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

Opalite (Synthetic opalescent glass) — glass

Opalite

Synthetic opalescent glass

Asphalt / Road Aggregate (Bituminous Conglomerate (synthetic)) — sedimentary

Asphalt / Road Aggregate

Bituminous Conglomerate (synthetic)

Opalite (Synthetic Opalized Glass) — mineraloid (man-made)

Opalite

Synthetic Opalized Glass

mineraloid (man-made)

Rainbow Hematite / Magnetic Hematite (Iron oxide (Fe2O3) - often synthetic/coated for beads) — mineral

Rainbow Hematite / Magnetic Hematite

Iron oxide (Fe2O3) - often synthetic/coated for beads

Amber (Succinates (Organic Fossilized Resin)) — mineral

Amber

Succinates (Organic Fossilized Resin)

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

Diamond (or Cubic Zirconia)

Cubic Carbon (C) or Zirconium Dioxide (ZrO2)

Red gemstone, likely ruby (Corundum (Al₂O₃), colored red by chromium; identity cannot be confirmed from the photo) — gemstone

Red gemstone, likely ruby

Corundum (Al₂O₃), colored red by chromium; identity cannot be confirmed from the photo

Star sapphire ring (Corundum (Al₂O₃), likely asteriated sapphire) — gemstone

Star sapphire ring

Corundum (Al₂O₃), likely asteriated sapphire

Amber (Succinite (a fossilized organic resin containing succinic acid)) — mineraloid

Amber

Succinite (a fossilized organic resin containing succinic acid)

Ruby (set in a ring; possibly synthetic or imitation) (Corundum, Al₂O₃; red color is typically caused by chromium) — gemstone

Ruby (set in a ring; possibly synthetic or imitation)

Corundum, Al₂O₃; red color is typically caused by chromium

Faceted red gemstone, likely ruby (Corundum (Al₂O₃), red variety colored mainly by chromium) — gemstone

Faceted red gemstone, likely ruby

Corundum (Al₂O₃), red variety colored mainly by chromium

Green Fluorite (likely synthetic or heat-treated for jewelry) (Calcium Fluoride (CaF2)) — mineral

Green Fluorite (likely synthetic or heat-treated for jewelry)

Calcium Fluoride (CaF2)

Red gemstone ring (likely synthetic ruby or red glass) (Possibly corundum (Al₂O₃), chromium-colored; identity cannot be confirmed from the image) — gemstone

Red gemstone ring (likely synthetic ruby or red glass)

Possibly corundum (Al₂O₃), chromium-colored; identity cannot be confirmed from the image

Amber (Succinite) — mineral

Amber

Succinite

Faceted Clear Gemstone (Likely Quartz or Cubic Zirconia) (Silicon Dioxide (SiO2) or Zirconium Dioxide (ZrO2)) — gemstone

Faceted Clear Gemstone (Likely Quartz or Cubic Zirconia)

Silicon Dioxide (SiO2) or Zirconium Dioxide (ZrO2)

Amber (Succinite (Fossilized Tree Resin), C10H16O) — Organic Mineraloid

Amber

Succinite (Fossilized Tree Resin), C10H16O

Organic Mineraloid

Opalite (Synthetic Opalized Glass) — gemstone

Opalite

Synthetic Opalized Glass

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

Opalite

Synthetic Opalite Glass

mineraloid (man-made)

Opalite (Synthetic Opalised Glass) — Mineral (Synthetic / Man-made)

Opalite

Synthetic Opalised Glass

Mineral (Synthetic / Man-made)

Opalite (Synthetic Moonstone/Opal) (Synthetic Silica Glass) — mineraloid (synthetic)

Opalite (Synthetic Moonstone/Opal)

Synthetic Silica Glass

mineraloid (synthetic)

Opalite (Synthetic Opalised Glass) — mineral

Opalite

Synthetic Opalised Glass

Opalite (Synthetic Opalised Glass) — mineraloid (synthetic)

Opalite

Synthetic Opalised Glass

mineraloid (synthetic)

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

Opalite (Man-made Glass)

Synthetic Opalised Glass

Jet (Lignite coal variant (hydrocarbon polymer)) — sedimentary

Jet

Lignite coal variant (hydrocarbon polymer)

Engineered Quartz Stone (Agglomerated Quartz (SiO2 + Polymer Resin)) — mineral-based composite

