Mineral (Organic)

Browse mineral (organic) specimens identified by the Rock Identifier community.

Granite

Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)

igneous

Greenschist

Chlorite schist (Metamorphic rock dominated by chlorite, epidote, and actinolite)

metamorphic

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

mineral

Granite

Granite (Felsic Plutonic Rock)

igneous

Gneiss

High-grade metamorphic rock (Gneiss)

metamorphic

Granite Gneiss

Gneiss (High-grade metamorphic rock)

metamorphic

Granite

Granite (Phaneritic intrusive igneous rock)

igneous

Pegmatite (Granite Pegmatite)

Intrusive Igneous Rock (Granite Pegmatite)

igneous

Eudialyte in Matrix

Eudialyte [Na15Ca6(Fe,Mn)3Zr3(Si25O73)(O,OH,H2O)3(Cl,OH)2]

mineral

Greenschist / Chloritaform Schist

Chlorite Schist (Group of Silicate Minerals)

metamorphic

Ferruginous Quartz (River Pebble)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

mineral

Greenschist

Greenschist (Chlorite-actinolite schist)

metamorphic

Greenschist

Greenschist (composed of Chlorite, Actinolite, and Epidote)

metamorphic

Aventurine

Aventurine Quartz (SiO2 with inclusions)

metamorphic

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

mineral

Milky Quartz

Silicon Dioxide (SiO2)

mineral

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

mineral

Milky Quartz with Iron Staining and Matrix

Silicon Dioxide (SiO2)

mineral

Granite

Phaneritic Felsic Intrusive Igneous Rock

igneous

Sand (Construction Grade)

Unconsolidated siliciclastic sediment (primarily SiO2)

sedimentary

Milky Quartz

Silicon Dioxide (SiO2)

mineral

Pyrite in Quartzite/Graphite Matrix

Iron Sulfide (FeS2)

Mineral

Ironstone with Pyrite

Ferruginous Sandstone (Fe2O3) with minor Sulfide minerals (FeS2)

sedimentary

Pink Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

mineral

Schist

Mica Schist (primarily Muscovite and Biotite)

metamorphic

Schist (Micaceous Schist)

Schist (comprising Muscovite/Biotite mica, Quartz, and Feldspar)

metamorphic

Native Sulfur

Sulfur (S8)

mineral

Red Sandstone

Arenite (with Iron Oxide / Hematite cementation)

sedimentary

Greenstone / Diabase Porphyry

Porphyritic Diabase (Micro-gabbro)

Igneous

Red Coral

Corallium rubrum (for precious red coral), although other species like Corallium japonicum and Paracorallium are also used.

Organic Gemstone (not a rock or mineral in the traditional sense, but bio-mineralized material)

Diorite

Diorite (Intermediate intrusive igneous rock)

igneous

Concretion

Various mineral compositions, typically carbonate or iron oxide cemented sediment

Sedimentary

Quartz / Quartzite

Silicon Dioxide (SiO2)

Metamorphic or Mineral

Jasper (Iron-stained Quartzite/Chert)

Silicon Dioxide (SiO2) with iron oxide inclusions

Sedimentary

Fluorite

Calcium Fluoride (CaF2)

mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

mineral

Milky Quartz

Silicon Dioxide (SiO2)

mineral

Concretion or Geode (unbroken)

Varied (depending on mineral composition and cementing agent). For quartz-lined geodes, the scientific name of the dominant mineral would be Quartz (SiO2). For calcite-lined geodes, Calcite (CaCO3). Concretions are often composed of cryptocrystalline quartz (chert), calcite, or iron oxides.

Sedimentary rock (specifically a concretion or possibly a geode)