Granite
Granodiorite / Granite (Phaneritic Igneous Rock)
igneous
Category
Mineralogical Specimen
Browse mineralogical specimen specimens identified by the Rock Identifier community.
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Chert (Green variety)
Silicon Dioxide (SiO2)
sedimentary
Calcite
Calcium Carbonate (CaCO3)
mineral
Dyed Agate
Silicon Dioxide (SiO2) - variety Chalcedony
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Muscovite Schist
Mica Schist (KAl2(AlSi3O10)(OH)2)
metamorphic
White Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Basalt Pebble
Mafic Igneous Rock (Basalt)
igneous
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Sandstone (Calcareous Sandstone)
Calcareous Sandstone (primarily SiO2 with CaCO3 cement)
sedimentary
Chert (River Pebble)
Microcrystalline silica (SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2 with various cementing agents)
sedimentary
Quartzite Pebble
Quartzite (mostly SiO2)
metamorphic
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Chert
Cryptocrystalline Silica (SiO2)
sedimentary
Quartz Pebble (Grit)
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Basalt River Stone
Basalt
igneous
Basalt (River Stone)
Extrusive mafic igneous rock
igneous
Quartz pebble
Silicon Dioxide (SiO2)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Yellow or Honey Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Yellow Quartzite (River Pebble)
Quartzite (primarily SiO2)
metamorphic
Chert (often called Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite pebble
Quartzite (SiO2)
metamorphic
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Granite Water-Worn Pebble
Intermediate to Felsic Phaneritic Igneous Rock
igneous
River Stone (Basalt)
Basalt
igneous
Chert (Iron-stained)
Chert (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Basalt with Quartz/Epidote Vein
Mafic volcanic rock (formula primarily (Mg, Fe)2SiO4 and CaAl2Si2O8)
igneous
Botryoidal Chalcedony (likely Chert or Agatized Coral)
Silicon Dioxide (SiO2)
mineral
Amethyst
Amethyst (SiO2 with iron impurities)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Riverstone Jasper (Chert variant)
Silicon Dioxide (SiO2)
sedimentary
Tiger Iron
Tiger Iron (Hematite, Red Jasper, and Chert/Tiger's Eye composite)
metamorphic
Sunstone
Oligoclase (Plagioclase Feldspar) with inclusions - (Ca, Na)((Al, Si)4O8)
mineral
Amazonite
Amazonite (KAlSi3O8); a green variety of Microcline feldspar
mineral
Petrified Wood
Silicified Wood (primarily Quartz / Chalcedony: SiO2)
metamorphic
Pyrite in Matrix (Fool's Gold)
Iron Disulfide (FeS2)
mineral