Unidentified gray stone
Likely quartz-rich stone; exact identification is not possible from the image
Category
Browse industrial byproduct (anthropogenic rock like material) specimens identified by the Rock Identifier community.
Unidentified gray stone
Likely quartz-rich stone; exact identification is not possible from the image
Diamond
C (Carbon)
Tiger’s eye
Chatoyant quartz (fibrous quartz pseudomorph after crocidolite), SiO₂
Corundum (Sapphire variant)
Aluminum Oxide (Al2O3)
White Topaz
Aluminum Silicate Fluoride Hydroxide; Al2SiO4(F,OH)2
Vesicular Basalt (Scoria)
Vesicular Basalt
Quartz vein in Schist
Crystalline Silicon Dioxide (SiO2) in Metamorphic Host
Quartz Geode Fragment
Silicon Dioxide (SiO2)
Quartz Pebble
Silicon Dioxide (SiO2)
Banded Iron Formation (BIF)
Banded Iron Formation (Magnetite-Hematite-Chert)
Mica Schist
Foliated Metamorphic Rock (Schist)
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
Pumice
Pumice (Vesicular volcanic glass / Rhyolite or Trachyte)
Chert (with Manganese Dendrites)
Chert (Cryptocrystalline Quartz, SiO2)
K-Feldspar (Potassium Feldspar)
Potassium Feldspar (Microcline or Orthoclase), KAlSi3O8
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
Quartz Pebble
Silicon Dioxide (SiO2)
Unidentifiable Rock Fragment
Limestone
Sedimentary rock composed primarily of Calcium Carbonate (CaCO3)
Orbicular rhyolite (likely)
Rhyolite, a silica-rich volcanic rock; commonly quartz, alkali feldspar, plagioclase, and iron-rich alteration minerals
Chalcopyrite
Chalcopyrite (CuFeS2)
Sandstone (Red)
Arenite (composed primarily of SiO2)
Chert (Jasper) Pebble
Microcrystalline Quartz (SiO2)
Gneissic Granite
Granite Gneiss
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
Sandstone
Clastic Sedimentary Rock
Olivine Peridotite
Peridotite (comprising Olivine (Mg,Fe)2SiO4 and Pyroxene)
Quartz Druzy (Geode Fragment)
Silicon Dioxide (SiO2)
Bauxite (Laterite)
Hydrated aluminum oxides (Al2O3·nH2O)
Eclogite
Eclogite (composed primarily of Omphacite and Pyrope Garnet)
Quartz Pebble
Silicon Dioxide (SiO2)
Coquina
Coquina (Bioclastic Limestone)
Schist
Chlorite or Mica Schist
Sandstone
Sedimentary Clastic Rock (Quartz-rich)
Fossil Shell
Brachiopod or Mollusk fossil
Basalt
Basalt (Volcanic Mafic Rock)
Barite Rose
Barium Sulfate (BaSO4)
Cobalt Blue Sea Glass
Amorphous Silica Glass (SiO2 + CoO)
Diamond (or Cubic Zirconia simulant)
Carbon (C) or Zirconium Dioxide (ZrO2)
Red jasper-like chalcedony pebble
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper
Anthracite Coal
Anthracite (Carbon-based organic sedimentary rock transitioned to metamorphic)
Schist
Mica Schist