Rock Identifier

Category

Mineral, Often A Rock Given Its Aggregate Nature

Browse mineral, often a rock given its aggregate nature specimens identified by the Rock Identifier community.

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
Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

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

Howlite

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

mineral
Basalt (Basalt (composition predominately plagioclase feldspar and pyroxene)) — igneous

Basalt

Basalt (composition predominately plagioclase feldspar and pyroxene)

igneous
Tufa (Vesicular Limestone) (Tufa (form of Calcium Carbonate, CaCO3)) — sedimentary

Tufa (Vesicular Limestone)

Tufa (form of Calcium Carbonate, CaCO3)

sedimentary
Chert (Septarian or Nodular variety) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Septarian or Nodular variety)

Microcrystalline Quartz (SiO2)

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

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

mineral
Howlite (Tumbled) (Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)) — mineral

Howlite (Tumbled)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

mineral
Basalt (Extrusive mafic igneous rock) — igneous

Basalt

Extrusive mafic igneous rock

igneous
Basalt with Vesicular Surface (Basalt (Mafic Extrusive)) — igneous

Basalt with Vesicular Surface

Basalt (Mafic Extrusive)

igneous
Quartz (Pebble) (Quartz (SiO₂)) — Mineral

Quartz (Pebble)

Quartz (SiO₂)

Mineral
Greywacke (River Slikenside) (Greywacke (Lithic Sandstone)) — sedimentary

Greywacke (River Slikenside)

Greywacke (Lithic Sandstone)

sedimentary
Tufa (Calcareous Tufa (CaCO3)) — sedimentary

Tufa

Calcareous Tufa (CaCO3)

sedimentary
Conglomerate (Conglomerate (Detrital Sedimentary Rock)) — sedimentary

Conglomerate

Conglomerate (Detrital Sedimentary Rock)

sedimentary
Quartz (possibly milky quartz) (Quartz (Silica; SiO₂)) — Mineral

Quartz (possibly milky quartz)

Quartz (Silica; SiO₂)

Mineral
Red Sandstone Pebble (Arenite (primarily Quartz SiO2 with Hematite Fe2O3 staining)) — sedimentary

Red Sandstone Pebble

Arenite (primarily Quartz SiO2 with Hematite Fe2O3 staining)

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

Quartz Pebble

Quartz (Silicon Dioxide - SiO2)

mineral
Quartzite Pebble (Metamorphosed Quartz Sandstone (SiO2)) — metamorphic

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

metamorphic
Granite (Phaneritic Igneous Rock (Granite)) — igneous

Granite

Phaneritic Igneous Rock (Granite)

igneous
Conglomerate (Conglomerate (clastic sedimentary rock)) — sedimentary

Conglomerate

Conglomerate (clastic sedimentary rock)

sedimentary
Quartzite Pebbler (Quartzite (SiO2)) — metamorphic

Quartzite Pebbler

Quartzite (SiO2)

metamorphic
Quartz (Iron-stained) (Silicon Dioxide (SiO2)) — mineral

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

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

Quartz / Vein Quartz

Quartz (Silicon Dioxide, SiO2)

mineral
Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

metamorphic
Granite (Granite (silica-rich intrusive igneous rock)) — igneous

Granite

Granite (silica-rich intrusive igneous rock)

igneous
Granite (Granite (Felsic Plutonic Rock)) — igneous

Granite

Granite (Felsic Plutonic Rock)

igneous
Basalt (Basalt (Mafic Extrusive)) — igneous

Basalt

Basalt (Mafic Extrusive)

igneous
Travertine (Tufa) (Terrestrial Sedimentary Limestone (CaCO3)) — sedimentary

Travertine (Tufa)

Terrestrial Sedimentary Limestone (CaCO3)

sedimentary
Limestone (specifically Travertine or Tufa) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (specifically Travertine or Tufa)

Calcium Carbonate (CaCO3)

sedimentary
Basalt (Extrusive mafic igneous rock) — igneous

Basalt

Extrusive mafic igneous rock

igneous
Granite (specifically Rapakivi Granite) (Phaneritic Felsic Igneous Rock (Granite)) — igneous

Granite (specifically Rapakivi Granite)

Phaneritic Felsic Igneous Rock (Granite)

igneous
Coquina (Bioclastic Limestone) — sedimentary

Coquina

Bioclastic Limestone

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

Yellow Agate

Silicon Dioxide (SiO2) - variety of Chalcedony

mineral
River Cobble (Phyllite or Quartzite) (Metasedimentary Rock (often containing SiO2 or KAl2(AlSi3O10)(OH)2)) — metamorphic

River Cobble (Phyllite or Quartzite)

Metasedimentary Rock (often containing SiO2 or KAl2(AlSi3O10)(OH)2)

metamorphic
Basalt (Extrusive mafic igneous rock) — igneous

Basalt

Extrusive mafic igneous rock

igneous
Gold Nugget (Native Gold (Au)) — mineral

Gold Nugget

Native Gold (Au)

mineral
White Jade / White Chalcedony (Nephrite Jade (Ca2(Mg,Fe)5Si8O22(OH)2) or Chalcedony (SiO2)) — Mineral

White Jade / White Chalcedony

Nephrite Jade (Ca2(Mg,Fe)5Si8O22(OH)2) or Chalcedony (SiO2)

Mineral
Porphyritic Andesite (Andesite (Intermediate Extrusive Volcanic Rock)) — igneous

Porphyritic Andesite

Andesite (Intermediate Extrusive Volcanic Rock)

igneous
Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

metamorphic
Basalt (Mafic Igneous Rock) — igneous

Basalt

Mafic Igneous Rock

igneous
Raw Diamond (Diamond (pure Carbon, C)) — mineral

Raw Diamond

Diamond (pure Carbon, C)

mineral
Quartz (Gravel fragment) (Quartz (Silicon Dioxide, SiO2)) — mineral

Quartz (Gravel fragment)

Quartz (Silicon Dioxide, SiO2)

mineral