Prehnite on Basalt
Prehnite - Ca2Al(AlSi3O10)(OH)2
mineral
Category
Metamorphic (Pseudo Igneous)
Browse metamorphic (pseudo igneous) specimens identified by the Rock Identifier community.
Blue Sapphire (faceted in jewelry)
Corundum (Al2O3)
mineral
Magnetite / Iron Ore
Magnetite (Fe3O4)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Sodalite
Sodium aluminum silicate chloride (Na8(Al6Si6O24)Cl2)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Specular Hematite (Specularite)
Hematite (Iron(III) oxide) - Fe2O3
mineral
Yellow Aventurine
Quartz (Silicon Dioxide) with Mica inclusions (SiO2)
mineral
Magnetite (likely with weathered Limonite/Hematite)
Magnetite (Fe3O4) with iron oxide weathering
mineral
Rhodolite Garnet
Magnesium Aluminum Silicate; formula: (Mg,Fe)3Al2(SiO4)3
mineral
Black Sapphire
Corundum (Al2O3)
mineral
Pyrite (on Quartz matrix)
Iron Sulfide (FeS2)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
igneous
Blue Sapphire
Corundum (Al2O3 - Aluminum Oxide)
mineral
Black Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral
Sodalite
Na8(Al6Si6O24)Cl2 (Sodium Aluminum Silicate Chloride)
mineral
Feldspar (specifically Orthoclase)
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Ruby
Corundum (Aluminium Oxide with Chromium impurities, Al2O3:Cr)
mineral
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Almandine Garnet
Almandite (Fe3Al2(SiO4)3)
Mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Ruby (Raw/Rough)
Corundum (Al2O3 with Chromium trace)
mineral
Chrome Diopside
Diopside (Magnesium Calcium Silicate) - CaMgSi2O6 + Cr
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Lapis Lazuli
Lapis Lazuli (a rock composed primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2, with varying amounts of Calcite, Pyrite, and Sodalite).
Mineral
Nephrite Jade
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)
Mineral