Mineral (Impactite)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

mineral

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

mineral

Milky Quartz with Iron Staining and Matrix

Silicon Dioxide (SiO2)

mineral

Pyrite in Quartzite/Graphite Matrix

Iron Sulfide (FeS2)

Mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

Diorite

Diorite (Intermediate intrusive igneous rock)

igneous

Schist

Schist (Crystalline metamorphic rock)

metamorphic

Native Sulfur

Sulfur (S8)

mineral

Red Sandstone

Arenite (with Iron Oxide / Hematite cementation)

sedimentary

Greenstone / Diabase Porphyry

Porphyritic Diabase (Micro-gabbro)

Igneous

Pegmatite

Granitic Pegmatite

igneous

Concretion

Various mineral compositions, typically carbonate or iron oxide cemented sediment

Sedimentary

Fossilized Sand Tiger Shark Tooth

Carcharias taurus / Striatolamia macrota (mineralized as Hydroxylapatite/Francolite)

sedimentary (fossil)

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

Pearl (nacre)

Calcium Carbonate (mostly CaCO3 as Aragonite) and Conchiolin

Organic Mineraloid

Milky Quartz

Silicon Dioxide (SiO2)

mineral

Ferruginous Sandstone (Gozzan/Ironstone)

Arenite with Limonite/Goethite cement (FeO(OH)·nH2O)

sedimentary

Basalt

Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

igneous

Pyrite

Iron Disulfide (FeS2)

mineral

Sandstone

Arenite (composed mainly of SiO2)

sedimentary

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

mineral

Sandstone

Sandstone (Sedimentary rock composed of silicate grains)

sedimentary

Pink Lepidolite

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

mineral

Amber

Succinite (fossilized tree resin), C10H16O

Organic Gemstone

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

mineral

Pyrite

Iron Sulfide (FeS2)

mineral

Sandstone

Arenite (SiO2 predominantly)

sedimentary

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)