Diamond (or high-quality simulant like Cubic Zirconia)
Carbon (C) - Native Element
mineral
Category
Mineral Like (Natural Glass)
Browse mineral like (natural glass) specimens identified by the Rock Identifier community.
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Sandstone (with Iron Staining)
Clastic sedimentary rock (SiO2 with Fe2O3 oxides)
sedimentary
Green Glass Slag
Amorphous Silicon Dioxide (SiO2) with metal oxide impurities
mineraloid (man-made)
Yellow Quartz (Citrine or Quartzite Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz (Smoky Quartz variant)
Silicon Dioxide (SiO2)
mineral
Sandstone (Pebble)
Arenite (primarily SiO2)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO₂)
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Arkosic or Lithic Sandstone)
Clastic Sedimentary Rock (SiO2 with assorted minerals)
sedimentary
Amethyst (Agate/Chalcedony variety)
Silicon Dioxide (SiO2) with iron impurities
mineral
Rutilated Quartz
Quartz (SiO2) with Rutile inclusions (TiO2)
Mineral
Yellow Quartz (Citrine Quartzite)
Silicon Dioxide (SiO2)
metamorphic
Diamond (or Diamond Simulant)
Carbon (C)
mineral
Petrified Wood
Silicified Wood (SiO2 permineralization)
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions (K(Al,Cr)2AlSi3O10(OH)2)
mineral
Dyed Pink Quartzite (Jadeite Simulant)
Silicon Dioxide (SiO2) with organic dye
metamorphic
Diamond (in a jewelry setting)
Diamond (Carbon, C)
mineral
Zirconia (Ceramic) & Ion-X Glass
Zirconium Dioxide (ZrO2) and Ion-strengthened Aluminosilicate Glass
Synthetic Mineral / Glass
Jasper in Quartz (River Cobble)
Silicon Dioxide (SiO2) with Ferric Iron inclusions
sedimentary
Green Aventurine
Aventurine Quartz (SiO2 + Muscovite/Fuchsite)
metamorphic
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Precious Red Coral
Corallium rubrum / Corallium japonicum
mineral (organic gemstone)
Dyed Blue Agate (Dragon Vein Agate)
Silicon Dioxide (SiO2) with artificial cobalt/organic dyes
mineral
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
mineral
Obsidian
Obsidian (volcanic glass), predominantly amorphous SiO₂
Igneous
Sandstone (Quartz-rich)
Arenite (primarily SiO2)
sedimentary
Cubic Zirconia (as a jewelry specimen)
Zirconium dioxide (ZrO2)
mineral
Smoky Quartz (with possible Garnet inclusions)
Silicon Dioxide (SiO2)
mineral
Turquoise (Blue Howlite / Magnesite imitation)
CuAl6(PO4)4(OH)8·4H2O (for natural Turquoise); Ca2B5SiO9(OH)5 (for Howlite)
mineral
Sandstone (River Cobble)
Sandstone (primarily composed of silica, SiO2)
sedimentary
Ruby (Raw Corundum)
Corundum (Al2O3:Cr)
mineral
Ferruginous Quartz (Hematoid Quartz)
Silicon Dioxide (SiO2) with Hematite or Goethite inclusions
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Rough Corundum (Sapphire/Ruby mixture)
Corundum (Aluminum Oxide, Al2O3)
mineral
Man-made Jewelry Charm (Enameled Metal)
Not a natural mineral; composed of base metal alloy (likely zinc or brass) and epoxy resin/enamel.
Synthetic / Manufactured Artifact
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (specifically Banded Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Quartz (Smoky/Milky Pebble)
Silicon Dioxide (SiO2)
mineral