Mixed tumbled gemstone collection
Varied minerals, likely including amethyst, sodalite/lapis lazuli, quartzite or aventurine, jasper, and agate/chalcedony
gemstone
Category
Man Made Material
Browse man made material specimens identified by the Rock Identifier community.
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Diamond
Carbon (C)
mineral
Red Quartzite
Quartzite (Metamorphic quartz sandstone)
metamorphic
Aragonite
Aragonite (Calcium Carbonate - CaCO3)
mineral
Sandstone (Pebble)
Sandstone (SiO2 with matrix/cement)
sedimentary
Goldstone (aventurine glass)
Synthetic copper-bearing soda-lime glass; commonly sold as red goldstone
gemstone
Diamond
Carbon (C)
mineral
Quartz (likely)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Smoky Quartz Cluster
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Pearl
Aragonite (CaCO3 with conchiolin)
mineral
Yellow calcite (tumbled honey or lemon calcite)
Calcite, calcium carbonate (CaCO₃), likely a yellow/orange calcite variety
mineral
Pebble (likely a type of sandstone or quartzite pebble)
Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.
Sedimentary rock
Diamond (faceted)
Diamond (Pure Carbon, C)
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Diamond (in a jewelry setting)
Cubic Carbon (C)
mineral
Quartz Geode/Druzy Quartz
Quartz (SiO₂)
Mineral
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Pearl
Calcium Carbonate (CaCO3) with Conchiolin
mineral
Fossil shell fragment
Indeterminate molluscan bioclast, likely aragonite or calcite
fossil
Quartzite
Metamorphic Quartz Arenite
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Aquamarine and clear quartz
Aquamarine (Be3Al2Si6O18), Quartz (SiO2)
Mineral
Diamond (Cluster Ring)
Carbon (C)
mineral
Diamond
Carbon (C)
mineral
Pearl
Calcium Carbonate (mostly Aragonite), CaCO3 (with conchiolin)
mineral
Diamond in Kimberlite
Diamond (C in Kimberlite Matrix)
igneous
Rough Diamond
Diamond (pure Carbon, C)
mineral
Diamond
Native Carbon (C)
mineral
Amazonite
Microcline feldspar (KAlSi₃O₈), green variety
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Tumbled chalcedony (likely milky quartz)
Chalcedony, cryptocrystalline SiO₂; possibly quartz-rich chert
mineral
Quartz (variety of colors)
SiO2 (Silicon Dioxide)
Mineral
Coquina
Bioclastic Limestone (composed primarily of CaCO3)
sedimentary
Turquoise
Turquoise (CuAl6(PO4)4(OH)8·4H2O)
mineral
Quartzite
Quartzite (Metamorphic Quartz Sandstone)
metamorphic
Clear Quartz (or Rock Crystal)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Fossilized Shark Tooth (Fragment)
Elasmobranchii gen. et sp. indet. (Calcium Phosphate / Apatite fossil)
fossil
Mixed rock and mineral specimen collection
Multiple species, likely quartz (SiO₂), calcite (CaCO₃), feldspar, chert, and assorted volcanic/sedimentary rocks
mineral