Rock Identifier

Category

Mineralogical Specimen

Browse mineralogical specimen specimens identified by the Rock Identifier community.

Fossiliferous Limestone with Rugose Coral (Calcium Carbonate (CaCO3) featuring Rugosa (extinct order of solitary and colony corals)) — sedimentary

Fossiliferous Limestone with Rugose Coral

Calcium Carbonate (CaCO3) featuring Rugosa (extinct order of solitary and colony corals)

White Quartz (Carved or Tumbled) (Silicon Dioxide (SiO2)) — mineral

White Quartz (Carved or Tumbled)

Silicon Dioxide (SiO2)

Yellow Quartz (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz

Silicon Dioxide (SiO2)

Chert (Field Stone/Pebble) (Microcrystalline or cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Field Stone/Pebble)

Microcrystalline or cryptocrystalline Quartz (SiO2)

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

Agate Geode

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Limestone (Grey and White specimens) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (Grey and White specimens)

Calcium Carbonate (CaCO3)

Pink Granite (Granite (Phaneritic Igneous Rock, primarily SiO2)) — igneous

Pink Granite

Granite (Phaneritic Igneous Rock, primarily SiO2)

Granite (Pink/Red Granite) (Phaneritic Felsic Igneous Rock) — igneous

Granite (Pink/Red Granite)

Phaneritic Felsic Igneous Rock

Chert / Fossiliferous Limestone (Sedimentary Chert (often containing CaCO3 or SiO2 replacements)) — sedimentary

Chert / Fossiliferous Limestone

Sedimentary Chert (often containing CaCO3 or SiO2 replacements)

Granite Pebble (Intrusive Magmatic Granite (Quartz, Feldspar, Mica)) — igneous

Granite Pebble

Intrusive Magmatic Granite (Quartz, Feldspar, Mica)

Milky Quartz or Moonstone (Silicon Dioxide (SiO2) or Potassium Aluminum Silicate (KAlSi3O8)) — mineral

Milky Quartz or Moonstone

Silicon Dioxide (SiO2) or Potassium Aluminum Silicate (KAlSi3O8)

Riverstone Jasper (Chert variant) (Silicon Dioxide (SiO2) with impurities) — sedimentary

Riverstone Jasper (Chert variant)

Silicon Dioxide (SiO2) with impurities

Chert / Jasper (Silicon Dioxide (SiO2)) — sedimentary

Chert / Jasper

Silicon Dioxide (SiO2)

Granite or Porphyritic Igneous Rock (weathered) (Granitoid) — Igneous

Granite or Porphyritic Igneous Rock (weathered)

Granitoid

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

Milky Quartz Pebble with Chert

Silicon Dioxide (SiO2)

Banded Calcite (Mexican Onyx) (Calcium Carbonate (CaCO3)) — mineral

Banded Calcite (Mexican Onyx)

Calcium Carbonate (CaCO3)

Banded River Cobble with Mafic Dike (Hydrothermally altered Graywacke or Sandstone with Mafic Intrusion) — igneous and sedimentary

Banded River Cobble with Mafic Dike

Hydrothermally altered Graywacke or Sandstone with Mafic Intrusion

igneous and sedimentary

Potassium Feldspar (Orthoclase) (KAlSi3O8) — mineral

Potassium Feldspar (Orthoclase)

KAlSi3O8

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

River Quartz Cobble

Silicon Dioxide (SiO2)

Banded Agate (Cryptocrystalline Quartz (SiO2)) — mineral

Banded Agate

Cryptocrystalline Quartz (SiO2)

Chert (Chalcedony/Agate variety) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Chalcedony/Agate variety)

Silicon Dioxide (SiO2)

Chalcedony (River Stone) (Microcrystalline Quartz (SiO2)) — mineral

Chalcedony (River Stone)

Microcrystalline Quartz (SiO2)

Kyawthuite (Kyawthuite (Bi3+Sb5+O4)) — mineral

Kyawthuite

Kyawthuite (Bi3+Sb5+O4)

Granite Pebble (Granite; primarily composed of Quartz (SiO2), Feldspar (KAlSi3O8), and Mica) — igneous

Granite Pebble

Granite; primarily composed of Quartz (SiO2), Feldspar (KAlSi3O8), and Mica

Basalt with Secondary Mineralization (Likely Zeolites or Calcite) (Aphanitic mafic volcanic rock with secondary mineral inclusions (e.g., CaAl2Si3O10·3H2O for Scolecite)) — igneous

Basalt with Secondary Mineralization (Likely Zeolites or Calcite)

Aphanitic mafic volcanic rock with secondary mineral inclusions (e.g., CaAl2Si3O10·3H2O for Scolecite)

Quartz Vein in Sedimentary Matrix (Silicon Dioxide (SiO2) with host rock) — mineral

Quartz Vein in Sedimentary Matrix

Silicon Dioxide (SiO2) with host rock

Quartzite Pebble (Metamorphic Quartzite (predominantly SiO2)) — metamorphic

Quartzite Pebble

Metamorphic Quartzite (predominantly SiO2)

Chert (Jasper variation) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper variation)

Microcrystalline Quartz (SiO2)

Amethyst Quartz Crust (Crystalline Silicon Dioxide with Iron impurities (SiO2)) — mineral

Amethyst Quartz Crust

Crystalline Silicon Dioxide with Iron impurities (SiO2)

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

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Granite (Granite) — igneous

Granite

Granite

Greenish rock with white veins, possibly epidote or chlorite bearing rock with quartz/calcite veins (Altered mafic rock or Epidosite) — metamorphic or igneous alteration

Greenish rock with white veins, possibly epidote or chlorite bearing rock with quartz/calcite veins

Altered mafic rock or Epidosite

metamorphic or igneous alteration

Quartzite pebble (Quartzite (SiO2 based)) — metamorphic

Quartzite pebble

Quartzite (SiO2 based)

Calamites (Fossil Plant) (Calamites (Genus), belonging to the class Equisetopsida) — sedimentary

Calamites (Fossil Plant)

Calamites (Genus), belonging to the class Equisetopsida

Chert (Jasper/Flint variety) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert (Chert (Microcrystalline Quartz, SiO2)) — sedimentary

Chert

Chert (Microcrystalline Quartz, SiO2)

Quartzite Pebble (Quartzite (SiO2)) — metamorphic

Quartzite Pebble

Quartzite (SiO2)

Quartz with Mica/Host Rock (Silicon Dioxide (SiO2) with Phyllosilicates) — mineral

Quartz with Mica/Host Rock

Silicon Dioxide (SiO2) with Phyllosilicates

Chert (specifically Flint or Jasper variant) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (specifically Flint or Jasper variant)

Microcrystalline quartz (SiO2)

Quartz (Citrine or Iron-stained Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)