Gneiss
Gneiss (a rock type, not a specific mineral with a formula)
Metamorphic Rock
Category
Not A Rock
Browse not a rock specimens identified by the Rock Identifier community.
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Bauxite Ore
Hydrated aluminum oxides (e.g., Gibbsite Al(OH)3, Boehmite ̲̲̲̲AlOOH, Diaspore ̲̲̲̲AlOOH)
Mineral
Man-made Synthetic Material (Not a rock or mineral)
Polyester (Polyethylene terephthalate) / Faux Fur
Synthetic / Textile
Grass (Organic Matter/Soil)
Poaceae (family of monocotyledonous flowering plants)
Organic Materia (Not a rock or mineral)
Granite
Granite (a common rock name, not a single mineral species, composed primarily of quartz, feldspar, and mica/amphibole)
igneous
Pebble
Clast (specifically a granule or small pebble)
Sedimentary
Weathered porphyritic basalt
Basalt, likely plagioclase-phyric basalt; primarily a fine-grained aggregate of plagioclase feldspar, clinopyroxene, and possibly olivine or iron-titanium oxides
igneous
Epidote (or Epidote-rich rock)
Epidote. Mineral formula: Ca2(Al,Fe)3(SiO4)3(OH).
Mineral, often found in metamorphic rocks but also in sedimentary and igneous rocks
Mother of Pearl (Nacre)
Calcium Carbonate (primarily aragonite, with conchiolin)
Organic Gemstone/Biomineral
Baltic Amber (Butterscotch or Egg Yolk Variety)
Succinite (chemical formula: C10H16O)
Organic Gemstone (not a rock or mineral)
Wishing Stone (Quartz-veined Metamorphic/Sedimentary Rock)
Quartz Vein in Greywacke/Slate (SiO2 in host rock)
metamorphic
Granite (weathered cobble)
Granite; chiefly quartz, feldspar, and mica/amphibole
igneous
Granite
Intrusive Igneous Rock
igneous
Sandstone Pebble with Mineral Encrustation
Quartz Sandstone with Calcite/Halite Crust
sedimentary
Man-made earbud charging case (Not a rock or mineral)
Acrylonitrile Butadiene Styrene (ABS) Plastic with electronic components
Synthetic/Man-made object
Nephrite Jade
Nephrite
Mineral/Rock
Granite Pebble with Quartz Vein
Granite (Plutonic Igneous Rock) with Quartz (SiO2)
igneous
Lapis Lazuli
Lapis Lazuli (a rock type, not a single mineral, composed primarily of lazurite, calcite, and pyrite)
Mineral, part of a rock
Red Sandstone
Clastic Sandstone (typically Quartz-rich with Iron Oxide)
sedimentary
Shale
Laminated Mudstone (Shale)
sedimentary
Quartz River Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Basalt with Quartz Vein
Mafic volcanic rock with hydrothermal SiO2 filling
igneous
Gravel / Crushed Stone
Aggregate (mixed mineral rock fragments)
sedimentary
Desert Rose
Gypsum (CaSO4·2H2O) or Barite (BaSO4)
mineral
Puddingstone (Quartzite Pebble)
Metaconglomerate / Jasper-Quartzite Pebble
sedimentary
Quartzite Pebble (River Siltstone/Quartzite)
Quartzite (SiO2 composition)
metamorphic
Shale
Argillite / Shale
sedimentary
Wishing Stone (Quartz Vein in Greywacke / Basalt)
Quartz vein in host rock (e.g. Meta-basalt or Greywacke)
metamorphic
Quartz Vein in Metamorphic Rock
Quartz-veined Schist or Gneiss
metamorphic
Vesicular Basalt
Vesicular Basalt
igneous
Fossilized Brachiopod or Gastropod in Chert/Limestone
Phylum Brachiopoda / Mollusca
fossil
Quartz with Mafic/Chlorite Veins
Silicon Dioxide (SiO2) with Chlorite/Epidote cross-veining
metamorphic
Quartzite with Quartz Veining
Metamorphic Quartzite (SiO2)
metamorphic
Fossilized wood (petrified wood)
Silicified wood; commonly quartz/chalcedony (SiO₂) replacing wood tissue
fossil
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Granite Pebbles
Granite (composed primarily of Quartz SiO2, Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8), and Mica)
igneous
Unidentified rock fragments
Indeterminate; likely a weathered, iron-stained silicate rock
mineral
Vesicular Basalt (Lava Rock)
Vesicular Basalt
igneous