Pearl
Calcium Carbonate (mostly Aragonite), CaCO3 (with conchiolin)
Category
Browse man made glass mineral simulant specimens identified by the Rock Identifier community.
Pearl
Calcium Carbonate (mostly Aragonite), CaCO3 (with conchiolin)
Nacre (Mother of Pearl)
Nacre (Biogenic Aragonite/Calcite composite, CaCO3)
Diamond (in jewelry setting)
Carbon (C)
Diamond (in jewelry setting)
Adamantine Carbon (C)
Specular Hematite (Specularite)
Iron Oxide (Fe2O3)
Chert (and/or Flint)
Chert (Cryptocrystalline variety of Quartz, SiO2)
Granite (weathered pebble)
Granite (plutonic igneous rock)
Diorite (Gneissic)
Diorite
Granite
Phaneritic Plutonic Felsic Rock
Chert (Field-collected Arrowhead-shaped Fragment)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
Vesicular Basalt (or Scoria)
Vesicular Basalt
Engineered Quartz Stone
Agglomerated Quartz (SiO2 + Polymer Resin)
River Pebbles (Chert and Quartzite)
Sedimentary Clastic Rock (Silica-rich)
Red Sandstone
Quartz Arenite (iron-stained) / SiO2
Quartz Sandstone Pebble
Sandstone (SiO2 dominated)
Geode (Unopened)
Quartz Geode (SiO2) / Chalcedony Concretion
Chert (specifically Jasper or Flint variety)
Cryptocrystalline Quartz (SiO2)
Chert
Sedimentary cryptocrystalline quartz (SiO2)
Fossilized oyster shell
Bivalvia; likely an oyster (Ostreidae), partly mineralized with calcite
Sandstone
Arenite
Obsidian
Obsidian (volcanic glass)
Coal (Anthracite / Bituminous)
Organic Sedimentary Rock (Carbon-based)
Chert (Tan/Brown variety)
Chert (Silicon Dioxide, SiO2)
Granite
Phaneritic Felsic Igneous Rock
Sunstone
Andesine-Labradorite Feldspar ((Ca,Na)(Al,Si)4O8)
Desert Rose (Gypsum)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
Amazonite
K(AlSi3O8) - Potassium Aluminum Silicate (color due to lead)
Pearl
Aragonite (CaCO3 with conchiolin)
Coquina
Biogenic Limestone (Calcite/Aragonite base, CaCO3)
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
Chert (Nodular or Massive Variety)
Cryptocrystalline Quartz (SiO2)
Pyrulite (Pyrite / Chalcopyrite)
Iron Sulfide (FeS2) or Copper Iron Sulfide (CuFeS2)
Flint/Chert Nodule in Limestone
Sedimentary rock containing microcrystalline quartz (SiO2) within a calcium carbonate (CaCO3) matrix
Chert (and Jasper/Chalcedony mixture)
Microcrystalline Quartz (SiO2)
Chert (Nodule)
Chert (SiO2)
Blue-beaded gemstone jewelry, likely lapis lazuli or dyed blue agate
Uncertain from the image; possible lazurite-bearing lapis lazuli (Na₃Ca(Si₃Al₃)O₁₂S) or blue chalcedony (SiO₂)
Amber (Copal)
Organic gemstone, fossilized tree resin (often immature amber or copal)
Chert (specifically Zebra Chert/Flint)
Silicon Dioxide (SiO2)
Desert Rose (Gypsum Rose)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
Yooperlite (Syenite clast containing fluorescent Sodalite)
Sodalite-bearing Syenite
Pyrite
Iron Sulfide (FeS2)