Rock Identifier

Category

Mineralogical Specimen

Browse mineralogical specimen specimens identified by the Rock Identifier community.

Learn about Mineralogical Specimen in the encyclopedia

Emerald in Matrix

Emerald in Matrix

Morganite Crystal

Morganite Crystal

Aquamarine Matrix

Aquamarine Matrix

Emerald Crystal

Emerald Crystal

Aquamarine Crystal

Aquamarine Crystal

Mushroom Tourmaline

Mushroom Tourmaline

White Beryl

Smoky Quartz

Clear Obsidian

Goshenite Crystal

Goshenite Crystal

Magnetite

Crocoite

Chert Conglomerate (or Breccia) (Sedimentary Clastic Rock (variety: Ferruginous Chert Breccia)) — sedimentary

Chert Conglomerate (or Breccia)

Sedimentary Clastic Rock (variety: Ferruginous Chert Breccia)

Chert / Flint (Chert (SiO2)) — sedimentary

Chert / Flint

Chert (SiO2)

Porphyry (Porphyritic Basalt or Andesite) — igneous

Porphyry

Porphyritic Basalt or Andesite

Labradorite (Labradorite ((Ca, Na)(Al, Si)4O8)) — mineral

Labradorite

Labradorite ((Ca, Na)(Al, Si)4O8)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Diamond (in a jewelry setting) (Cubic Carbon (C)) — mineral

Diamond (in a jewelry setting)

Cubic Carbon (C)

Limestone (Limestone (Calcium Carbonate, CaCO3)) — sedimentary

Limestone

Limestone (Calcium Carbonate, CaCO3)

Sandstone (clastic) (Clastic Sedimentary Rock (primarily composed of SiO2)) — sedimentary

Sandstone (clastic)

Clastic Sedimentary Rock (primarily composed of SiO2)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Green Calcite (Calcium Carbonate (CaCO3)) — mineral

Green Calcite

Calcium Carbonate (CaCO3)

Quartz (Milky or Citrine-tinted) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky or Citrine-tinted)

Silicon Dioxide (SiO2)

Amethyst (Rough) (Amethyst (SiO2 with Iron impurities)) — mineral

Amethyst (Rough)

Amethyst (SiO2 with Iron impurities)

Jasper and Epidote (Unakite-like specimen) (Epidotized granite or Jasper with Epidote inclusions) — metamorphic

Jasper and Epidote (Unakite-like specimen)

Epidotized granite or Jasper with Epidote inclusions

Aquamarine (Beryl (Be3Al2Si6O18) with trace Iron (Fe2+)) — mineral

Aquamarine

Beryl (Be3Al2Si6O18) with trace Iron (Fe2+)

Bivalve Fossil (Internal Mold) (Class Bivalvia (Phylum Mollusca)) — sedimentary

Bivalve Fossil (Internal Mold)

Class Bivalvia (Phylum Mollusca)

Sunstone (Andesine-Labradorite Feldspar ((Ca,Na)(Al,Si)4O8)) — mineral

Sunstone

Andesine-Labradorite Feldspar ((Ca,Na)(Al,Si)4O8)

Amazonite (Amazonite (K(AlSi3O8))) — mineral

Amazonite

Amazonite (K(AlSi3O8))

Amazonite (K(AlSi3O8) - Microcline variant) — mineral

Amazonite

K(AlSi3O8) - Microcline variant

Fluorite on Matrix (Calcium Fluoride (CaF2)) — mineral

Fluorite on Matrix

Calcium Fluoride (CaF2)

Green Fluorite (Calcium Fluoride (CaF2)) — mineral

Green Fluorite

Calcium Fluoride (CaF2)

Granite (Granite (composed primarily of silica-rich minerals like quartz and feldspar)) — igneous

Granite

Granite (composed primarily of silica-rich minerals like quartz and feldspar)

Basalt Beach Pebble (Basalt (Mafic Volcanic Rock)) — igneous

Basalt Beach Pebble

Basalt (Mafic Volcanic Rock)

Agate Nodule (partially vuggy Quartz) (Silicon Dioxide (SiO2)) — Mineral/Sedimentary

Agate Nodule (partially vuggy Quartz)

Silicon Dioxide (SiO2)

Mineral/Sedimentary

Limonite (FeO(OH)·nH2O) — mineral

Limonite

FeO(OH)·nH2O

Greenish-gray quartz-rich rock, possibly weathered granite or quartzite (Provisional identification: quartz–feldspar aggregate; exact species cannot be confirmed from one photograph) — igneous

Greenish-gray quartz-rich rock, possibly weathered granite or quartzite

Provisional identification: quartz–feldspar aggregate; exact species cannot be confirmed from one photograph

Small purple quartz crystal, likely amethyst (Amethyst: violet variety of quartz, silicon dioxide (SiO₂)) — gemstone

Small purple quartz crystal, likely amethyst

Amethyst: violet variety of quartz, silicon dioxide (SiO₂)

Fossil bivalve shell (Likely an extinct or modern-like ribbed cockle/scallop; exact genus requires locality and diagnostic hinge features) — fossil

Fossil bivalve shell

Likely an extinct or modern-like ribbed cockle/scallop; exact genus requires locality and diagnostic hinge features

Sandstone River Pebble (Arenite (SiO2 predominantly)) — sedimentary

Sandstone River Pebble

Arenite (SiO2 predominantly)

Pink granite (Felsic intrusive igneous rock; mainly quartz, potassium feldspar, plagioclase, and minor mica) — igneous

Pink granite

Felsic intrusive igneous rock; mainly quartz, potassium feldspar, plagioclase, and minor mica

Amber / Copal (Succinite (fossilized tree resin)) — mineraloid

Amber / Copal

Succinite (fossilized tree resin)

Blue Lace Agate (Tumbled) (Silicon Dioxide (SiO2)) — mineral

Blue Lace Agate (Tumbled)

Silicon Dioxide (SiO2)

Quartz Crystal Cluster on Matrix (Silicon Dioxide (SiO2)) — mineral

Quartz Crystal Cluster on Matrix

Silicon Dioxide (SiO2)

Jasper (Jasper (Silicon Dioxide, SiO2)) — sedimentary

Jasper

Jasper (Silicon Dioxide, SiO2)

Chalcedony (Common Agate) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Common Agate)

Silicon Dioxide (SiO2)

Quartz (Milky or Cloudy Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky or Cloudy Quartz)

Silicon Dioxide (SiO2)

Carborundum (Silicon Carbide (SiC)) — mineral

Carborundum

Silicon Carbide (SiC)

Serpentinite (Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4) — metamorphic

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Opalite (Synthetic Moonstone/Opal) (Synthetic Silica Glass) — mineraloid (synthetic)

Opalite (Synthetic Moonstone/Opal)

Synthetic Silica Glass

mineraloid (synthetic)

Banded Agate (Onyx type) (Silicon Dioxide (SiO2) - Cryptocrystalline Quartz) — mineral

Banded Agate (Onyx type)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Chert (Yellow Jasper) (Silicon dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Chert (Yellow Jasper)

Silicon dioxide (SiO2) - Microcrystalline Quartz

Pearl (Biogenic Mineraloid) (Calcium carbonate (Aragonite) and Conchiolin, CaCO3) — mineral

Pearl (Biogenic Mineraloid)

Calcium carbonate (Aragonite) and Conchiolin, CaCO3

Quartz (Silicon Dioxide (SiO₂)) — Mineral

Quartz

Silicon Dioxide (SiO₂)