Man Made Material

Browse man made material specimens identified by the Rock Identifier community.

Quartz

SiO₂ (Silicon Dioxide)

Mineral

Citrine Quartz

Citrine (Silicon Dioxide - SiO2)

Mineral

Quartz (likely tumbled or naturally water-worn)

Quartz (SiO₂ - Silicon Dioxide)

Mineral

Quartz

Quartz (SiO₂)

Mineral

Granite

Granite (a common rock name, not a single mineral species, composed primarily of quartz, feldspar, and mica/amphibole)

igneous

Quartz

Quartz (SiO₂)

Mineral

Granite

Granite (Felsic intrusive igneous rock)

igneous

Green Calcite

Calcite (CaCO3)

mineral

Sandstone

Quartz Arenite (a type of sandstone composed of more than 90% quartz)

Sedimentary Rock

Diamond

Diamond (C)

Mineral

Chert (Flint)

Chert (microcrystalline quartz)

sedimentary

Quartz (likely)

Quartz (SiO2 - Silicon Dioxide)

Mineral

Quartzite

Quartzite (primarily SiO2)

metamorphic

Slate

Slate (a fine-grained, foliated metamorphic rock). Mineral composition: Primarily composed of mica minerals (muscovite, chlorite, sericite) and quartz, with minor amounts of hematite, pyrite, and other accessory minerals.

sedimentary

Calcite

Calcite (CaCO3)

Mineral

Quartz Geode/Druzy Quartz

Quartz (SiO₂)

Mineral

Quartz

Quartz (SiO2 - Silicon Dioxide)

Mineral

Sandstone

Sandstone (lithified sand)

sedimentary

Pyrite

Iron Pyrite (FeS₂)

Mineral

Pearl

Calcium carbonate (CaCO3) - mainly Aragonite with Conchiolin

mineraloid

Quartz (variety of colors)

SiO2 (Silicon Dioxide)

Mineral

Clear Quartz (or Rock Crystal)

Quartz (SiO₂ - Silicon Dioxide)

Mineral

Aquamarine and clear quartz

Aquamarine (Be3Al2Si6O18), Quartz (SiO2)

Mineral

Pebble (likely Quartz or Chert)

SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.

Sedimentary Rock

Synthetic Convention Badge (Plastic/PVC)

Polyvinyl Chloride (PVC) / Polycarbonate

mineraloid (synthetic)

Puddingstone (Jasper Conglomerate)

Conglomerate (specific type: Jasper Conglomerate or Hertfordshire Puddingstone)

Sedimentary

Chert (Flint)

Silicon Dioxide (SiO2)

sedimentary

Pearl

Organic gemstone (Calcium carbonate - CaCO3)

mineral

Quartz (possibly milky quartz or quartz with inclusions)

SiO2 (Silicon Dioxide)

Mineral

Quartz

Silicon Dioxide (SiO₂)

Mineral

Banded Gneiss

Gneiss (typically quartz, feldspar, mica, amphibole composition)

metamorphic

Sandstone

Arenite

sedimentary

Quartz

Silicon Dioxide (SiO2)

Mineral

Pearl

Aragonite / Calcium Carbonate (CaCO3)

mineraloid

Quartz (likely milky quartz or a stained variety)

Silicon Dioxide (SiO₂)

Mineral

Chert (often referred to as 'Jasper' when red)

Chert (microcrystalline quartz, SiO₂)

Sedimentary rock

Granite

Granite (a felsic intrusive igneous rock)

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