Ruby
Corundum (Al2O3 with Chromium impurities)
mineral
Category
Mineraloid (Man Made Origin)
Browse mineraloid (man made origin) specimens identified by the Rock Identifier community.
Learn about Mineraloid (Man Made Origin) in the encyclopedia
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Emerald In Matrix
Beryl (Be3Al2Si6O18) with trace Chromium/Vanadium
mineral
Diamond (in a gold ring)
Diamond (pure carbon, C)
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Man-made Green Quartz (Lab-grown or Treated)
Silicon Dioxide (SiO2) with artificial coloration
mineral
Fulgurite
Fulgurite (Lechatelierite)
metamorphic
Black Obsidian
Volcanic Glass (SiO2 + impurities)
Igneous
Piddock-bored Mudstone
Lutite (Siltstone or Mudstone) with Pholad borings
sedimentary
Fossiliferous Limestone (Coral Rag)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Fluorite (Fluorescent)
Calcium Fluoride (CaF2)
mineral
Obsidian
Volcanic glass (SiO2 - Silicon Dioxide with impurities)
igneous
Limonite (Iron Ore)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Pearl
Calcium Carbonate (primarily Aragonite and Calcite), CaCO3
mineral
Build-A-Bear Plush (Non-Geological)
Polyester fibers (C10H8O4)n and Synthetic Polymers
Anthropogenic / Non-mineral
Granite
Phaneritic intrusive igneous rock
igneous
Peridot (Gem-quality Olivine)
Magnesium Iron Silicate ((Mg, Fe)2SiO4)
mineral
Obsidian
Volcanic Glass (SiO2 rich)
igneous
Fulgurite
Fulgurite (Lechatelierite-rich fused silica)
mineraloid / sedimentary (secondary formation)
Anthracite Coal
Anthracite (Carbon-rich mineraloid)
metamorphic
Amber
Succinite (Organic Mineraloid) - C10H16O
mineral
Diamond (in jewelry setting)
Diamond (C - Carbon)
mineral
Diamond (in a jewelry setting)
Diamond (Carbon, C)
mineral
Breccia
Clastic Breccia (General mineral composition depends on fragments, often SiO2 or CaCO3)
sedimentary
Sandstone with Concretions / Liesegang Rings
Arenite with iron oxide banding
sedimentary
Green Aventurine
Quartz (SiO2) with Fuchsite inclusions
Mineral
Jasper (Red/Brown)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Rough Diamond
Diamond (C)
mineral
Cone-in-cone structure
Cone-in-cone structure
sedimentary
Quartz (Milky/Iron-stained)
Silicon Dioxide (SiO2)
mineral
Obsidian
Volcanic glass
igneous
Limonite (Ironstone)
Limonite (mixture of hydrated iron oxides, primarily Goethite α-FeO(OH))
mineral
White Opal
Hydrated Silica (SiO2·nH2O)
mineral
Obsidian
Volcanic glass (SiO2 - Silicon Dioxide with impurities)
igneous
Stromatolite
Laminated biogenic sedimentary structure (formed by Cyanobacteria)
sedimentary
Granodiorite
Granodiorite
Igneous
Quartz (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Banded Jasper with Hematite or Quartz
Silicon Dioxide (SiO2) with impurities
sedimentary
Limestone (specifically Marl or Chalk)
Calcium Carbonate (CaCO3)
sedimentary
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Malaysian 50 Sen Coin
Coinage (specific alloy unknown without metallurgical analysis, but typically brass or bronze for this denomination and era)
Man-made object (coin)
Abalone Shell (Nacre)
Aragonite (CaCO3) - Biogenic Mineral
mineral