Mineralogical Specimen

Browse mineralogical specimen specimens identified by the Rock Identifier community.

Banded River Rock / Gneiss (highly weathered)

Gneiss

Metamorphic rock

Porphyritic Rhyolite or Andesite (Porphyry)

Porphyritic igneous rock (Composition depends on exact mineralogy, often Rhyolite or Andesite)

igneous

Brick

Fired clay or Ceramic material (no specific mineralogical scientific name as it's a composite)

Man-made material (constructed)

Sugilite

Sugilite (KNa2(Fe,Mn,Al)2Li3Si12O30)

Mineral

Pegmatite (likely Granitic Pegmatite)

Pegmatite (a coarse-grained igneous rock, often with granitic composition)

igneous

Sandstone

Quartz Arenite (a common type of sandstone, given the appearance), Arkose, Greywacke (depending on mineralogy)

Sedimentary Rock

Greisen

Metamorphic

Granite (likely a river or beach pebble)

Granite (a felsic intrusive igneous rock primarily composed of quartz, feldspar, and mica)

Igneous

Banded Gneiss

Gneiss (pronounced 'nice')

metamorphic

N/A

This image does not display a rock, mineral, or geological specimen. It shows a human hand wearing a ring.

Not a geological specimen

N/A (man-made object)

N/A

Unable to Identify (Image Obscured)

Indeterminate

Fossilized Bivalve Shell

Bivalvia (fossil specimen)

sedimentary

Painted River Rock

Anthropogenic-modified Siliciclastic Sedimentary Rock

Sedimentary

Note on Image Identification: Textile

N/A (Anthropogenic material)

not a rock

Gold Ore in Quartz

Auriferous Quartz (Au + SiO2)

igneous

Geodal Limestone / Calcite Druze

Calcium Carbonate (CaCO3)

sedimentary

Echinoidea (Fossil Sea Urchin)

Echinodermata Echinoidea

sedimentary

Note: No specimen visible

N/A

Lemon (Mock specimen mimicking Citrine/Sulfur)

Citrus x limon

Organic (Biological specimen)

Quartz Vein in Schist

Quartz (SiO2) in Mica Schist

metamorphic

Quartz Geode with Calcite

Silicon Dioxide (SiO2) and Calcium Carbonate (CaCO3)

Mineral/Geode

Human Skin (Epidermis/Dermis)

Integumentary tissue (High content of hydroxyapatite in bones, though the surface is biological)

Mineral-like biological tissue

Note: Item is not a geological specimen

n/a

none

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