Rock Identifier

Category

Mineraloid (Human Made Geological Specimen)

Browse mineraloid (human made geological specimen) specimens identified by the Rock Identifier community.

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Bull Quartz (Milky Quartz) (Silicon Dioxide (SiO2)) — mineral

Bull Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Granodiorite (Riverbed Cobble) (Granodiorite) — igneous

Granodiorite (Riverbed Cobble)

Granodiorite

Blue calcite (likely) (Calcite, CaCO₃) — mineral

Blue calcite (likely)

Calcite, CaCO₃

Tumbled banded sandstone pebble (Quartz-rich sandstone (chiefly SiO₂), likely iron-oxide-stained) — sedimentary

Tumbled banded sandstone pebble

Quartz-rich sandstone (chiefly SiO₂), likely iron-oxide-stained

Red Jasper (Jasper (Silicon Dioxide, SiO2 with Iron Oxide impurities)) — sedimentary

Red Jasper

Jasper (Silicon Dioxide, SiO2 with Iron Oxide impurities)

Jasper (Silicon dioxide (SiO2)) — sedimentary

Jasper

Silicon dioxide (SiO2)

Amethyst/Smoky Quartz Cluster (Silicon Dioxide (SiO2)) — mineral

Amethyst/Smoky Quartz Cluster

Silicon Dioxide (SiO2)

Unidentified weathered rock fragments (Likely mixed silicate rocks; specific identification requires testing) — mineral

Unidentified weathered rock fragments

Likely mixed silicate rocks; specific identification requires testing

Rough Quartz (Iron-stained) (Silicon Dioxide (SiO2)) — mineral

Rough Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Fossilized shell fragment (Indeterminate fossil mollusk; likely a silicified or mineral-replaced bivalve/gastropod fragment) — fossil

Fossilized shell fragment

Indeterminate fossil mollusk; likely a silicified or mineral-replaced bivalve/gastropod fragment

Moss Agate (Silicon Dioxide (SiO2) with Manganese or Iron Oxide inclusions) — mineral

Moss Agate

Silicon Dioxide (SiO2) with Manganese or Iron Oxide inclusions

Chert (Chalcedony/Flint) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Chalcedony/Flint)

Microcrystalline Quartz (SiO2)

Quartz (Silicon Dioxide (SiO₂)) — Mineral

Quartz

Silicon Dioxide (SiO₂)

Slag (Industrial Glass Slag) (Amorphous Silica / Ferro-silicate Slag) — mineraloid / anthropogenic

Slag (Industrial Glass Slag)

Amorphous Silica / Ferro-silicate Slag

mineraloid / anthropogenic

Red Amber (Burmite/Cherry Amber) (Succinite / Retinite (Organic Fossilized Resin, C10H16O)) — Mineraloid (Organic)

Red Amber (Burmite/Cherry Amber)

Succinite / Retinite (Organic Fossilized Resin, C10H16O)

Mineraloid (Organic)

Nephrite Jade (Ca2(Mg,Fe)5Si8O22(OH)2) — metamorphic

Nephrite Jade

Ca2(Mg,Fe)5Si8O22(OH)2

Diabase (Dolerite) (Diabase or Dolerite) — igneous

Diabase (Dolerite)

Diabase or Dolerite

Basalt (Basalt) — igneous

Basalt

Basalt

Pink Granite (Crystalline Granite) (Igneous Intrusive Rock (Felsic Plutonic)) — igneous

Pink Granite (Crystalline Granite)

Igneous Intrusive Rock (Felsic Plutonic)

Jasper (Silicon Dioxide (SiO2) with impurities) — sedimentary

Jasper

Silicon Dioxide (SiO2) with impurities

Amethyst (Amethyst (Silicon Dioxide, SiO2)) — mineral

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Milky quartz (quartz-rich rock) (Quartz, silicon dioxide (SiO₂); likely massive quartz with minor iron-stained impurities) — mineral

Milky quartz (quartz-rich rock)

Quartz, silicon dioxide (SiO₂); likely massive quartz with minor iron-stained impurities

Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Chert (Honey Chert / Flint) (Silicon Dioxide (SiO2) - Cryptocrystalline Quartz) — sedimentary

Chert (Honey Chert / Flint)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Weathered quartz-rich pebble (Mostly microcrystalline quartz (SiO₂), possibly quartzite or chalcedony with iron-oxide staining) — mineral

Weathered quartz-rich pebble

Mostly microcrystalline quartz (SiO₂), possibly quartzite or chalcedony with iron-oxide staining

Chert (Nodular Flint) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Nodular Flint)

Microcrystalline Quartz (SiO2)

Agate (Plume or Moss Agate variant) (Chalcedony (SiO2) with various inclusions) — mineral

Agate (Plume or Moss Agate variant)

Chalcedony (SiO2) with various inclusions

Clear Quartz (Rock Crystal) (Silicon Dioxide (SiO2)) — mineral

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz Crystal Cluster (Quartz (Silicon Dioxide, SiO2)) — mineral

Quartz Crystal Cluster

Quartz (Silicon Dioxide, SiO2)

Tumbled amber-like chalcedony or resinous fossil material (Likely chalcedony (microcrystalline SiO₂), though the appearance could also indicate copal/amber) — gemstone

Tumbled amber-like chalcedony or resinous fossil material

Likely chalcedony (microcrystalline SiO₂), though the appearance could also indicate copal/amber

Amber (Succinite (specifically for Baltic amber); approximate formula C10H16O) — organic mineraloid

Amber

Succinite (specifically for Baltic amber); approximate formula C10H16O

organic mineraloid

Amber (Succinite (specific to Baltic amber), fossilized tree resin) — Organic Mineraloid

Amber

Succinite (specific to Baltic amber), fossilized tree resin

Organic Mineraloid

Chert / Flint Nodular Fragment (Microcrystalline quartz (SiO2)) — sedimentary

Chert / Flint Nodular Fragment

Microcrystalline quartz (SiO2)

Milky Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Chert (Flint) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Flint)

Microcrystalline Quartz (SiO2)

Weathered iron-rich concretion or laterite fragment (Ferruginous concretion, likely goethite/limonite (hydrated iron oxides) in a clay-rich matrix) — sedimentary

Weathered iron-rich concretion or laterite fragment

Ferruginous concretion, likely goethite/limonite (hydrated iron oxides) in a clay-rich matrix

Biotite schist (probable mica schist) (Mica schist; chiefly quartz, biotite mica, and feldspar) — metamorphic

Biotite schist (probable mica schist)

Mica schist; chiefly quartz, biotite mica, and feldspar

Porphyritic Basalt (Drill Core) (Porphyritic Basalt with Plagioclase Phenocrysts) — igneous

Porphyritic Basalt (Drill Core)

Porphyritic Basalt with Plagioclase Phenocrysts

Milky Quartz with Iron Staining (Silicon Dioxide (SiO2)) — mineral

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Granite (Granite (Plutonic Igneous Rock)) — igneous

Granite

Granite (Plutonic Igneous Rock)