Rock Identifier

Category

Mineraloid (Human Made Geological Specimen)

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

Small white mineral fragment (Indeterminate; possibly quartz, calcite, or feldspar) — mineral

Small white mineral fragment

Indeterminate; possibly quartz, calcite, or feldspar

Quartz (Vein Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Chert with Quartz Vein (Microcrystalline Quartz (SiO2) with Macrocrystalline Quartz) — sedimentary

Chert with Quartz Vein

Microcrystalline Quartz (SiO2) with Macrocrystalline Quartz

Banded mica schist (Mica schist, chiefly muscovite/biotite with quartz and feldspar) — metamorphic

Banded mica schist

Mica schist, chiefly muscovite/biotite with quartz and feldspar

Pyrite in Matrix (Fool's Gold) (Iron Sulfide (FeS2)) — mineral

Pyrite in Matrix (Fool's Gold)

Iron Sulfide (FeS2)

Purpurite (Manganese Iron Phosphate, Mn3+(PO4)) — mineral

Purpurite

Manganese Iron Phosphate, Mn3+(PO4)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Azurite Malachite (Mixed) (Azurite-Malachite; Azurite: Cu3(CO3)2(OH)2 / Malachite: Cu2CO3(OH)2) — mineral

Azurite Malachite (Mixed)

Azurite-Malachite; Azurite: Cu3(CO3)2(OH)2 / Malachite: Cu2CO3(OH)2

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

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Sandstone (Arenite (SiO2 dominant)) — sedimentary

Sandstone

Arenite (SiO2 dominant)

Orange Calcite (Calcite (Calcium Carbonate - CaCO3)) — mineral

Orange Calcite

Calcite (Calcium Carbonate - CaCO3)

Yellow Quartz (possibly dyed) (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz (possibly dyed)

Silicon Dioxide (SiO2)

Rhyolite (Rhyolite (High-silica volcanic rock)) — igneous

Rhyolite

Rhyolite (High-silica volcanic rock)

Reddish-brown rounded pebble, likely iron-stained sandstone or chert (Probable quartz-rich sandstone (SiO₂), possibly ferruginous chert; exact identification requires testing) — sedimentary

Reddish-brown rounded pebble, likely iron-stained sandstone or chert

Probable quartz-rich sandstone (SiO₂), possibly ferruginous chert; exact identification requires testing

Weathered graywacke or sandstone cobble (Lithic/feldspathic sandstone; exact identification requires a fresh break or thin section) — sedimentary

Weathered graywacke or sandstone cobble

Lithic/feldspathic sandstone; exact identification requires a fresh break or thin section

Red Jasper (Jasper (Microcrystalline Quartz, SiO2)) — sedimentary

Red Jasper

Jasper (Microcrystalline Quartz, SiO2)

Clear Quartz (Tumbled) (Silicon Dioxide (SiO2)) — mineral

Clear Quartz (Tumbled)

Silicon Dioxide (SiO2)

Ferruginous Quartz (Silicon Dioxide (SiO2) with Iron Oxide inclusions) — Mineral

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Honey Calcite (Calcium Carbonate (CaCO3)) — mineral

Honey Calcite

Calcium Carbonate (CaCO3)

Quartzite (Metamorphic Quartzite (SiO2)) — metamorphic

Quartzite

Metamorphic Quartzite (SiO2)

Diamond (Heart Cut) (Carbon (C)) — gemstone

Diamond (Heart Cut)

Carbon (C)

Quartz (Milky/Common) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Green Fluorite (Calcium Fluoride (CaF2)) — mineral

Green Fluorite

Calcium Fluoride (CaF2)

Himalayan Salt (Halite (mineral name), chemical formula NaCl (sodium chloride). Generally, 'Himalayan Salt' is a trade name for evaporite minerals from specific regions.) — Mineral

Himalayan Salt

Halite (mineral name), chemical formula NaCl (sodium chloride). Generally, 'Himalayan Salt' is a trade name for evaporite minerals from specific regions.

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Pyrite (Fool's Gold) (Iron Disulfide (FeS2)) — mineral

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Gold-bearing quartz vein specimen (Native gold (Au) in quartz (SiO₂), likely with iron-oxide staining) — mineral

Gold-bearing quartz vein specimen

Native gold (Au) in quartz (SiO₂), likely with iron-oxide staining

Quartz in Host Rock (Silicon Dioxide (SiO2) in Rhyolite or Granite matrix) — igneous

Quartz in Host Rock

Silicon Dioxide (SiO2) in Rhyolite or Granite matrix

Quartz with Schist Inclusion (Crystalline Silicon Dioxide (SiO2) with Muscovite/Biotite Schist) — metamorphic

Quartz with Schist Inclusion

Crystalline Silicon Dioxide (SiO2) with Muscovite/Biotite Schist

Granite (Granite (Mainly Quartz SiO2, Feldspar KAlSi3O8, and Mica KAl2(AlSi3O10)(OH)2)) — Igneous

Granite

Granite (Mainly Quartz SiO2, Feldspar KAlSi3O8, and Mica KAl2(AlSi3O10)(OH)2)

Chert Arrowhead (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Arrowhead

Microcrystalline Quartz (SiO2)

Carnelian Agate (Silicon Dioxide (SiO2) with iron oxide impurities) — mineral

Carnelian Agate

Silicon Dioxide (SiO2) with iron oxide impurities

Sandstone (Quartzose) (Arenite (primarily SiO2)) — sedimentary

Sandstone (Quartzose)

Arenite (primarily SiO2)

Foliated metamorphic rock, likely biotite schist (Mica schist, chiefly quartz, feldspar, and biotite mica) — metamorphic

Foliated metamorphic rock, likely biotite schist

Mica schist, chiefly quartz, feldspar, and biotite mica

Chert Nodule (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Nodule

Microcrystalline Quartz (SiO2)

Quartz (Fieldstone/Pebble) (Silicon Dioxide (SiO2)) — mineral

Quartz (Fieldstone/Pebble)

Silicon Dioxide (SiO2)

Amethyst (Faceted) (Amethyst (Silicon Dioxide with iron impurities, SiO2)) — mineral

Amethyst (Faceted)

Amethyst (Silicon Dioxide with iron impurities, SiO2)

Jasper (Jasper (Silicate - SiO2)) — sedimentary

Jasper

Jasper (Silicate - SiO2)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Conglomeratic breccia (Clast-supported polymictic conglomerate/breccia, cemented by silica- or carbonate-rich matrix) — sedimentary

Conglomeratic breccia

Clast-supported polymictic conglomerate/breccia, cemented by silica- or carbonate-rich matrix

Bumblebee Jasper (Fibrous Calcite with Arsenic and Sulfur Inclusions) — gemstone

Bumblebee Jasper

Fibrous Calcite with Arsenic and Sulfur Inclusions

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)