Sapphire Rough (Corundum)
Corundum (Aluminum Oxide, Al2O3)
mineral
Category
Metamorphic Or Igneous (Context Dependent)
Browse metamorphic or igneous (context dependent) specimens identified by the Rock Identifier community.
Learn about Metamorphic Or Igneous (Context Dependent) in the encyclopedia
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Peridotite (Olivine)
Peridotite (comprising (Mg,Fe)2SiO4)
igneous
Native Gold (in the form of jewelry)
Gold (Au)
mineral
Quartz Pebble with Epidote / Chlorite Inclusions
Silicon Dioxide (SiO2) with Epidote/Chlorite inclusions
mineral
Granite
Phaneritic plutonic rock (primarily Quartz, Alkali Feldspar, and Plagioclase)
igneous
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Likely basalt fragment
Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with possible olivine
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Hematite (Tumbled)
Iron(III) oxide (Fe2O3)
mineral
Sapphire
Corundum (Al2O3)
gemstone
Green Quartz (Prasiolite)
Silicon Dioxide (SiO2)
mineral
Ruby (set in a gold pendant)
Ruby (Variety of Corundum, Al2O3)
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Grey Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Auriferous Quartz (Gold-bearing Quartz)
Silicon Dioxide (SiO2) with trace Gold (Au) and Iron Oxides
mineral
Gold-Bearing Quartz Ore
Crystalline Silicon Dioxide (SiO2) with Trace Aurum (Au)
mineral
Magnetite
Magnetite (Fe3O4)
Mineral
Granite
Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Milk Quartz (White) and Yellow Aventurine (Yellow)
Silicon Dioxide (SiO2)
mineral
Porphyritic polymictic breccia (likely volcanic breccia)
Volcanic breccia; probable polymictic andesite–dacite breccia with quartz/feldspar clasts
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock pebble
sedimentary
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Granodiorite
Granodiorite
igneous
Yellow Sapphire
Corundum (Al2O3)
gemstone
Yellow Sapphire
Corundum (Al2O3)
gemstone
Ruby / Red Tourmaline
Corundum (Al2O3) or Elbaite (Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)4)
mineral
Star Ruby
Corundum (Al2O3 with chromium and rutile inclusions)
mineral
Granite
Granite (Phaneritic igneous rock)
igneous
Aquamarine (Beryl) Beads
Beryllium aluminum silicate (Be3Al2Si6O18)
gemstone
Sapphire
Corundum (Al2O3)
mineral
Green Aventurine
Quartz with Fuchsite inclusions (SiO2)
mineral
River Cobble (likely Serpentinite or Greenstone)
Serpentinite / Greenschist facies rock
metamorphic
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Mica Schist
Mica Schist (Quartz-Mica Schist)
metamorphic
Quartz in Matrix (or Quartz Vein Rock)
Silicon Dioxide (SiO2) with host rock
igneous
Granite
Granite (Phaneritic igneous rock composed of Quartz, Feldspar, and Mica)
igneous
Glass
Amorphous Silicon Dioxide (SiO2)
mineraloid
Porphyry (Flower Stone)
Porphyry (Andesite or Basalt matrix)
igneous
Granite
Phaneritic plutonic rock (composed of Quartz, Feldspar, and Mica/Amphibole)
igneous