Rock Identifier

Category

Synthetic Polymer (Polylactic Acid)

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

Learn about Synthetic Polymer (Polylactic Acid) in the encyclopedia

Yttrium Aluminum Garnet

Yttrium Aluminum Garnet

Zincite

Opalite

Lead Feldspar

Dolomite

Zircon

Orange Calcite

Blue Sapphire (Corundum (Al2O3)) — mineral

Blue Sapphire

Corundum (Al2O3)

Cubic Zirconia (Set in Jewelry) (Zirconium Dioxide (ZrO2)) — gemstone

Cubic Zirconia (Set in Jewelry)

Zirconium Dioxide (ZrO2)

Diamond (or Cubic Zirconia) (Carbon (C) or Zirconium Dioxide (ZrO2)) — gemstone

Diamond (or Cubic Zirconia)

Carbon (C) or Zirconium Dioxide (ZrO2)

Ruby (Corundum (Al2O3)) — gemstone

Ruby

Corundum (Al2O3)

Amber (Succinite (Fossilized Tree Resin)) — fossil

Amber

Succinite (Fossilized Tree Resin)

Amber (Copal) (Succinate (Fossilized Resin)) — mineraloid

Amber (Copal)

Succinate (Fossilized Resin)

Decorative opal-like turtle mosaic (Likely imitation or assembled opal material; exact stones cannot be confirmed visually) — gemstone

Decorative opal-like turtle mosaic

Likely imitation or assembled opal material; exact stones cannot be confirmed visually

Silicon Carbide (Carborundum) (Silicon Carbide (SiC)) — mineral

Silicon Carbide (Carborundum)

Silicon Carbide (SiC)

Red Agate (Carnelian) (Silicon Dioxide (SiO2)) — gemstone

Red Agate (Carnelian)

Silicon Dioxide (SiO2)

Carnelian (Carnelian (Cryptocrystalline Quartz, SiO2)) — mineral

Carnelian

Carnelian (Cryptocrystalline Quartz, SiO2)

Hematite (Iron(III) oxide (Fe2O3)) — mineral

Hematite

Iron(III) oxide (Fe2O3)

Sedimentary Rock with Crafts (Pet Rock) (Sedimentary rock decorated with synthetic materials) — sedimentary

Sedimentary Rock with Crafts (Pet Rock)

Sedimentary rock decorated with synthetic materials

Opalite (Synthetic Glass (Simulated Moonstone/Opal)) — gemstone

Opalite

Synthetic Glass (Simulated Moonstone/Opal)

Opalite (Synthetic glass (SiO2 + metal additions)) — mineraloid

Opalite

Synthetic glass (SiO2 + metal additions)

Opalite (Synthetic Opalite (Man-made glass)) — mineral

Opalite

Synthetic Opalite (Man-made glass)

Pink Dyed Agate (Silicon Dioxide (SiO2) with synthetic pigment) — mineral

Pink Dyed Agate

Silicon Dioxide (SiO2) with synthetic pigment

Dyed Quartzite (Metamorphosed Quartz (SiO2) with synthetic pigment) — metamorphic

Dyed Quartzite

Metamorphosed Quartz (SiO2) with synthetic pigment

Dyed Crackle Quartz (Silicon Dioxide (SiO2) with synthetic dye) — mineral

Dyed Crackle Quartz

Silicon Dioxide (SiO2) with synthetic dye

Opalite (Synthetic Opalized Glass (SiO2 + additives)) — mineraloid (man-made)

Opalite

Synthetic Opalized Glass (SiO2 + additives)

mineraloid (man-made)

Opalite (Synthetic Opalized Glass) (Synthetic Silicon Dioxide (SiO2) glass) — mineral

Opalite (Synthetic Opalized Glass)

Synthetic Silicon Dioxide (SiO2) glass

Goldstone (N/A (Synthetic Glass with Copper Inclusions)) — Manufactured Glass

Goldstone

N/A (Synthetic Glass with Copper Inclusions)

