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 Goldstone (Aventurine Glass) — Man-made glass (often grouped with minerals in lapidary)

Blue Goldstone

Aventurine Glass

Man-made glass (often grouped with minerals in lapidary)

Dyed Quartz Pendant (Silicon Dioxide (SiO2) with artificial dye) — mineral

Dyed Quartz Pendant

Silicon Dioxide (SiO2) with artificial dye

Tumbled amber (Amber (fossilized plant resin), chiefly polymerized diterpenoid resin) — gemstone

Tumbled amber

Amber (fossilized plant resin), chiefly polymerized diterpenoid resin

Amber (Fossilized tree resin (predominantly cross-linked terpenoid polymers)) — gemstone

Amber

Fossilized tree resin (predominantly cross-linked terpenoid polymers)

Tumbled amber-like material (Amber (fossilized tree resin; chiefly polymerized diterpenoid resin)) — gemstone

Tumbled amber-like material

Amber (fossilized tree resin; chiefly polymerized diterpenoid resin)

Diamond ring (Diamond, crystalline carbon (C), likely a faceted mounted stone) — gemstone

Diamond ring

Diamond, crystalline carbon (C), likely a faceted mounted stone

Opal cabochon (Hydrated amorphous silica, SiO₂·nH₂O; likely common or synthetic opal) — gemstone

Opal cabochon

Hydrated amorphous silica, SiO₂·nH₂O; likely common or synthetic opal

Ruby in matrix (likely ruby-bearing corundum) (Corundum, aluminum oxide (Al₂O₃), chromium-bearing variety) — gemstone

Ruby in matrix (likely ruby-bearing corundum)

Corundum, aluminum oxide (Al₂O₃), chromium-bearing variety

Ruby cabochons (Corundum, aluminum oxide (Al₂O₃), colored red by chiefly chromium) — gemstone

Ruby cabochons

Corundum, aluminum oxide (Al₂O₃), colored red by chiefly chromium

Blue Sapphire (Corundum (Al2O3)) — mineral

Blue Sapphire

Corundum (Al2O3)

Pink Sapphire (Corundum (Al2O3 with trace Chromium and Iron)) — mineral

Pink Sapphire

Corundum (Al2O3 with trace Chromium and Iron)

Ruby (Corundum) (Corundum (Aluminum Oxide) with chromium trace elements, Al2O3) — mineral

Ruby (Corundum)

Corundum (Aluminum Oxide) with chromium trace elements, Al2O3

Ruby (Corundum (Aluminium Oxide with Chromium impurities, Al2O3:Cr)) — mineral

Ruby

Corundum (Aluminium Oxide with Chromium impurities, Al2O3:Cr)

Clear Quartz (Rock Crystal) (Silicon Dioxide (SiO2)) — mineral

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Cubic Zirconia (Zirconium Dioxide (ZrO2)) — mineral

Cubic Zirconia

Zirconium Dioxide (ZrO2)

Blue Sapphire (Corundum (Al2O3) with traces of Iron and Titanium) — mineral

Blue Sapphire

Corundum (Al2O3) with traces of Iron and Titanium

Clear faceted gemstone, likely quartz (rock crystal) (Quartz, silicon dioxide (SiO₂); visual identification is uncertain because the stone is heavily faceted and photographed with flash) — gemstone

Clear faceted gemstone, likely quartz (rock crystal)

Quartz, silicon dioxide (SiO₂); visual identification is uncertain because the stone is heavily faceted and photographed with flash

Green cabochon gemstone, likely glass-filled or synthetic emerald imitation (Uncertain; possible synthetic emerald (beryl, Be₃Al₂Si₆O₁₈) or green glass) — gemstone

Green cabochon gemstone, likely glass-filled or synthetic emerald imitation

Uncertain; possible synthetic emerald (beryl, Be₃Al₂Si₆O₁₈) or green glass

Diamond (or Diamond Simulant) (Native Carbon (C)) — gemstone

Diamond (or Diamond Simulant)

Native Carbon (C)

Opal (in Jewelry Setting) (Hydrated Silicon Dioxide (SiO2·nH2O)) — gemstone

Opal (in Jewelry Setting)

Hydrated Silicon Dioxide (SiO2·nH2O)

Diamond (Pure Carbon (C)) — mineral

Diamond

Pure Carbon (C)

