Anthracite Coal
Anthracite (Carbon-rich Sedimentary-to-Metamorphic Rock)
metamorphic
Category
Igneous And Metamorphic
Browse igneous and metamorphic specimens identified by the Rock Identifier community.
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within a metamorphic matrix
metamorphic
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Schist
Mica Schist (primarily composed of quartz, feldspar, and mica)
metamorphic
Marble (polished)
Recrystallized Calcite (CaCO3)
metamorphic
Mica Schist
Muscovite/Biotite Schist
metamorphic
Granite (weathered/river-tumbled)
Granite (Plutonic Igneous Rock)
Igneous Rock
Jadeite and Nephrite (Jade)
Sodium Aluminum Silicate (Jadeite) / Calcium Magnesium Iron Silicate (Nephrite)
metamorphic
Jade
Jade can refer to two distinct minerals: Nephrite (a variety of the mineral actinolite, Ca2(Mg,Fe)5Si8O22(OH)2) and Jadeite (Na(Al,Fe3+)Si2O6). Based on the image, showing a relatively uniform green color and possibly slight translucence in bead form, it is very likely one of these, but determining which one from a photo is difficult without specific testing.
Mineral/Metamorphic Rock (Nephrite or Jadeite)
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Garnet Schist
Almandine Garnet-Mica Schist (X₃Y₂(SiO₄)₃)
metamorphic
White Marble
Metamorphosed Limestone (principally CaCO3)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18)
mineral
Beryl (Emerald Variety)
Beryllium aluminum silicate (Be3Al2(SiO3)6)
mineral
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Black Tourmaline
Schorl (Sodium Iron Aluminum Borosilicate Hydroxide), NaFe3Al6(BO3)3Si6O18(OH)4
mineral
Bornite (Peacock Ore)
Bornite (Cu5FeS4)
mineral
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Bornite (Peacock Ore)
Bornite (Cu5FeS4)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Jade (Jadeite or Nephrite)
Jadeite (NaAlSi2O6) or Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)
metamorphic
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Tiger's Eye (dark/grey variant)
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Peacock Ore (Bornite or Iridescent Chalcopyrite)
Bornite (Cu5FeS4) or Chalcopyrite (CuFeS2) with tarnish
mineral
Rhodonite
Rhodonite (Manganese Iron Magnesium Calcium Silicate - (Mn,Fe,Mg,Ca)SiO3)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Beryl (likely Emerald or Aquamarine in matrix)
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Schorl (Black Tourmaline) in Matrix
Sodium Iron Aluminum Borosilicate Hydroxide (NaFe2+3Al6Si6O18(BO3)3(OH)3OH)
mineral
Aventurine (Tan/Cream colored)
Quartz (SiO2) with mineral inclusions
mineral
Amazonite
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Beryl (var. Heliodor or Aquamarine)
Beryllium Aluminum Cyclosilicate (Be3Al2Si6O18)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Jadeite (Jade)
Jadeite (NaAlSi2O6)
metamorphic
Tiger's Eye
Silicon Dioxide (SiO2)
Mineral
Aquamarine
Beryl (Be3Al2Si6O18 with iron impurities)
mineral
Dragon Blood Jasper
Epidote with Red Piedmontite (Chalcedony/Quartz variant)
sedimentary
Orange Quartzite Pebble
Quartzite (SiO2)
metamorphic
Mica Schist
Mica Schist (primarily Muscovite and Biotite KAl2(AlSi3O10)(OH)2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral