Rock Identifier

Category

Mineral (Biogenic)

Browse mineral (biogenic) specimens identified by the Rock Identifier community.

Smoky Quartz and Feldspar Pegmatite (Granitic Pegmatite (chiefly SiO2 and KAlSi3O8)) — igneous

Smoky Quartz and Feldspar Pegmatite

Granitic Pegmatite (chiefly SiO2 and KAlSi3O8)

Basalt (Extrusive mafic igneous rock) — igneous

Basalt

Extrusive mafic igneous rock

Quartz Druzy on Agate (River Cobble) (Silicon Dioxide (SiO2)) — Mineral / Sedimentary (often associated with volcanic hosts)

Quartz Druzy on Agate (River Cobble)

Silicon Dioxide (SiO2)

Mineral / Sedimentary (often associated with volcanic hosts)

Yellow Chalcedony or River Jasper (Silicon Dioxide (SiO2)) — sedimentary

Yellow Chalcedony or River Jasper

Silicon Dioxide (SiO2)

Herkimer Diamond in Matrix (Quartz (SiO2) in Dolostone (CaMg(CO3)2)) — sedimentary (host) / mineral (crystals)

Herkimer Diamond in Matrix

Quartz (SiO2) in Dolostone (CaMg(CO3)2)

sedimentary (host) / mineral (crystals)

Labradorite (Larvikite variety) ((Na,Ca)(Al,Si)4O8 (Plagioclase Feldspar)) — igneous

Labradorite (Larvikite variety)

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

Tiger Iron (Tiger Iron (composite of Tiger's Eye, Red Jasper, and Hematite)) — metamorphic

Tiger Iron

Tiger Iron (composite of Tiger's Eye, Red Jasper, and Hematite)

Fuchsite on Quartzite (Muscovite (Chromium-bearing) K(Al,Cr)2(AlSi3O10)(OH)2) — metamorphic

Fuchsite on Quartzite

Muscovite (Chromium-bearing) K(Al,Cr)2(AlSi3O10)(OH)2

Fossil Rugose Coral (Horn Coral) (Order Rugosa (likely Grewingkia or Heliophyllum species); Calcium Carbonate (CaCO3)) — sedimentary

Fossil Rugose Coral (Horn Coral)

Order Rugosa (likely Grewingkia or Heliophyllum species); Calcium Carbonate (CaCO3)

Fuchsite on Quartz (Muscovite (KAl2(AlSi3O10)(OH)2) with Chromium impurities) — metamorphic

Fuchsite on Quartz

Muscovite (KAl2(AlSi3O10)(OH)2) with Chromium impurities

Sandstone with Tafoni Weathering (Arenite (SiO2 based)) — sedimentary

Sandstone with Tafoni Weathering

Arenite (SiO2 based)

Fluorite and Rose Quartz (Fluorite (CaF2), Rose Quartz (SiO2)) — Mineral

Fluorite and Rose Quartz

Fluorite (CaF2), Rose Quartz (SiO2)

Quartz with Mica inclusion (Silicon Dioxide (SiO2) with Muscovite/Biotite inclusions) — igneous

Quartz with Mica inclusion

Silicon Dioxide (SiO2) with Muscovite/Biotite inclusions

Howlite (Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)) — mineral

Howlite

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

Mica Schist (Foliated Metamorphic Rock (rich in Muscovite or Biotite)) — metamorphic

Mica Schist

Foliated Metamorphic Rock (rich in Muscovite or Biotite)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Granite (Plutonic felsic rock (Quartz, Feldspar, Mica)) — igneous

Granite

Plutonic felsic rock (Quartz, Feldspar, Mica)

Soapstone (Steatite (composed primarily of Talc, Mg3Si4O10(OH)2)) — metamorphic

Soapstone

Steatite (composed primarily of Talc, Mg3Si4O10(OH)2)

Green Aventurine (Quartzite) (Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)) — metamorphic

Green Aventurine (Quartzite)

Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)

Granite (Granite (Felsic intrusive igneous rock)) — igneous

Granite

Granite (Felsic intrusive igneous rock)

Basalt (Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)) — igneous

Basalt

Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)

Mica Schist (Mica Schist (Schistose metamorphic rock rich in Muscovite/Biotite)) — metamorphic

Mica Schist

Mica Schist (Schistose metamorphic rock rich in Muscovite/Biotite)

Magnetite / Iron Ore (Magnetite (Fe3O4)) — mineral

Magnetite / Iron Ore

Magnetite (Fe3O4)

Gneiss (Gneiss (High-grade Regional Metamorphic Rock)) — metamorphic

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Black Star Diopside (Diopside (CaMgSi2O6) with Magnetite inclusions) — mineral

Black Star Diopside

Diopside (CaMgSi2O6) with Magnetite inclusions

Rough Diamond (Diamond (pure Carbon, C)) — mineral

Rough Diamond

Diamond (pure Carbon, C)

Druzy Quartz Geode (Vug) (Silicon Dioxide (SiO2)) — mineral

Druzy Quartz Geode (Vug)

Silicon Dioxide (SiO2)

Amber (Succinite (Resin C10H16O)) — mineral

Amber

Succinite (Resin C10H16O)

Quartz Pebble (Water-worn Quartzite) (Silicon Dioxide (SiO2)) — metamorphic

Quartz Pebble (Water-worn Quartzite)

Silicon Dioxide (SiO2)

Quartz (Iron-Stained) (Silicon Dioxide (SiO2)) — mineral

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

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

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Limonite (Iron Ore) (Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)) — mineral

Limonite (Iron Ore)

Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

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

Quartz (Common or Milky)

Silicon Dioxide (SiO2)

Yellow Jasper with Dendritic Inclusions (Silicon Dioxide (SiO2) with Manganese/Iron Oxide inclusions) — sedimentary

Yellow Jasper with Dendritic Inclusions

Silicon Dioxide (SiO2) with Manganese/Iron Oxide inclusions

Bauxite (Bauxite (mixture of Hydrous Aluminum Oxides)) — sedimentary

Bauxite

Bauxite (mixture of Hydrous Aluminum Oxides)

Barite (Desert Rose or Cockscomb variety) (Barium Sulfate (BaSO4)) — mineral

Barite (Desert Rose or Cockscomb variety)

Barium Sulfate (BaSO4)

Obsidian (Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)) — Igneous

Obsidian

Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Limonite (Ironstone Concretion) (Limonite (Hydrous ferric oxide mixture, FeO(OH)·nH2O)) — sedimentary

Limonite (Ironstone Concretion)

Limonite (Hydrous ferric oxide mixture, FeO(OH)·nH2O)