Amazonite
Amazonite (K(AlSi3O8))
mineral
Category
Mineral Health
Browse mineral health specimens identified by the Rock Identifier community.
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Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Mineral
Amethyst (Cabochon)
Silicon Dioxide (SiO2) with iron impurities
mineral
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Quartz Vein in Host Rock (likely Sandstone or Mudstone)
Silicon Dioxide (SiO2) within Sedimentary Matrix
sedimentary
Aventurine Quartz
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Gneissic Schist
Foliated Metamorphic Rock (Schist/Gneiss transition)
metamorphic
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Yellow Quartz or Citrine
Silicon Dioxide (SiO2)
mineral
Bornite
Bornite (Cu5FeS4)
mineral
Aventurine
Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Ferruginous Sandstone (River Pebble)
Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 cement)
sedimentary
Sandstone (Micaceous)
Clastic Sedimentary Rock (primarily SiO2 with Mica)
sedimentary
Granite (Weathered River Rock)
Granite (Phaneritic Igneous Rock)
igneous
Granite cobble
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Granite
Granite (High-silica plutonic rock)
Igneous
Diamond
Diamond (C)
mineral
Quartz Vein in Pelite (Metamorphic Rock)
Hydrothermal Quartz Veining in Metasedimentary Rock (SiO2)
metamorphic
Basalt with Plagioclase Phenocrysts (Porphyritic Basalt)
Porphyritic Basalt (Mafic volcanic rock)
igneous
Granite
Plutonic felsic igneous rock
igneous
Diamond (in a metal ring setting)
Diamond (Pure Carbon, C)
mineral
Quartzite pebble
Quartzite (composed primarily of Quartz, SiO2)
metamorphic
Basalt with Amygdaloidal Infilling
Porphyritic or Amygdaloidal Basalt
igneous
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Bornite
Copper Iron Sulfide (Cu5FeS4)
mineral
Chalcopyrite (Peacock Ore)
Chalcopyrite (CuFeS2)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock with secondary mineral fillings)
igneous
Sandstone (likely Graywacke or Siltstone variety)
Clastic Sedimentary Rock (SiO2 with assorted mineral fragments)
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Schist (Micaceous Schist)
Mica Schist
metamorphic
Granite
Granite (a felsic intrusive igneous rock)
igneous
Pumice
Pumice (volcanic rock)
Igneous
Rough Emerald (Beryl)
Emerald (Be3Al2(SiO3)6 with Cr/V impurities)
mineral
Quartz Geode or Druzy Quartz in Host Rock
Silicon Dioxide (SiO2)
mineral
Limonite (Iron Ore)
Limonite (Hydrated Iron Oxide, FeO(OH)·nH2O)
Mineral
Shale
Shale (Argillaceous sedimentary rock)
sedimentary
Sandstone (Quartz-rich)
Arenite (Quartz Arenite)
sedimentary
Gneiss (specifically Micaceous Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Amphibolite (specifically Hornblende Schist/Gneiss)
Amphibole-rich Metamorphic Rock
metamorphic