Rock Identifier

Category

Mineral Specimen

Browse mineral specimen specimens identified by the Rock Identifier community.

Learn about Mineral Specimen in the encyclopedia

Emerald in Matrix

Emerald in Matrix

Aquamarine Matrix

Aquamarine Matrix

Morganite Crystal

Morganite Crystal

Emerald Crystal

Emerald Crystal

Aquamarine Crystal

Aquamarine Crystal

Mushroom Tourmaline

Mushroom Tourmaline

Glauconite

Hutcheonite

Halite

Sperrylite

Baddeleyite

Anatase

Blue Obsidian (Cullet Glass) (Silicon Dioxide (Amorphous Glass)) — mineral

Blue Obsidian (Cullet Glass)

Silicon Dioxide (Amorphous Glass)

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

Botryoidal Chalcedony (Agate)

Silicon Dioxide (SiO2)

Pitted Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Pitted Limestone

Calcium Carbonate (CaCO3)

Quartz (Milky/Chalcedony variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Chalcedony variety)

Silicon Dioxide (SiO2)

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

Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Pebble with Basaltic and Quartz-rich Banding (Polymictic Lithic Pebble) — sedimentary

Pebble with Basaltic and Quartz-rich Banding

Polymictic Lithic Pebble

Unidentifiable Specimen (Undetermined) — Unknown

Unidentifiable Specimen

Undetermined

Quartz Pebble (Silicon Dioxide (SiO2)) — Mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Basalt with Jasper Vein (Extrusive Igneous Rock with Quartz/Chalcedony Vein) — igneous

Basalt with Jasper Vein

Extrusive Igneous Rock with Quartz/Chalcedony Vein

Basalt with Quartz Vein (Mafic volcanic rock with hydrothermal SiO2 filling) — igneous

Basalt with Quartz Vein

Mafic volcanic rock with hydrothermal SiO2 filling

Basalt (Vesicular or Porphyritic River Pebble) (Mafic Volcanic Rock (Aphanitic to Porphyritic Basalt)) — igneous

Basalt (Vesicular or Porphyritic River Pebble)

Mafic Volcanic Rock (Aphanitic to Porphyritic Basalt)

Quartz with Celadonite Inclusion (Silicon Dioxide (SiO2) with green clay mineral inclusions) — mineral

Quartz with Celadonite Inclusion

Silicon Dioxide (SiO2) with green clay mineral inclusions

Cubic Zirconia (in Jewelry) (Zirconium Dioxide (ZrO2)) — mineral

Cubic Zirconia (in Jewelry)

Zirconium Dioxide (ZrO2)

Quartz pebble (Silicon dioxide (SiO2)) — mineral

Quartz pebble

Silicon dioxide (SiO2)

Orbicular jasper / brecciated jasper slab (Silicified volcanic rock composed mainly of microcrystalline quartz (SiO₂), with iron-oxide and possible chalcedony/agate bands) — metamorphic

Orbicular jasper / brecciated jasper slab

Silicified volcanic rock composed mainly of microcrystalline quartz (SiO₂), with iron-oxide and possible chalcedony/agate bands

Weathered granite or granitic gneiss cobble (Granite; primarily quartz, feldspar, and mica) — igneous

Weathered granite or granitic gneiss cobble

Granite; primarily quartz, feldspar, and mica

Granite cobble (Granite (composed primarily of Quartz, Feldspar, and Mica)) — igneous

Granite cobble

Granite (composed primarily of Quartz, Feldspar, and Mica)

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

Clear Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Quartz on Host Rock (Silicon Dioxide (SiO2)) — mineral

Quartz on Host Rock

Silicon Dioxide (SiO2)

Quartz (Smoky/Grey variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Smoky/Grey variety)

Silicon Dioxide (SiO2)

Fluorite with Quartz coating (Calcium Fluoride (CaF2) with Silicon Dioxide (SiO2)) — mineral

Fluorite with Quartz coating

Calcium Fluoride (CaF2) with Silicon Dioxide (SiO2)

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

Quartz Vein Rock

Silicon Dioxide (SiO2)

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

White Quartz Pebble

Silicon Dioxide (SiO2)

Granite (Granite; primarily quartz, alkali feldspar, plagioclase, and biotite/hornblende) — igneous

Granite

Granite; primarily quartz, alkali feldspar, plagioclase, and biotite/hornblende

Milky quartz-rich rock (Quartz (SiO₂), likely massive milky quartz with minor iron-stained gangue) — mineral

Milky quartz-rich rock

Quartz (SiO₂), likely massive milky quartz with minor iron-stained gangue

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Yellow Quartz (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz

Silicon Dioxide (SiO2)

Common Opal (Hydrated amorphous silica (SiO2·nH2O)) — mineral

Common Opal

Hydrated amorphous silica (SiO2·nH2O)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Amethyst (Silicon Dioxide (SiO2) containing iron impurities and irradiation) — mineral

Amethyst

Silicon Dioxide (SiO2) containing iron impurities and irradiation

Tiger's Eye (Silicon dioxide with fibrous inclusions (SiO2)) — mineral

Tiger's Eye

Silicon dioxide with fibrous inclusions (SiO2)

Bloodstone (Heliotrope) — Mineral

Bloodstone

Heliotrope

Citrine (Silicon Dioxide (SiO2)) — mineral

Citrine

Silicon Dioxide (SiO2)

Pyrite in Matrix (Quartz/Schist) (Iron Sulfide (FeS2)) — mineral

Pyrite in Matrix (Quartz/Schist)

Iron Sulfide (FeS2)

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

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Quartz Pebble (with Mica or Iron staining) (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble (with Mica or Iron staining)

Silicon Dioxide (SiO2)

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

Pink Quartz Pebble

Silicon Dioxide (SiO2)

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

Yellow Agate (Chalcedony)

Silicon Dioxide (SiO2)

Limonite (FeO(OH)•nH2O) — mineral

Limonite

FeO(OH)•nH2O

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

Quartz (Milky or Cloudy)

Silicon Dioxide (SiO2)

Sandstone (Arenite (SiO2 based)) — sedimentary

Sandstone

Arenite (SiO2 based)

Sandstone (likely Ferruginous) (Arenite (primarily SiO2 with Fe2O3 staining)) — sedimentary

Sandstone (likely Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)