Synthetic Polymer (Polylactic Acid)

Browse synthetic polymer (polylactic acid) specimens identified by the Rock Identifier community.

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Yttrium Aluminum Garnet

Zincite

Opalite

Lead Feldspar

Dolomite

Orange Calcite

Zircon

Travertine (Calcareous Tufa)

Calcium Carbonate (CaCO3)

sedimentary

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

sedimentary

Red Quartzite

Quartzite (primarily SiO2)

metamorphic

Red Coral (Precious Coral)

Corallium rubrum (Calcium Carbonate, CaCO3)

sedimentary

Marble

Metamorphosed Limestone/Dolomite

metamorphic

Sandstone

Clastic Sedimentary Rock (primarily SiO2)

sedimentary

Dyed Pink Agate

Silicon Dioxide (SiO2) - variety Chalcedony

mineral

Pyrite

Iron Sulfide (FeS2)

mineral

Turquoise

Turquoise - CuAl6(PO4)4(OH)8·4H2O

mineral

Turquoise

Hydrated phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O

mineral

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

mineral

Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')

Calcite (CaCO3)

sedimentary

Jade

Jade can refer to two distinct minerals: Nephrite (a variety of the mineral actinolite, Ca2(Mg,Fe)5Si8O22(OH)2) and Jadeite (Na(Al,Fe3+)Si2O6). Based on the image, showing a relatively uniform green color and possibly slight translucence in bead form, it is very likely one of these, but determining which one from a photo is difficult without specific testing.

Mineral/Metamorphic Rock (Nephrite or Jadeite)