Man Made

Browse man made specimens identified by the Rock Identifier community.

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Opalite

Goldstone

Blue Goldstone

Zincite

Map Jasper

Mandarin Garnet

Andalusite

Marl

Dunite

Coquina

Dalmatian Jasper

Chalk

Basalt with Quartz Vein

Basaltic rock with hydrothermal SiO2 filling

igneous

Basalt

Mafic Igneous Rock (composed primarily of Plagioclase and Pyroxene)

igneous

Sandstone

Arenite (primarily SiO2)

sedimentary

Greenstone

Metabasalt / Greenschist facies rock

Metamorphic

Limestone

Limestone (Calcium Carbonate - CaCO3)

sedimentary

Chert (Yellow Jasper variant)

Microcrystalline or cryptocrystalline Quartz (SiO2)

sedimentary

Unakite

Unakite (Epidotized Granite)

metamorphic

Rhodochrosite

Manganese Carbonate (MnCO3)

mineral

Silver (Sterling Silver Jewelry)

Argentum (Ag) mixed with Copper (Cu)

mineral

Brown Jasper

Jasper (a cryptocrystalline variety of Quartz, SiO2)

Mineral, specifically a variety of Quartz

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

mineral

Limestone

Sedimentary Rock (Calcium Carbonate, CaCO3)

sedimentary

Chert (Flint Pebbles)

Microcrystalline Quartz (SiO2)

sedimentary

Gold Nugget

Native Gold (Au)

mineral

Granite

Granite (composed primarily of Quartz (SiO2), Alkali Feldspar, and Plagioclase)

igneous

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

mineral

Granite

Granite (Felsic intrusive igneous rock)

igneous

Amethyst

Silicon dioxide (SiO2) with iron impurities

mineral

Scoria

Vesicular Basalt / Scoria

igneous

Vesicular Basalt

Extrusive Mafic Igneous Rock (Vesicular Basalt)

igneous

Iron Slag (Industrial Byproduct)

Anthropogenic pyrometallurgical residue

mineral

Granite

igneous

Red Jasper (Chert)

Silicon Dioxide (SiO2) with iron oxide inclusions

sedimentary

Milky Quartz with Inclusions

Silicon Dioxide (SiO2)

mineral

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

metamorphic

Quartz (likely a form of massive or vein quartz)

Quartz (SiO₂)

Mineral

Sandstone (with Iron Oxide staining)

Arenite (primarily SiO2 with Fe2O3 staining)

sedimentary

Scoria (Red Lava Rock)

Scoria

igneous

Peridot

Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4

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