Manufactured Glass

Opalite (Synthetic Opalite Glass (Silicon Dioxide)) — mineraloid (man-made)

Opalite

Synthetic Opalite Glass (Silicon Dioxide)

mineraloid (man-made)

Dyed Agate (Silicon Dioxide (SiO2) with synthetic dyes) — mineral

Dyed Agate

Silicon Dioxide (SiO2) with synthetic dyes

Opalite crescent pendant (Opalite (man-made opalescent glass; not a natural mineral)) — gemstone

Opalite crescent pendant

Opalite (man-made opalescent glass; not a natural mineral)

Quartz (Druzy / Goldstone Gemstone Cabochon) (Silicon Dioxide (SiO2)) — gemstone

Quartz (Druzy / Goldstone Gemstone Cabochon)

Silicon Dioxide (SiO2)

Colorless faceted gemstone, likely cubic zirconia (Synthetic cubic zirconia (zirconium dioxide, ZrO₂); identity is visual and not definitive) — gemstone

Colorless faceted gemstone, likely cubic zirconia

Synthetic cubic zirconia (zirconium dioxide, ZrO₂); identity is visual and not definitive

Rose Quartz and Cherry Quartz (Dyed Glass/Quartz) (Silicon Dioxide (SiO2) with inclusions/dye) — gemstone

Rose Quartz and Cherry Quartz (Dyed Glass/Quartz)

Silicon Dioxide (SiO2) with inclusions/dye

Opalite (Man-made opalescent glass) — gemstone

Opalite

Man-made opalescent glass

Diamond (or Cubic Zirconia) (Carbon (C) or Zirconium Dioxide (ZrO2)) — gemstone

Diamond (or Cubic Zirconia)

Carbon (C) or Zirconium Dioxide (ZrO2)

Opalite (Man-made Glass (Synthetic Opalized Glass)) — mineral

Opalite

Man-made Glass (Synthetic Opalized Glass)

Bismuth Crystal (Bismuth (element symbol Bi, atomic number 83)) — mineral

Bismuth Crystal

Bismuth (element symbol Bi, atomic number 83)

Amber (Amber (Fossilized Tree Resin)) — mineral

Amber

Amber (Fossilized Tree Resin)

Coal (Bituminous or Anthracite) (Carbonaceous Sedimentary Rock) — sedimentary

Coal (Bituminous or Anthracite)

Carbonaceous Sedimentary Rock

Ruby (varietal of Corundum) (Corundum (Al2O3:Cr)) — gemstone

Ruby (varietal of Corundum)

Corundum (Al2O3:Cr)

Milky Quartz (Crystalline Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

Spinel (Magnesium Aluminum Oxide (MgAl2O4)) — mineral

Spinel

Magnesium Aluminum Oxide (MgAl2O4)

Ruby (Corundum (Al2O3 with Chromium trace)) — mineral

Ruby

Corundum (Al2O3 with Chromium trace)

Rough Ruby (Corundum (Al2O3 with Chromium impurities)) — mineral

Rough Ruby

Corundum (Al2O3 with Chromium impurities)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Blue Sapphire (Corundum (Al2O3 with Cr, Fe, and Ti trace elements)) — gemstone

Blue Sapphire

Corundum (Al2O3 with Cr, Fe, and Ti trace elements)

Diamond (Faceted Gemstone) (Native Carbon (C)) — mineral

Diamond (Faceted Gemstone)

Native Carbon (C)

Yellow faceted gemstone earrings, likely citrine or yellow beryl (Citrine: quartz, SiO₂; possible yellow beryl: Be₃Al₂Si₆O₁₈) — gemstone

Yellow faceted gemstone earrings, likely citrine or yellow beryl

Citrine: quartz, SiO₂; possible yellow beryl: Be₃Al₂Si₆O₁₈