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

Rose Quartz with Girasol Effect (Silicon Dioxide (SiO2)) — mineral

Rose Quartz with Girasol Effect

Silicon Dioxide (SiO2)

Sandstone and Quartzite Specimens (SiO2 with varying mineral/clastic inclusions) — sedimentary/metamorphic

Sandstone and Quartzite Specimens

SiO2 with varying mineral/clastic inclusions

sedimentary/metamorphic

Banded Agate (Carnelian type) (Agate (Cryptocrystalline Quartz, SiO2)) — mineral

Banded Agate (Carnelian type)

Agate (Cryptocrystalline Quartz, SiO2)

Limonite (Ironstone Concretion) (Limonite: FeO(OH)·nH2O) — sedimentary

Limonite (Ironstone Concretion)

Limonite: FeO(OH)·nH2O

Sandstone (Siltstone or Fine-grained) (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone (Siltstone or Fine-grained)

Clastic sedimentary rock (primarily SiO2)

Dyed Howlite (often sold as Turquenite) (Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)) — mineral

Dyed Howlite (often sold as Turquenite)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Sandstone Pebble (Arenite (SiO2 based)) — sedimentary

Sandstone Pebble

Arenite (SiO2 based)

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

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

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

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Granite (Granite (Phaneritic igneous rock)) — igneous

Granite

Granite (Phaneritic igneous rock)

Sandstone (Arenite (SiO2 principal)) — sedimentary

Sandstone

Arenite (SiO2 principal)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Quartz Pebble (likely Chalcedony or Quartzite) (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble (likely Chalcedony or Quartzite)

Silicon Dioxide (SiO2)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Amygdaloidal Basalt (Extrusive mafic igneous rock with amygdules) — igneous

Amygdaloidal Basalt

Extrusive mafic igneous rock with amygdules

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Jasper (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Green Fluorite (Calcium Fluoride (CaF2)) — mineral

Green Fluorite

Calcium Fluoride (CaF2)

Sandstone (Ferruginous) (Sandstone (Clastic sedimentary rock, predominantly SiO2 with Fe2O3 cement)) — sedimentary

Sandstone (Ferruginous)

Sandstone (Clastic sedimentary rock, predominantly SiO2 with Fe2O3 cement)

Ocean Jasper (SiO2 (Silicon Dioxide with impurities)) — mineral

Ocean Jasper

SiO2 (Silicon Dioxide with impurities)

Quartz Pebble (Water-Worn) (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble (Water-Worn)

Silicon Dioxide (SiO2)

Diamond (Emerald Cut) (Carbon (C)) — mineral

Diamond (Emerald Cut)

Carbon (C)

Diamond (as set in a gold ring) (Carbon (C)) — mineral

Diamond (as set in a gold ring)

Carbon (C)

Diamond (Native Carbon (C)) — mineral

Diamond

Native Carbon (C)

Diamond (Carbon (C)) — mineral

Diamond

Carbon (C)

Sandstone (Limonitic/Iron-stained) (Sandstone (containing Quartz, SiO2, and Limonite, FeO(OH)·nH2O)) — sedimentary

Sandstone (Limonitic/Iron-stained)

Sandstone (containing Quartz, SiO2, and Limonite, FeO(OH)·nH2O)

Flint / Chert with Cortex (Microcrystalline Quartz (SiO2)) — sedimentary

Flint / Chert with Cortex

Microcrystalline Quartz (SiO2)

Ocean Jasper (Spherulitic Chalcedony (SiO2)) — mineral

Ocean Jasper

Spherulitic Chalcedony (SiO2)

Mica-rich metamorphic rock, likely schist (Biotite–muscovite schist, possibly garnet-bearing) — metamorphic

Mica-rich metamorphic rock, likely schist

Biotite–muscovite schist, possibly garnet-bearing

Banded Agate / Chalcedony (Cryptocrystalline Quartz (SiO2)) — mineral

Banded Agate / Chalcedony

Cryptocrystalline Quartz (SiO2)

Banded Agate (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — mineral

Banded Agate

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Amethyst Geode (Amethyst (Silicon Dioxide with Iron impurities, SiO2)) — mineral

Amethyst Geode

Amethyst (Silicon Dioxide with Iron impurities, SiO2)

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

Carnelian Agate

Silicon Dioxide (SiO2) with iron oxide inclusions

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Chalcedony Geode Part (Agate/Quartz) (Silicon Dioxide (SiO2)) — mineral

Chalcedony Geode Part (Agate/Quartz)

Silicon Dioxide (SiO2)

Labradorite ((Ca, Na)(Al, Si)4O8 (Calcium Sodium Aluminum Silicate)) — mineral

Labradorite

(Ca, Na)(Al, Si)4O8 (Calcium Sodium Aluminum Silicate)

Rose Quartz (Silicon dioxide (SiO2)) — mineral

Rose Quartz

Silicon dioxide (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Granite (Polished Pebble) (Phaneritic Plutonic Rock (primarily Orthoclase and Quartz)) — igneous

Granite (Polished Pebble)

Phaneritic Plutonic Rock (primarily Orthoclase and Quartz)

Quartz (specifically Citrine or Yellow Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (specifically Citrine or Yellow Quartz)

Silicon Dioxide (SiO2)

Leopard Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Leopard Jasper

Microcrystalline Quartz (SiO2)

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

Quartz (River Pebble)

Silicon Dioxide (SiO2)