Mineral (Man Modified)

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

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

metamorphic

Sodalite

Sodalite (Na8Al6Si6O24Cl2)

mineral

Quartz (Rock Crystal) with minor impurities

Quartz (SiO2)

Mineral

Limonite (with goethite)

Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)

mineral

Citrine or Yellow Quartz

Silicon Dioxide (SiO2) with iron impurities

mineral

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

mineral

Gold Nugget

Native Gold (Au)

mineral

Granite with Epidote

Granite, containing quartz, feldspar, and epidote

Igneous

Sandstone

Sandstone (arenite is a more specific geological term for a clean sandstone, while wacke refers to a dirty sandstone with significant matrix)

Sedimentary

Fluorite

Calcium fluoride (CaF2)

mineral

Fossilized Coral (Petoskey Stone or Rugose Coral)

Antophyllum (Hexagonaria) or Scleractinia (CaCO3)

sedimentary

Sandstone (Pebble/Conglomerate fragment)

Sandstone (clastic sedimentary rock)

Sedimentary Rock

Tufa (Vesicular Limestone)

Tufa (form of Calcium Carbonate, CaCO3)

sedimentary

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

mineral

Peacock Ore

Bornite (Cu5FeS4)

mineral

Gold Nugget

Native Gold (Au)

mineral

Limonite / Ironstone Nodule

Limonite (Hydrated iron(III) oxide-hydroxide), FeO(OH)·nH2O

mineral

Sandstone

Arenite (composed primarily of SiO2)

sedimentary

Milky Quartz

Silicon Dioxide (SiO2)

mineral

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

Basalt

Basalt (Aphanitic Mafic Volcanic Rock)

Igneous

Sandstone (Quartzite-rich)

Clastic sedimentary rock (primarily SiO2)

sedimentary

Pink Feldspar (Orthoclase)

Orthoclase Feldspar (KAlSi3O8)

mineral

Quartz (Crystal Point/Fragment)

Silicon Dioxide (SiO2)

mineral

Rough Quartz (likely Milky or Smoky Quartz)

Silicon Dioxide (SiO2)

mineral

Sandstone (likely Ferruginous)

Arenite (SiO2 with iron oxide impurities)

sedimentary

Fluorite

Calcium Fluoride (CaF2)

mineral

Quartz (likely milky/rose quartz variety)

Quartz (SiO2 - Silicon Dioxide)

Mineral

Hematite (Iron Ore)

Hematite (Fe2O3)

mineral

Greywacke (likely)

Greywacke (a type of sandstone)

Sedimentary

Rainbow Fluorite

Calcium Fluoride (CaF2)

mineral

Fluorite

Fluorite (Calcium Fluoride - CaF2)

mineral

Limonite

Limonite (FeOO·nH2O)

mineral

Native Copper

Native Copper (Cu)

mineral

Granite

Granite (a common rock type, not a single mineral; composed primarily of Quartz, Feldspar (Orthoclase and Plagioclase), and Mica (Biotite and/or Muscovite) and/or Amphibole)

Igneous