Black Diamond / Black Sapphire
Carbon (C) or Corundum (Al2O3)
mineral
Category
Metamorphic Mineral
Browse metamorphic mineral specimens identified by the Rock Identifier community.
Learn about Metamorphic Mineral in the encyclopedia
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Calcite
Calcium Carbonate (CaCO3)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz (Gravel Pebble)
Silicon Dioxide (SiO2)
mineral
Aventurine (Green)
Aventurine Quartz (SiO2 + Fuchsite inclusions)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Tanzanite
Blue Zoisite (Ca2Al3(SiO4)(Si2O7)O(OH))
mineral
Citrine
Silicon Dioxide (SiO2) with iron impurities
mineral
Pyrite (Fool's Gold) in Matrix
Iron Sulfide (FeS2)
mineral
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
White Quartz
Silicon Dioxide (SiO2)
mineral
Blue Sapphire
Corundum (Al2O3)
mineral
Quartz (specifically Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
White Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Mica Schist
Schist (Biotite/Muscovite dominant)
metamorphic
Limonite (Iron Ore)
Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)
mineral
Gneissic Schist
Foliated Metamorphic Rock (Schist/Gneiss transition)
metamorphic
Granitic Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Schist
Mica Schist
metamorphic
Tourmaline (likely Schorl)
Tourmaline Group Mineral (e.g., Schorl for black varieties); (Na,Ca)(Li,Mg,Fe,Mn,Al)3Al6(BO3)3Si6O18(OH)4
Mineral
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Rough Ruby
Corundum (Al2O3) with Chromium traces
mineral
Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Rhodonite in Quartz Matrix
Rhodonite (Manganese Iron Magnesium Calcium Silicate - Mn,Fe,Mg,Ca)SiO3
mineral
Quartz with Iron Oxide Inclusions
Silicon Dioxide (SiO2) with Hematite/Limonite
mineral
Auriferous Quartz with Pyrite
Gold-bearing Quartz (SiO2 + FeS2 + Au)
mineral
Quartz Vein in Siltstone
Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix
metamorphic
Blue Quartzite
Quartzite (primarily SiO2 with inclusions like Dumortierite or Magnesio-riebeckite)
metamorphic
Yellow Beryl (Heliodor)
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Emerald
Beryl (Be₃Al₂Si₆O₁₈), specifically the green variety colored by trace amounts of chromium or vanadium.
Mineral
Garnetiferous Quartzite (Garnet Gneiss Pebble)
Garnet-bearing Quartzite or Quartz-Feldspar Gneiss
metamorphic
Slate with Quartz
Low-grade Metamorphic Slate with SiO2 inclusions
metamorphic
Quartz (beads)
SiO2 (Silicon Dioxide)
Mineral
Stiped Slate Beach Pebble
Low-grade Metamorphic Slate with Quartz Vein (SiO2 on Phyllosilicate base)
metamorphic
Green Aventurine
Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Blue Quartzite
Quartzite with Dumortierite or Magnesio-riebeckite inclusions (SiO2)
metamorphic
Quartz (Milky Quartz with Iron Staining)
Silicon Dioxide (SiO2)
mineral