Rock Identifier

Category

Mineralogical Specimen

Browse mineralogical specimen specimens identified by the Rock Identifier community.

Basalt (Gravel Pebble) (Basalt (contains pyroxene, plagioclase feldspar, and olivine)) — igneous

Basalt (Gravel Pebble)

Basalt (contains pyroxene, plagioclase feldspar, and olivine)

igneous
Quartzite with Quartz Geode / Vug (Crystalline Silicon Dioxide (SiO2) in Metamorphic Host) — metamorphic

Quartzite with Quartz Geode / Vug

Crystalline Silicon Dioxide (SiO2) in Metamorphic Host

metamorphic
Quartzite (Quartzite (high SiO2 content)) — metamorphic

Quartzite

Quartzite (high SiO2 content)

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

Sunstone

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

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

Bivalve Fossil (Internal Mold)

Class Bivalvia (Phylum Mollusca)

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

Amazonite

Amazonite (K(AlSi3O8))

mineral
Yellow Quartzite (River Pebble) (Quartzite (mainly SiO2)) — metamorphic

Yellow Quartzite (River Pebble)

Quartzite (mainly SiO2)

metamorphic
Agate (SiO2) — Mineral

Agate

SiO2

Mineral
Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

sedimentary
Chert (including varieties like Flint) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (including varieties like Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

sedimentary
Fluorite (Durango Fluorite) (Calcium Fluoride (CaF2)) — mineral

Fluorite (Durango Fluorite)

Calcium Fluoride (CaF2)

mineral
Calcite (or Alabaster, if truly carved) (Calcium Carbonate (CaCO3)) — Mineral/Rock

Calcite (or Alabaster, if truly carved)

Calcium Carbonate (CaCO3)

Mineral/Rock
Basalt (River Pebble) (Basalt (dominated by Plagioclase Feldspar and Pyroxene)) — igneous

Basalt (River Pebble)

Basalt (dominated by Plagioclase Feldspar and Pyroxene)

igneous
Basalt River Stone (Basalt (Mafic volcanic rock)) — igneous

Basalt River Stone

Basalt (Mafic volcanic rock)

igneous
Diamond (Diamond (pure carbon, C)) — mineral

Diamond

Diamond (pure carbon, C)

mineral
Chert (variations include Flint or Jasper) (Chert (Silicon Dioxide, SiO2)) — sedimentary

Chert (variations include Flint or Jasper)

Chert (Silicon Dioxide, SiO2)

sedimentary
Chert (Chert Nodule) (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Chert (Chert Nodule)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

sedimentary
Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

mineral
Porphyry (Porphyritic Basalt or Andesite) — igneous

Porphyry

Porphyritic Basalt or Andesite

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

Limestone

Limestone (Calcium Carbonate, CaCO3)

sedimentary
Sandstone Pebble (Arenite (SiO2 with various cementing agents)) — sedimentary

Sandstone Pebble

Arenite (SiO2 with various cementing agents)

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

Milky Quartz

Silicon Dioxide (SiO2)

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

Quartz Pebble

Silicon Dioxide (SiO2)

mineral
Concrete Rubble with Aggregate (Hardened Portland Cement Paste with Coarse Aggregate) — Anthropogenic (Man-made)

Concrete Rubble with Aggregate

Hardened Portland Cement Paste with Coarse Aggregate

Anthropogenic (Man-made)
Chert Conglomerate (or Breccia) (Sedimentary Clastic Rock (variety: Ferruginous Chert Breccia)) — sedimentary

Chert Conglomerate (or Breccia)

Sedimentary Clastic Rock (variety: Ferruginous Chert Breccia)

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

Labradorite

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

mineral
Chert / Flint (Chert (SiO2)) — sedimentary

Chert / Flint

Chert (SiO2)

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

Diamond (in a jewelry setting)

Cubic Carbon (C)

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

Sandstone (clastic)

Clastic Sedimentary Rock (primarily composed of SiO2)

sedimentary
Petrified Wood (Silicified Wood (SiO2)) — mineral

Petrified Wood

Silicified Wood (SiO2)

mineral
Boulder Opal (Amorphous Hydrous Silica (SiO2·nH2O)) — mineral

Boulder Opal

Amorphous Hydrous Silica (SiO2·nH2O)

mineral
Pyrite (Iron Pyrite) with Goethite Oxidation (Iron Sulfide (FeS2)) — mineral

Pyrite (Iron Pyrite) with Goethite Oxidation

Iron Sulfide (FeS2)

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

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

mineral
Beryl (likely Aquamarine or Green Beryl) (Beryllium aluminum silicate (Be3Al2Si6O18)) — mineral

Beryl (likely Aquamarine or Green Beryl)

Beryllium aluminum silicate (Be3Al2Si6O18)

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

Citrine Quartz

Silicon Dioxide (SiO2)

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

Amazonite

K(AlSi3O8) - Microcline variant

mineral
Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Chert

Microcrystalline Quartz (SiO2)

sedimentary
Chert (Arrowhead or Flake) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (Arrowhead or Flake)

Microcrystalline quartz (SiO2)

sedimentary
Fossilized Coral (Petrified Coral) (Anthozoa (Scleractinia)) — sedimentary

Fossilized Coral (Petrified Coral)

Anthozoa (Scleractinia)

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

Quartz Pebble

Silicon Dioxide (SiO2)

mineral
Porphyritic Basalt (with Weathered Jointing) (Porphyritic Basalt) — igneous

Porphyritic Basalt (with Weathered Jointing)

Porphyritic Basalt

igneous
Coal (Bituminous) (Sedimentary carbonaceous rock) — sedimentary

Coal (Bituminous)

Sedimentary carbonaceous rock

sedimentary