Pearl
Organic gemstone (Calcium carbonate - CaCO3)
mineral
Category
Man Made Glass (Not A Natural Rock Or Mineral)
Browse man made glass (not a natural rock or mineral) specimens identified by the Rock Identifier community.
Learn about Man Made Glass (Not A Natural Rock Or Mineral) in the encyclopedia
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Asphalt Pavement (with aggregate)
Asphalt concrete
man-made composite
Granite
Granite (a phaneritic intrusive igneous rock consisting mainly of quartz, alkali feldspar, and plagioclase)
igneous
Sandstone (likely Conglomerate or Gritstone)
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone or Limestone
Arenite or Calcareous Sedimentary Rock
Sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Clastic sedimentary rock (Quartz arenite)
sedimentary
Synthetic Marbled Aggregate (Footwear Component)
Ethylene-vinyl acetate (Croslite™)
not a rock (man-made polymer)
Diamond
Carbon (C)
mineral
Green Aura Quartz
Silicon Dioxide (SiO2) bonded with metallic vapors (typically Gold, Chromium, or Titanium)
mineral
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Ferruginous Conglomerate (or Iron-Rich Concrete/Slag)
Clastic Sedimentary (Silicon Dioxide/Iron Oxide matrix)
sedimentary
Sandstone
Arenite (SiO2 based clastic rock)
sedimentary
Dragon Vein Agate (Dyed/Treated)
Agate (SiO2)
mineral
Diamond (or Diamond Simulant)
Carbon (C)
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Polished blue calcite sphere (tentative identification)
Calcite, CaCO₃; blue color generally results from trace impurities or inclusions
mineral
Red Sandstone or Brick Fragment
Arenite (if sandstone)
sedimentary
Sandstone (Pebble)
Sandstone (SiO2 with matrix/cement)
sedimentary
Engineered Quartz Stone
Agglomerated Quartz (SiO2 + Polymer Resin)
mineral-based composite
Brecciated Jasper
Brecciated Jasper (Microcrystalline Quartz / SiO2)
sedimentary
Diamond (in Jewelry)
Carbon (C)
mineral
Sandstone
Arenite (specifically sublithic or quartz arenite)
sedimentary
Blue-dyed Quartz Druzy
Silicon Dioxide (SiO2) with artificial pigment
mineral
Seven Chakra Bonded Stone
Bonded composite of Red Jasper, Carnelian, Tiger's Eye, Aventurine, Lapis Lazuli, Amethyst, and Clear Quartz
metamorphic
Orgonite Pyramid (containing Amethyst and mixed minerals)
Silicon Dioxide (SiO2) in synthetic resin
gemstone
Sandstone
Arenite (primarily SiO2)
sedimentary
Blue Chalcedony (likely dyed Agate)
Silicon Dioxide (SiO₂)
mineral
Sandstone (Quartz Arenite)
Sandstone (dominated by SiO2 quartz grains)
sedimentary
Natural or Cultured Pearl
Calcium Carbonate (Aragonite and Conchiolin), CaCO3
Mineral (Organic)
Quartz Pebble (Beach Chalcedony)
Silicon Dioxide (SiO2)
mineral
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Obsidian
Volcanic Glass (Amorphous silicon dioxide with impurities)
igneous
Polished white chalcedony or milky quartz pebble
Chalcedony, microcrystalline quartz (SiO₂), possibly with iron-oxide staining or a minor mineral inclusion
mineral
Goldstone and Aura Quartz
Cuprous Glass (Goldstone) and Titanium-coated SiO2 (Aura Quartz)
Mineral/Glass Specimen
Red gemstone ring, likely garnet or synthetic ruby
Possibly almandine garnet (Fe₃Al₂(SiO₄)₃) or corundum/ruby (Al₂O₃); image alone cannot distinguish
gemstone
Sandstone
Clastic Sedimentary Rock
sedimentary
Smooth river pebble
Indeterminate lithology; likely fine-grained quartz-rich sandstone, siltstone, or weathered chert
sedimentary
Sandstone
Arenite
sedimentary
Rutilated Quartz
Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions
mineral