Orange Calcite
Calcite (CaCO3)
Mineral
Category
Metamorphic (Low Grade)
Browse metamorphic (low grade) specimens identified by the Rock Identifier community.
Garnet (Almandine/Pyrope series)
Silicate mineral (Almandine: Fe3Al2Si3O12; Pyrope: Mg3Al2Si3O12)
mineral
Schorl (Black Tourmaline)
NaFe3Al6(BO3)3Si6O18(OH)4 (Sodium Iron Aluminum Borosilicate)
mineral
Jade (Nephrite or Jadeite)
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2 - a variety of actinolite, an amphibole mineral); Jadeite (Na(Al,Fe3+)Si2O6 - a pyroxene mineral)
Metamorphic rock (for both Nephrite and Jadeite)
Blue Apatite
Apatite (Ca5(PO4)3(F,Cl,OH))
mineral
Limonite (also known as Yellow Ochre or Brown Hematite)
Limonite (Hydrated iron oxide-hydroxide, FeO(OH)·nH2O)
Mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Rhodonite
Manganese Silicate (Mn, Fe, Mg, Ca)SiO3
mineral
Tiger's Eye
Silicon dioxide (SiO2) with fibrous inclusions of crocidolite
Mineral
Schist (Micaceous Schist)
Schist (containing mainly Muscovite and Quartz)
metamorphic
Banded Gneiss
Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica)
metamorphic
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss (River Cobble)
Gneiss (Foliated Metamorphic Rock)
metamorphic
Gneiss
Gneiss
metamorphic
Schist
Mica Schist (variety: Muscovite/Biotite Schist)
metamorphic
Gneiss (Granitic Gneiss)
Gneiss (from German Gneis, related to 'spark')
metamorphic
Petrified Wood
Silicified Wood (primarily SiO₂ - Silicon Dioxide)
metamorphic
Gneiss (with Quartz-Feldspar vein)
Gneiss (high-grade metamorphic rock) containing Quartz (SiO2) and Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8)
metamorphic
Bloodstone (Heliotrope)
Silicon Dioxide (SiO2) - Variety of Chalcedony/Jasper
mineral
Diamond
Native Carbon (C)
mineral
Raw Diamond
Diamond (pure Carbon, C)
mineral
Rough Emerald
Beryl (Be3Al2(SiO3)6 with Chromium/Vanadium impurities)
mineral
Banded Gneiss
Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Biotite/Amphiboles)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Vein / Milky Quartz
Silicon Dioxide (SiO2)
mineral
Precious Coral
Corallium rubrum (Calcium carbonate with trace carotene)
Organic gemstone / Sedimentary mineraloid
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Gneiss
Gneiss
metamorphic
Banded Gneiss
Gneiss (quartz-feldspar-biotite metamorphic rock)
metamorphic
Schist with Biotite Inclusion
Biotite-bearing Mica Schist (K(Mg,Fe)3AlSi3O10(F,OH)2)
metamorphic
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Orange Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Amethyst with Marcasite accents
Amethyst (Silicon Dioxide SiO2) and Marcasite (Iron Sulfide FeS2)
mineral
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Biotite Mica
K(Mg,Fe2+)3(Al,Fe3+)Si3O10(OH,F)2
Mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss (specifically Biotite Gneiss)
Gneiss (high-grade metamorphic rock primarily composed of Silicates)
metamorphic
Ruby in Zoisite with Hornblende
Anyolite (Ruby: Al2O3, Zoisite: Ca2Al3(SiO4)3(OH))
metamorphic
River Quartzite (River Rock)
Quartzite (SiO2)
metamorphic
Anthracite Coal
Anthracite C
metamorphic
Pink Feldspar
Orthoclase (KAlSi3O8) or Microcline
mineral