Engineered Quartz Stone

Agglomerated Quartz (SiO2 + Polymer Resin)

mineral-based composite

Quartz (Engineered Stone Countertop) (Silicon Dioxide (SiO2) with polymer resins) — Sedimentary-like (Industrial Composite)

Quartz (Engineered Stone Countertop)

Silicon Dioxide (SiO2) with polymer resins

Sedimentary-like (Industrial Composite)

Faceted Quartz or Cubic Zirconia (SiO2 (Quartz) or ZrO2 (Cubic Zirconia)) — gemstone

Faceted Quartz or Cubic Zirconia

SiO2 (Quartz) or ZrO2 (Cubic Zirconia)

Cardstock (Paper) (Cellulose (C6H10O5)n) — sedimentary (man-made)

Cardstock (Paper)

Cellulose (C6H10O5)n

sedimentary (man-made)

Amber (Fossilized Tree Resin (Organic Polymer)) — gemstone

Amber

Fossilized Tree Resin (Organic Polymer)

Amber in Matrix (Succinite (Carbon-based organic polymer)) — Organic (Sedimentary context)

Amber in Matrix

Succinite (Carbon-based organic polymer)

Organic (Sedimentary context)

Amber (Succinicum (Organic polymer, largely C10H16O)) — Organic Mineral

Amber

Succinicum (Organic polymer, largely C10H16O)

Organic Mineral

Faceted Clear Quartz or Diamond Simulant (Silicon Dioxide (SiO2) if Quartz or Cubic Zirconia (ZrO2) if Synthetic) — gemstone

Faceted Clear Quartz or Diamond Simulant

Silicon Dioxide (SiO2) if Quartz or Cubic Zirconia (ZrO2) if Synthetic

Clear Quartz (Faceted) or Cubic Zirconia / Glass imitation (SiO2 (if Quartz), ZrO2 (if Cubic Zirconia)) — mineral

Clear Quartz (Faceted) or Cubic Zirconia / Glass imitation

SiO2 (if Quartz), ZrO2 (if Cubic Zirconia)

Opalite (Synthetic glass (SiO2 + impurities)) — mineral

Opalite

Synthetic glass (SiO2 + impurities)

Red gemstone, likely ruby (Corundum (Al₂O₃), colored red by chromium) — gemstone

Red gemstone, likely ruby

Corundum (Al₂O₃), colored red by chromium

Beaded gemstone bracelets, likely lavender jade/quartz and blue-gray sodalite or dumortierite (Probable jadeite/nephrite or lavender quartz; blue beads may be sodalite (Na8(Al6Si6O24)Cl2) or dumortierite) — mineral

Beaded gemstone bracelets, likely lavender jade/quartz and blue-gray sodalite or dumortierite

Probable jadeite/nephrite or lavender quartz; blue beads may be sodalite (Na8(Al6Si6O24)Cl2) or dumortierite

Red faceted gemstone, likely synthetic ruby (Corundum (Al₂O₃); ruby when red, possibly laboratory-grown) — gemstone

Red faceted gemstone, likely synthetic ruby

Corundum (Al₂O₃); ruby when red, possibly laboratory-grown

Gemstone ring (stones not identifiable from image) (Unknown; the ring appears to contain two yellow stones and one colorless stone, possibly faceted gemstones or simulants) — gemstone

Gemstone ring (stones not identifiable from image)

Unknown; the ring appears to contain two yellow stones and one colorless stone, possibly faceted gemstones or simulants

Blue cabochon gemstone ring (Uncertain; likely blue sapphire (corundum, Al₂O₃), blue topaz, or synthetic glass/spinel) — gemstone

Blue cabochon gemstone ring

Uncertain; likely blue sapphire (corundum, Al₂O₃), blue topaz, or synthetic glass/spinel

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

Rock Crystal (Clear Quartz)

Silicon dioxide (SiO2)

Gemstone rings (stones not reliably identifiable) (The pale stone may be quartz or another translucent gem; the red stone may be ruby, garnet, or synthetic corundum. Image detail is insufficient for identification.) — gemstone

Gemstone rings (stones not reliably identifiable)

The pale stone may be quartz or another translucent gem; the red stone may be ruby, garnet, or synthetic corundum. Image detail is insufficient for identification.

Red gemstone ring, likely ruby or synthetic ruby (Corundum (Al₂O₃), chromium-colored; the image alone cannot confirm whether it is natural or synthetic) — gemstone

Red gemstone ring, likely ruby or synthetic ruby

Corundum (Al₂O₃), chromium-colored; the image alone cannot confirm whether it is natural or synthetic