Emerald
Beryl, Be₃Al₂(SiO₃)₆, colored green mainly by chromium and/or vanadium
gemstone
Category
Mineraloid Like Synthetic Material
Browse mineraloid like synthetic material specimens identified by the Rock Identifier community.
Learn about Mineraloid Like Synthetic Material in the encyclopedia
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Limonite/Ironstone
Limonite (FeO(OH)·nH2O)
mineral
Mahogany Obsidian
Obsidian (volcanic glass with hematite/magnetite inclusions)
igneous
Silicon Carbide (Carborundum)
Silicon Carbide (SiC)
mineral
Obsidian
Volcanic glass (SiO2 - Silicon Dioxide with impurities)
igneous
Anthracite Coal
Anthracite (Carbon-rich mineraloid)
metamorphic
Amber
Succinite (Organic Mineraloid) - C10H16O
mineral
Blue Goldstone
Synthetic Avanturine Glass (or Aventurine Glass)
Synthetic Glass
Tektite (Indochinite)
Tektite (High-silica impact glass)
mineraloid
Corundum (Pink Sapphire / Ruby)
Al2O3 (Aluminum Oxide)
mineral
Diamond (or Diamond Simulant)
Carbon (C)
gemstone
Opalite Egg
Synthetic Glass (Simulated Opal)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Limonite Concretion
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
sedimentary
Shungite
Shungite (carbon-rich Precambrian mineraloid)
mineral
Black Obsidian
Volcanic Glass (SiO2 + MgO / Fe3O4)
igneous
Snowflake Obsidian
Volcanic glass (SiO2) with Cristobalite (SiO2) inclusions
igneous
Opalite crescent pendant
Opalite (man-made opalescent glass; not a natural mineral)
gemstone
Obsidian
Volcanic glass (SiO2 - Silicon Dioxide with impurities)
Igneous
Amber in Matrix
Succinite (Carbon-based organic polymer)
Organic (Sedimentary context)
Aura Quartz
Silicon Dioxide (SiO2) with Titanium/Metal vapor coating
mineral
Cultured Marble (Synthetic)
Polymer-matrix composite (typically calcium carbonate in polyester resin)
Synthetic / Composite Material
Limonite (Iron Ore)
Limonite (an FeO(OH)·nH2O mineraloid, not a true mineral due to variable composition)
Mineral
Blue Sapphire (likely lab-grown or treated)
Corundum (Aluminum Oxide, Al2O3)
gemstone
Amber
Succinite (C10H16O)
Mineraloid (Organic)
Anthracite Coal
Anthracite (Carbon-based organic sedimentary rock transitioned to metamorphic)
metamorphic
Cubic Zirconia (as a jewelry specimen)
Zirconium dioxide (ZrO2)
mineral
Snowflake Obsidian
Volcanic glass (SiO2 - Silicon Dioxide with Cristobalite inclusions)
igneous
Green Opal
Hydrated amorphous silica (SiO2·nH2O) with inclusions
mineraloid
Diamond (or Diamond Simulant)
Carbon (C) if diamond, various if simulant (e.g., Cubic Zirconia - ZrO2, Moissanite - SiC)
gemstone
Precious Opal
Hydrated Silica (SiO2·nH2O)
mineral
Ruby (in costume jewelry context)
Corundum (Al2O3) with Chromium impurities
mineral
Cubic Zirconia (CZ)
Cubic Zirconium Dioxide (ZrO2)
mineral (synthetic)
Amber with Inclusion
Succiniferous fossil resin (C10H16O)
mineraloid
Likely blue glass or synthetic gemstone jewelry
Uncertain; possibly synthetic spinel, cubic zirconia, or blue glass
gemstone
Obsidian
Volcanic glass (high silica volcanic rock)
igneous
Opalite
Synthetic Silicon Dioxide (SiO2)
mineral
Larimar
Pectolite (NaCa2Si3O8(OH))
Mineral variant / Gemstone
Black Obsidian
Volcanic Glass (SiO2 + impurities like Fe3O4)
igneous
Cubic Zirconia (simulant) or Diamond
ZrO2 (Cubic Zirconia) or C (Diamond)
gemstone
Obsidian
Obsidian (Volcanic Glass, SiO2)
igneous
Ruby (Corundum)
Aluminum oxide (Al2O3) with Chromium traces
mineral