Quartzite
Quartzite (SiO2)
metamorphic
Category
Synthetic Polymer (Polylactic Acid)
Browse synthetic polymer (polylactic acid) specimens identified by the Rock Identifier community.
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Calcite on Matrix
Calcium Carbonate (CaCO3)
mineral
Quartzite with Quartz Veining
Quartzite (primarily SiO2)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Calcite
Calcium Carbonate (CaCO3)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Turquoise (Dyed Howlite or Magnesite imitation)
Hydrated phosphate of copper and aluminum / CuAl6(PO4)4(OH)8·4H2O
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
River Stone (Limestone)
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Turquoise (Dyed Howlite/Magnesite)
CuAl6(PO4)4(OH)8·4H2O (Natural Turquoise) or Ca2B5SiO9(OH)5 (Howlite)
mineral
Limestone with Fossil Impression
Calcium Carbonate (CaCO3)
sedimentary
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)
Limestone
Limestone (Calcium Carbonate, CaCO3)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Fossiliferous Limestone with Coral Imprint
Fossiliferous Limestone (CaCO3)
sedimentary
Fossiliferous Limestone
Fossiliferous Calcarenite (CaCO3)
sedimentary
Limestone
Limestone (Calcium Carbonate, CaCO3)
Sedimentary
Coquina / Shelly Limestone
Coquina (Biogenic Limestone)
sedimentary
Crushed Limestone
Calcium Carbonate (CaCO3)
sedimentary
Amber (Copal)
Organic gemstone, fossilized tree resin (often immature amber or copal)
Mineral
Amber (Black)
Amber (succinite, retinite, etc., specifically, heavily included/dark varieties)
Mineraloid
Limestone
Calcium Carbonate (CaCO3)
sedimentary
River Quartz Cobble
Silicon Dioxide (SiO2)
mineral
Quartzite River Rock
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite (River Stone)
Quartzite (SiO2)
metamorphic
Fossiliferous Limestone
Biogenic Calcium Carbonate (CaCO3)
sedimentary
Limestone Pebble
Limestone (Calcium Carbonate - CaCO3)
sedimentary
White Quartz Pebble
Silicon Dioxide (SiO2)
mineral
River Pebble (Quartzite)
Quartzite (SiO2)
metamorphic
Limestone (Micritic)
Sedimentary rock mainly composed of Calcium Carbonate (CaCO3)
sedimentary
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz on Limestone
Silicon Dioxide (SiO2) on Calcium Carbonate (CaCO3)
Mineral on Sedimentary
Kidney Stone
Calcium Oxalate (CaC2O4·nH2O)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (within Limestone matrix)
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Blue Calcite
Calcium Carbonate (CaCO3)
mineral