Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Category
Sedimentary Or Igneous
Browse sedimentary or igneous specimens identified by the Rock Identifier community.
Yellow Chalcedony (Agate Pebble)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Gneiss
Gneiss
metamorphic
Blue Calcite (commonly sold as Caribbean Calcite)
Calcium Carbonate (CaCO3)
mineral
Specular Hematite (Specularite)
Iron Oxide (Fe2O3)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Blue Chalcedony
Microcrystalline Quartz (SiO2)
mineral
River Cobble (Salt and Pepper Gneiss)
Gneiss (High-grade regional metamorphic rock)
metamorphic
Clear Quartz Crystal
Quartz (Silicon Dioxide, SiO2)
mineral
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
White Agate (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Gneiss (Metamorphic Rock)
Gneiss
metamorphic
Gneiss
Gneissic Metamorphic Rock
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Pink Calcite (Mangano Calcite)
Calcium Carbonate (CaCO3)
mineral
Pyrite (on the right) and Magnetite or Hematite (on the left)
Iron Sulfide (FeS2) and Iron Oxide (Fe3O4 or Fe2O3)
mineral
Quartz (Peach/Orange variety)
Silicon Dioxide (SiO2)
mineral
Gneiss (specifically Granite Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Clear Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Amethyst
Amethyst (Silicon Dioxide - SiO2 with iron impurities)
mineral
Specular Hematite
Hematite (Fe2O3)
mineral
Carnelian Agate
Carnelian (Silicon Dioxide - SiO2)
mineral
Biotite (Black Mica)
Biotite - K(Mg,Fe)3AlSi3O10(F,OH)2
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Quartz (likely Rose Quartz or Milky Quartz based on color)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Banded Agate (specifically Sardonyx or Carnelian Agate)
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Quartz (Silicon Dioxide, SiO2)
Mineral
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral