Rock Identifier

Category

Gemstone

Browse gemstone specimens identified by the Rock Identifier community.

Learn about Gemstone in the encyclopedia

Achroite

Alexandrite

Almandine Garnet

Almandine Garnet

Amber

Andamooka Opal

Andesine

Andesine-Labradorite

Andesine-Labradorite

Andradite Garnet

Andradite Garnet

Ant Hill Garnet

Ant Hill Garnet

Aquamarine

Australian Opal

Australian Opal

Aventurine Feldspar

Aventurine Feldspar

Garnet (Rough Almandine Crystal) (Almandine Garnet (Fe3Al2(SiO4)3)) — mineral

Garnet (Rough Almandine Crystal)

Almandine Garnet (Fe3Al2(SiO4)3)

Orange Calcite (or Yellow Calcite) (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite (or Yellow Calcite)

Calcium Carbonate (CaCO3)

Yellow Quartz (Golden Quartz) (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz (Golden Quartz)

Silicon Dioxide (SiO2)

Sodalite (Na8(Al6Si6O24)Cl2) — mineral

Sodalite

Na8(Al6Si6O24)Cl2

Orthoclase Feldspar (KAlSi3O8 (Potassium Aluminum Silicate)) — mineral

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Amazonite (Microcline (KAlSi3O8) with trace lead (Pb)) — mineral

Amazonite

Microcline (KAlSi3O8) with trace lead (Pb)

Schorl (Black Tourmaline) in Quartz/Feldspar Matrix (NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)) — igneous

Schorl (Black Tourmaline) in Quartz/Feldspar Matrix

NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Sodalite (Sodalite (Na8(Al6Si6O24)Cl2)) — mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Moonstone (Tumbled) (Orthoclase (Potassium Feldspar) - (K,Na)AlSi3O8) — mineral

Moonstone (Tumbled)

Orthoclase (Potassium Feldspar) - (K,Na)AlSi3O8

Amazonite (Microcline (KAlSi3O8)) — mineral

Amazonite

Microcline (KAlSi3O8)

Prehnite (Ca2Al(AlSi3O10)(OH)2) — mineral

Prehnite

Ca2Al(AlSi3O10)(OH)2

Carnelian Agate (Silicon Dioxide (SiO2) - variety of Chalcedony) — mineral

Carnelian Agate

Silicon Dioxide (SiO2) - variety of Chalcedony

Quartz Pebble (with iron staining) (Quartz (Silicon Dioxide, SiO2)) — mineral

Quartz Pebble (with iron staining)

Quartz (Silicon Dioxide, SiO2)

Garnet (Garnet group [X3Y2(SiO4)3]) — mineral

Garnet

Garnet group [X3Y2(SiO4)3]

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

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Tiger's Eye (Silicon dioxide (SiO2) with fibrous inclusions of Crocidolite (Asbestos) replaced by Quartz) — metamorphic

Tiger's Eye

Silicon dioxide (SiO2) with fibrous inclusions of Crocidolite (Asbestos) replaced by Quartz

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Chert (and Chert Breccia) (Silicon Dioxide (SiO2)) — sedimentary

Chert (and Chert Breccia)

Silicon Dioxide (SiO2)

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

Agate (Chalcedony)

Silicon Dioxide (SiO2)

Chert (often called Flint) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (often called Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

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

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz Pebble with Matrix (Quartz (Silicon Dioxide, SiO2)) — mineral

Milky Quartz Pebble with Matrix

Quartz (Silicon Dioxide, SiO2)

Mookaite Jasper (Radiolarite (Silicified radiolarian chert)) — sedimentary

Mookaite Jasper

Radiolarite (Silicified radiolarian chert)

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

Carnelian Agate

Silicon Dioxide (SiO2) with iron oxide inclusions

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

Labradorite

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

Mookaite Jasper (Silicified Radiolarite (SiO2)) — sedimentary

Mookaite Jasper

Silicified Radiolarite (SiO2)

Citrine Quartz (Silicon Dioxide (SiO2)) — mineral

Citrine Quartz

Silicon Dioxide (SiO2)

Unakite Granite (Epidotized Granite) — metamorphic

Unakite Granite

Epidotized Granite

Banded Agate (specifically Carnelian Agate) (Silicon Dioxide (SiO2)) — mineral

Banded Agate (specifically Carnelian Agate)

Silicon Dioxide (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Tiger's Eye (Pseudomorph of Quartz after Crocidolite (SiO2)) — metamorphic

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Sodalite (Sodalite - Na8(Al6Si6O24)Cl2) — mineral

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

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

Chalcedony on Matrix (Botryoidal Agate)

Silicon Dioxide (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Jasper (likely Polychrome or Mookaite variants) (Silicon Dioxide (SiO2) with iron oxide and hydroxide inclusions) — sedimentary (chemically precipitated)

Jasper (likely Polychrome or Mookaite variants)

Silicon Dioxide (SiO2) with iron oxide and hydroxide inclusions

sedimentary (chemically precipitated)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Carnelian (Carnelian (Silicon Dioxide - SiO2)) — mineral

Carnelian

Carnelian (Silicon Dioxide - SiO2)

Chrysoprase (Nickel-bearing Chalcedony (SiO2 with Ni impurities)) — mineral

Chrysoprase

Nickel-bearing Chalcedony (SiO2 with Ni impurities)

Nuummite (Nuummite (Ortho-amphibole rock, primarily Anthophyllite and Gedrite)) — metamorphic

Nuummite

Nuummite (Ortho-amphibole rock, primarily Anthophyllite and Gedrite)

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities