Limestone Pebble
Calcium Carbonate (CaCO3)
sedimentary
Category
Mineral (Synthetic Paper And Ink Polymorph)
Browse mineral (synthetic paper and ink polymorph) specimens identified by the Rock Identifier community.
Learn about Mineral (Synthetic Paper And Ink Polymorph) in the encyclopedia
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Diamond (Faceted)
Carbon (C)
gemstone
Dyed Quartzite
Metamorphosed Quartz (SiO2) with synthetic pigment
metamorphic
Blue Goldstone
Aventurine Glass (SiO2 with Cobalt/Copper inclusions)
man-made glass
Anthracite Coal
Anthracite (Carbon-based organic sedimentary rock transitioned to metamorphic)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone (Brecciated/Recrystallized)
Calcium Carbonate (CaCO3)
sedimentary
Blue Goldstone
Synthetic glass with cobalt and copper inclusions
man-made glass
Agate
Agate (a variety of Chalcedony, SiO2)
Mineral
Agate
Agate (a cryptocrystalline variety of Quartz, SiO₂)
Mineral
Faceted yellow gemstone, likely citrine
Citrine (quartz), SiO₂; possibly yellow sapphire or synthetic glass without testing
gemstone
Limestone
Calcium carbonate (CaCO3)
sedimentary
Chalk / Sedimentary Limestone
Calcium Carbonate (CaCO3) - Biogenic Sedimentary Rock
sedimentary
Limestone (specifically Fossiliferous or Crinoidal Limestone)
Calcium Carbonate (CaCO3) - Calcite Rock
sedimentary
Diamond
Diamond (C - Pure Carbon)
gemstone
Green glassy cabochon, likely dyed or synthetic material
Uncertain; possibly green obsidian, chrysoprase, or synthetic glass
gemstone
Yellow-orange faceted gemstone, likely citrine or yellow topaz
Citrine: quartz, SiO₂; yellow topaz: Al₂SiO₄(F,OH)₂
gemstone
Likely citrine or yellow glass imitation in a silver-tone bracelet
Citrine: quartz, SiO₂; exact material cannot be confirmed visually
gemstone
Ring with an Orange Inlay
N/A (Man-made object)
Man-made Object (Ring)
Granite
Phaneritic intrusive igneous rock
igneous
Polished fossiliferous limestone, likely crinoidal or coral limestone
Calcite (CaCO₃), fossiliferous carbonate rock
fossil
Porphyritic Basalt (Flowerstone)
Porphyritic Basalt (Mafic volcanic rock)
igneous
Cultured Marble (Synthetic)
Polymer-matrix composite (typically calcium carbonate in polyester resin)
Synthetic / Composite Material
Porphyry
Porphyritic Andesite/Dacite
igneous
Shungite
Carbonaceous rock (primarily amorphous carbon)
Mineraloid
Synthetic Convention Badge (Plastic/PVC)
Polyvinyl Chloride (PVC) / Polycarbonate
mineraloid (synthetic)
Quartzite
Quartzite (SiO2)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Diamond (Baguette cut)
Carbon (C)
gemstone
Agate (various color varieties)
SiO₂ (Silicon Dioxide)
Mineral (specifically a variety of Chalcedony, which is a microcrystalline quartz)
Opalite (a synthetic glass, often confused with Opal)
Silicon dioxide glass (SiO2nH2O, for natural opal)
Synthetic (glass)
Diamond (Heart Cut)
Carbon (C)
gemstone
Blue Goldstone
Synthetic glass with copper or cobalt/manganese inclusions
man-made glass
Blue Goldstone
Auraventurine (Synthetic glass with cobalt and copper inclusions)
Synthetic (Man-made Glass)
Amber
Succinite (specifically for Baltic amber; general formula C10H16O)
Mineraloid (Organic)
Terrazzo (Synthetic Composite Rock)
Cementitious or Epoxy Resin-bound Aggregates
Man-made metamorphic-style composite
Diamond
Carbon (C)
gemstone
Rough Diamond (Uncut Diamond)
Native Carbon (C)
gemstone
Wood Beads (Palmwood/Ebony)
Various species for wood, but often refers to woods like Palmwood (e.g., Borassus flabellifer) or Ebony (Diospyros spp.) for their distinctive grain and hardness.
Organic Gem Material (Botanical)
Concrete Paver (Artificial Cementitious Rock)
Hydrated Portland Cement Aggregate
Sedimentary (Synthetic)