Schist
Mica Schist
metamorphic
Category
Mineral (Evaporite)
Browse mineral (evaporite) specimens identified by the Rock Identifier community.
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Granite
Granite (a phaneritic intrusive igneous rock consisting mainly of quartz, alkali feldspar, and plagioclase)
igneous
Quartzite
Quartzite (Primary mineral: Quartz, SiO2)
metamorphic
Picture Jasper
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Fancy Jasper
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Ocean Jasper (Orbicular Jasper)
Silica (SiO2) with varied mineral inclusions
mineralogical specimen
Picture Jasper
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Sandstone (likely Siltstone variety)
Arenite / Siltstone (primary mineral SiO2)
sedimentary
Chert (Serpentinized)
Silicon Dioxide (SiO2) with mineral staining
sedimentary
Granite (Phaneritic Igneous Rock)
Granite
igneous
Strawberry Quartz
Quartz (SiO2) with inclusions of Goethite or Hematite
Mineral
Blue Quartzite (Aventurine)
Silicon Dioxide (SiO2) with mineral inclusions
metamorphic
Gabbro
Basaltic Plutonic Rock (Gabbro)
igneous
Auriferous Quartz (Gold-bearing Quartz)
Silicon Dioxide (SiO2) with trace Gold (Au) and Iron Oxides
mineral
Prehnite
Prehnite - Ca2Al(AlSi3O10)(OH)2
mineral
Silver (Native Element)
Ag (Argentum)
mineral
Amygdaloidal Basalt with Epidote
Vesicular Basalt with secondary Epidote/Quartz mineral infill
igneous
Bauxite
Alumina ore (Mixture of Gibbsite, Boehmite, and Diaspore)
sedimentary
Limonite
Hydrous Iron Oxide (often Goethite FeO(OH), Lepidocrocite γ-FeO(OH), and other amorphous iron oxyhydroxides)
Mineral
Amygdaloidal Basalt
Amygdaloidal Basalt
igneous
Sandstone (Calcareous or Ferruginous)
Clastic sedimentary rock (SiO2 with CaCO3 or Fe2O3 cement)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Magnetite (in matrix)
Magnetite (Fe3O4)
mineral
Vesicular Basalt with Amygdaloidal Infill
Basalt (Mafic Extrusive Igneous Rock)
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Azurite-Malachite (often a mixed specimen)
Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2(CO3)(OH)2. The specimen appears to be a natural mixture or intergrowth of these two minerals.
Mineral
Brecciated Chert
Sedimentary Chert (SiO2) with Calc-Silicate mineralization
sedimentary
Jasper (var. Ocean or Polychrome Jasper)
Silicon Dioxide (SiO2) with iron and mineral inclusions
sedimentary
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Olivine (Peridotite)
Magnesium iron silicate (Mg, Fe)2SiO4
igneous
Gneiss
Gneissic Metamorphic Rock
metamorphic
Gneiss
Gneiss (High-grade Regional Metamorphism)
metamorphic
Magnetite / Ironstone Pebble
Magnetite (Fe3O4)
mineral
Chrysocolla
Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Yellow Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Granite
Phaneritic Igneous Rock (Granite)
igneous
Granite Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Bumblebee Jasper
Fibrous Calcite with Arsenic and Sulfur inclusions
mineral
Yellow Quartz (Citrine or Quartzite Pebble)
Silicon Dioxide (SiO2)
mineral