Quartzite (Onyx Pebble)

Silicon Dioxide (SiO2) - Quartzite

metamorphic

Dyed Agate

Silicon Dioxide with artificial pigment (SiO2)

sedimentary

Mica Schist

Mica Schist (primarily Muscovite and Biotite KAl2(AlSi3O10)(OH)2)

metamorphic

Adventurine (Green)

Silicon Dioxide (SiO2) with inclusions of Fuchsite

metamorphic

Yellow Quartzite (River Stone)

Quartzite (primarily SiO2)

metamorphic

Anthracite Coal

Anthracite (Carbon Content: 86%-97%)

metamorphic

Marble

Recrystallized Calcite (CaCO3)

metamorphic

Mica Schist

Mica Schist (Schistose metamorphic rock rich in Muscovite/Biotite)

metamorphic

Pink Thulite

Thulite (Ca2Al3(SiO4)3(OH)) - Pink Zoisite

Mineral

Pyrite

Iron Sulfide (FeS2)

mineral

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

sedimentary

Mica Schist

Mica Schist (Composition typically contains Muscovite: KAl2(AlSi3O10)(OH)2 or Biotite: K(Mg,Fe)3AlSi3O10(OH)2 along with Quartz and Feldspar)

metamorphic

Quartzite

Quartzite (primarily SiO2)

metamorphic

Marble

Metamorphosed Limestone (CaCO3)

metamorphic

Iron-stained Quartzite / Chert

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

metamorphic

Quartzite with Iron Banding

Metamorphosed Quartz-rich Sandstone (SiO2 with Fe2O3 inclusions)

metamorphic

Moonstone

Orthoclase (Potassium Aluminum Silicate, KAlSi3O8) with inclusions of Albite

mineral

Smoky Quartz on Matrix

Crystalline Silicon Dioxide (SiO2)

mineral

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

mineral

Quartz Pebble

Silicon Dioxide (SiO2)

mineral

Smoky Quartz

Silicon Dioxide (SiO2)

mineral

Pyrite on Quartz

Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)

mineral

Chrysocolla

Hydrated copper phyllosilicate, Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O)

mineral

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

mineral

Yellow Quartz (Citrine/Lemon Quartz)

Silicon Dioxide (SiO2)

mineral

Quartz Pebble

Silicon Dioxide (SiO2)

mineral

Blue Quartz with Dumortierite/Magnesio-riebeckite inclusions

Quartz (SiO2) containing Dumortierite (Al7(BO3)(SiO4)3O3)

igneous/metamorphic

Quartz Pebble (Sea Glass-like Quartz)

Quartz (Silicon Dioxide - SiO2)

mineral

Citrine Quartz

Silicon Dioxide (SiO2)

mineral

Dalmatian Stone (Dalmatian Jasper)

Peralkaline Quartz-Feldspar Rock with Arfvedsonite

igneous

Pebble (likely a type of sandstone or quartzite pebble)

Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.

Sedimentary rock