Pearl
Aragonite (CaCO3 with conchiolin)
mineral
Category
Mineraloid (Man Made)
Browse mineraloid (man made) specimens identified by the Rock Identifier community.
Learn about Mineraloid (Man Made) in the encyclopedia
View all →
Fossilized Coral (Coquina/Limestone)
Cnidaria Anthozoa (Fossilized)
sedimentary
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Smoky Quartz Cluster
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Diamond (faceted)
Diamond (Pure Carbon, C)
mineral
Quartzite
Metamorphic quartz rock (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Pink Granite
Phaneritic Felsic Igneous Rock
igneous
Diamond (in a jewelry setting)
Cubic Carbon (C)
mineral
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Nacre (Mother of Pearl)
Nacre (Biogenic Aragonite/Calcite composite, CaCO3)
mineral
Diamond
Carbon (C)
gemstone
Sandstone (likely Fossiliferous)
Arenite / Fossiliferous Sandstone (SiO2 composition)
sedimentary
Quartzite
Metamorphic Quartz Arenite
metamorphic
Pearl
Calcium Carbonate (CaCO3) with Conchiolin
mineral
Pearl (Imitation or Cultured)
Calcium Carbonate (Aragonite/Calcite) - CaCO3
Mineraloid (Organic)
Sandstone
Arenite (specifically sublithic or quartz arenite)
sedimentary
Chert (Arrowhead Shard)
Microcrystalline silica (SiO2)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Diamond (Cluster Ring)
Carbon (C)
mineral
Diamond
Carbon (C)
mineral
Chert (Chert / Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Diamond in Kimberlite
Diamond (C in Kimberlite Matrix)
igneous
Pearl
Calcium Carbonate (mostly Aragonite), CaCO3 (with conchiolin)
mineral
Rough Diamond
Diamond (pure Carbon, C)
mineral
Diamond
Native Carbon (C)
mineral
Diamond
Carbon (C)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Diamond
Diamond (Pure Carbon, C)
mineral
Amber
Succinite (specifically Baltic Amber) - Formula: C10H16O (approximate)
Organic Mineraloid
Coquina
Bioclastic Limestone (composed primarily of CaCO3)
sedimentary
Gabbro
Gabbro (composed mainly of calcium-rich plagioclase feldspar and pyroxene)
igneous
Pearl (in a decorative hair comb setting)
Calcium carbonate (CaCO3) primarily as Aragonite, bonded with Conchiolin
Organic Mineraloid
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Quartzite
Quartzite (Metamorphic Quartz Sandstone)
metamorphic
Serpentinite (probable)
Serpentinite, dominated by serpentine-group minerals (Mg₃Si₂O₅(OH)₄), with dark magnetite or chromite and pale carbonate/talc possible
metamorphic
Rough Diamond
Pure Carbon (C)
mineral
Fossilized Shark Tooth (Fragment)
Elasmobranchii gen. et sp. indet. (Calcium Phosphate / Apatite fossil)
fossil
Chert (and Jasper/Chalcedony mixture)
Microcrystalline Quartz (SiO2)
sedimentary
Bituminous Coal (with Anthracite or Vitrinite inclusion)
Organic-rich Sedimentary Rock (Carboniferous classification)
sedimentary