Amber (Fossilized Tree Resin (Generic formula roughly C10H16O)) — mineral

Amber

Fossilized Tree Resin (Generic formula roughly C10H16O)

Amber with Inclusion (Succiniferous fossil resin (C10H16O)) — mineraloid

Amber with Inclusion

Succiniferous fossil resin (C10H16O)

Polished amber (Amber (fossilized plant resin; commonly succinite, not a mineral)) — gemstone

Polished amber

Amber (fossilized plant resin; commonly succinite, not a mineral)

Tumbled amber (Amber (fossilized plant resin; commonly succinite, C₁₀H₁₆O)) — fossil

Tumbled amber

Amber (fossilized plant resin; commonly succinite, C₁₀H₁₆O)

Cubic Zirconia (Simulated Diamond) (Zirconium Dioxide (ZrO2)) — mineral (synthetic)

Cubic Zirconia (Simulated Diamond)

Zirconium Dioxide (ZrO2)

mineral (synthetic)

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

Hematite

Iron(III) oxide (Fe2O3)

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

Hematite

Iron(III) oxide (Fe2O3)

Lapis Lazuli (Lapis Lazuli (Complex aggregate including Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)) — metamorphic

Lapis Lazuli

Lapis Lazuli (Complex aggregate including Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Iridescent opal-like specimen (Likely common opal (hydrated amorphous silica, SiO₂·nH₂O), possibly treated or synthetic) — gemstone

Iridescent opal-like specimen

Likely common opal (hydrated amorphous silica, SiO₂·nH₂O), possibly treated or synthetic

White Sapphire (Corundum (Al2O3)) — mineral

White Sapphire

Corundum (Al2O3)

Opalite (a synthetic glass, often confused with Opal) (Silicon dioxide glass (SiO2nH2O, for natural opal)) — Synthetic (glass)

Opalite (a synthetic glass, often confused with Opal)

Silicon dioxide glass (SiO2nH2O, for natural opal)

Synthetic (glass)

Bismuth (Bismuth (Bi)) — Mineral

Bismuth

Bismuth (Bi)

Polished pink quartz cabochon (Quartz (SiO₂), likely rose quartz or included quartz) — gemstone

Polished pink quartz cabochon

Quartz (SiO₂), likely rose quartz or included quartz

Strawberry Quartz (or Rose Quartz / Cherry Quartz) (Silicon Dioxide (SiO2) with Lepidocrocite, Hematite, or Goethite inclusions) — mineral

Strawberry Quartz (or Rose Quartz / Cherry Quartz)

Silicon Dioxide (SiO2) with Lepidocrocite, Hematite, or Goethite inclusions

Dyed Blue Agate (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — mineral

Dyed Blue Agate

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Polished green-and-black banded cabochon (likely malachite imitation or dyed agate) (Uncertain; possible malachite (Cu₂CO₃(OH)₂), banded agate (SiO₂), or man-made glass) — gemstone

Polished green-and-black banded cabochon (likely malachite imitation or dyed agate)

Uncertain; possible malachite (Cu₂CO₃(OH)₂), banded agate (SiO₂), or man-made glass

Polished Baltic amber with insect inclusion (Amber (fossilized plant resin), chiefly polymerized diterpenoid resin; likely succinite) — gemstone

Polished Baltic amber with insect inclusion

Amber (fossilized plant resin), chiefly polymerized diterpenoid resin; likely succinite

Amber (Succinite (C10H16O)) — gemstone

Amber

Succinite (C10H16O)

Tumbled amber (Amber (fossilized plant resin; commonly succinite, C10H16O)) — gemstone

Tumbled amber

Amber (fossilized plant resin; commonly succinite, C10H16O)

Faceted clear gemstone, likely quartz (rock crystal) (Quartz, silicon dioxide (SiO₂); exact identity is uncertain because the strong flash and cut obscure diagnostic features) — gemstone

Faceted clear gemstone, likely quartz (rock crystal)

Quartz, silicon dioxide (SiO₂); exact identity is uncertain because the strong flash and cut obscure diagnostic features

Amber (Fossilized tree resin; chiefly organic terpenoid resin (not a mineral)) — gemstone

Amber

Fossilized tree resin; chiefly organic terpenoid resin (not a mineral)