Nacre (Mother of Pearl)
Nacre (Biogenic Aragonite/Calcite composite, CaCO3)
mineral
Category
Mineral Based Composite
Browse mineral based composite specimens identified by the Rock Identifier community.
Learn about Mineral Based Composite in the encyclopedia
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Asphalt Concrete (Bituminous Pavement)
Aggregates in Bitumen Matrix
Technogenic / Anthropogenic Pavement Material
Concrete / Anthropogenic Conglomerate
Man-made composite material (Portland cement, aggregate, and water)
not a natural rock
Sandstone Pebble
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (predominantly SiO2)
sedimentary
Unidentified polished mineral fragment
Likely quartz-bearing stone; exact identification is impossible from the blurred photograph
mineral
Concrete
Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)
sedimentary (anthropogenic / man-made)
Terrazzo (Synthetic Composite Rock)
Cementitious or Epoxy Resin-bound Aggregates
Man-made metamorphic-style composite
Copper Composite Turquoise (Purple and Blue)
Composite Hydrous copper aluminum phosphate with bronze/copper matrix binding
gemstone
Digital Multimeter (Synthetic Object)
Digital Multimeter (DMM)
not a rock
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone (Pebble)
Arenite (SiO2 based)
sedimentary
Opal (in Jewelry Setting)
Hydrated Silicon Dioxide (SiO2·nH2O)
gemstone
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone Pebble
Arenite (SiO2 based)
sedimentary
Unknown Tumbled Stone
Unknown (Too Blurry)
mineral
Tiger Iron
Composite rock (Quartz, Tiger's Eye, Hematite, and Jasper)
metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Generic Rock Fragment
Rock Fragment
sedimentary
Onyx (Black) and Mother of Pearl Inlay
Silicon Dioxide (SiO2) for Onyx; Aragonite (CaCO3) for Mother of Pearl
mineral
Marble
Metamorphosed Limestone (principally CaCO3)
metamorphic
Connemara Marble
Calcitic Marble / Serpentinite composite
metamorphic
Quartz (Agate/Chalcedony)
Silicon Dioxide (SiO2)
mineral
Blue-green quartz-rich stone, possibly chrysoprase or aventurine
Uncertain; likely quartz (SiO₂) with green coloration from nickel-bearing minerals or inclusions
mineral
Magnetic Hematite (Man-made)
Iron Oxide (Fe2O3) with Barium-Strontium Ferrite
mineral
Tumbled turquoise-bearing stone (likely turquoise or chrysocolla)
Turquoise: CuAl₆(PO₄)₄(OH)₈·4H₂O; possible chrysocolla: hydrated copper silicate
mineral
Sandstone
Sandstone (clastic sedimentary rock composite)
sedimentary
Jasper and Chalcedony Composite
Silicon Dioxide (SiO2) microcrystalline quartz
sedimentary
Polished turquoise sphere with purple matrix/inclusion
Turquoise, hydrated copper–aluminum phosphate; approximate formula CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Feldspar-Quartz Rock (likely Pegmatite or Granite)
Feldspar-Quartz composite rock (KAlSi3O8 - SiO2)
igneous
Asphalt aggregate pavement
Bituminous asphalt concrete containing crushed stone aggregate
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone Pebble
Arenite (SiO2 based)
sedimentary
Sandstone (likely Conglomerate or Gritstone)
Arenite (SiO2 based)
sedimentary
Coarse Sandstone
Arenite (SiO2 based)
sedimentary
N/A (Non-Geological Object)
N/A
Mixed gemstone bead strand, likely including agate, quartz, turquoise, and sandstone beads
Varied silicate and copper-mineral materials; exact bead identities cannot be confirmed visually
mineral
Polished tiger iron
Tiger iron: banded quartz (SiO₂), red jasper, and crocidolite-derived fibrous iron oxides
metamorphic
Quartz / Common Opal Transition
Silicon Dioxide (SiO2)
mineral
Schist
Schist
metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary