Graywacke
Graywacke (immature sandstone)
sedimentary
Category
Mineral, Specifically A Rock Fragment
Browse mineral, specifically a rock fragment specimens identified by the Rock Identifier community.
Gneiss
Gneiss
metamorphic
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Amazonite
Amazonite (KAlSi3O8, a variety of Microcline)
mineral
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Yellow Quartz (Citrine appearance)
Silicon Dioxide (SiO2)
mineral
Blue Topaz (facetted in jewelry)
Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)
mineral
Sandstone Chert/Quartzite
Silicon Dioxide (SiO2) - Sedimentary Sandstone / Orthoquartzite
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Chert (variations include Flint or Jasper)
Cryptocrystalline Quartz (SiO2)
sedimentary
Rose Quartz
Quartz (SiO₂), specifically a variety of Quartz
Mineral
Carnelian
Carnelian (Silicon Dioxide, SiO2)
mineral
Fossiliferous Limestone (Coquina / Shell Limestone)
Biogenic Limestone (CaCO3)
sedimentary
Jadeite (Jade)
Jadeite (NaAlSi2O6)
metamorphic
Blue Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Fossiliferous Limestone
Calcite (CaCO3) Rich Bio-sedimentary Rock
sedimentary
Sunstone (Oregon Sunstone)
Labradorite (Feldspar variety) - (Ca, Na)(Al, Si)4O8
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Conglomerate with Native Copper
Clastic Sedimentary Rock with Native Copper (Cu)
sedimentary
Fulgurite
Lechatelierite (Silica glass), typically SiO2
mineraloid
Chert (Flint Nodular Variety)
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Jasper / Chert
Silicon Dioxide (SiO2) with Goethite or Limonite inclusions
sedimentary
Milky Quartz
Quartz / Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Iron Meteorite (likely Chondrite or weathered Iron-Nickel)
Meteorite (Fe-Ni alloy & silicates)
igneous
Quartz with mica and feldspar (Pegmatite fragment)
Granitic Pegmatite (composed mainly of SiO2 with KAlSi3O8)
igneous
Pumice (specifically a water-worn, weathered variety)
Vesicular volcanic glass
igneous
Rough Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Brick
Fired clay or Ceramic material (no specific mineralogical scientific name as it's a composite)
Man-made material (constructed)
Concrete with Aggregate
Artificial Conglomerate (Cement and Aggregate)
sedimentary
Blue Goldstone
Aventurine Glass (Silicon Dioxide with metal inclusions)
man-made glass mineral simulant
Black Pearl (Tahitian-style Cultured Pearl)
Calcium Carbonate (Aragonite) with Conchiolin (CaCO3)
mineral
Amethyst (Chevron Amethyst)
Silicon Dioxide (SiO2) with iron impurities
mineral
Sunstone with Black Tourmaline (Arfvedsonite)
Feldspar (Na,Ca)(Al,Si)4O8 with Schorl Na(Fe3+)3Al6(Si6O18)(BO3)3(OH)3(OH)
mineral
Citrine
Silicon Dioxide (SiO2) with iron impurities
mineral
Charoite
Charoite (Hydrated potassium sodium calcium barium strontium silicate hydroxyfluoride)
metamorphic
Aventurine Quartz
Silicon Dioxide (SiO2) with inclusions (typically Fuchsite/Mica)
metamorphic
Amazonite
Potassium Feldspar (KAlSi3O8), specifically Microcline
mineral
Moonstone
Orthoclase Feldspar (specifically showing adularescence)
Mineral