Ruby (or potential synthetic/imitation)
Corundum (Al2O3)
gemstone
Category
Mineral Like (Natural Glass)
Browse mineral like (natural glass) specimens identified by the Rock Identifier community.
Learn about Mineral Like (Natural Glass) in the encyclopedia
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Clear Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Green Aventurine
Aventurine Quartz (SiO2 with inclusions of Fuchsite)
metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary
Goldstone and Aura Quartz
Cuprous Glass (Goldstone) and Titanium-coated SiO2 (Aura Quartz)
Mineral/Glass Specimen
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Smoky Quartz)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2) with natural radiation induced color centers
mineral
Strawberry Quartz (Red Aventurine)
Silicon Dioxide (SiO2) with Hematite/Goethite inclusions
mineral
Strawberry Quartz
Silicon Dioxide (SiO2) with Hematite/Goethite inclusions
mineral
Quartz (Water-worn pebble)
Silicon Dioxide (SiO2)
mineral
Opalite (Synthetic Moonstone/Sea Opal)
Silicon Dioxide (SiO2) glass with metallic inclusions
Synthetic/Man-made Glass
Amethyst (Quartz Cluster)
Silicon Dioxide (SiO2) with iron impurities
mineral
Rough Corundum (likely Sapphire/Zircon-bearing)
Aluminium Oxide (Al2O3)
mineral
Red aventurine
Silicon Dioxide (SiO2) with Hematite/Goethite inclusions
metamorphic
Smoky Quartz
Silicon dioxide with aluminum impurities (SiO2)
mineral
Chalcedony (Smoky Quartz or Agate nodule fragment)
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartzose)
Arenite (SiO2 principal)
sedimentary
Dyed Agate
Silicon Dioxide (SiO2) with artificial pigment
sedimentary
Citrine
Silicon Dioxide (SiO2) with iron impurities
Mineral
Yellow Quartz / Chalcedony
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon dioxide (SiO2)
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Amethyst
Silicon Dioxide with iron impurities (SiO2)
mineral
Amethyst (Chevron or Banded Amethyst)
Silicon Dioxide (SiO2 with iron impurities)
Mineral
Blue Goldstone
Synthetic Avanturine Glass (or Aventurine Glass)
Synthetic Glass
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Sandstone
Arenite (lithic or quartz sandstone)
sedimentary
Sandstone with Iron Staining
Arenite with Limonite/Hematite inclusions (SiO2 + Fe2O3/FeO(OH))
sedimentary
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Quartz (Citrine variety)
Silicon Dioxide (SiO2)
mineral
Citrine Quartz Cluster
Silicon Dioxide (SiO2)
mineral
Tumbled amber-colored chalcedony or jasper
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper
mineral
Citrine
Citrine (Silicon Dioxide, SiO2)
mineral
Sandstone (Arkose/Quartzose)
Arenite (SiO2 based clastic rock)
sedimentary
Sandstone (Micaceous)
Arenite (composed primarily of SiO2)
sedimentary
Green Quartz (Prasiolite variant or Aventurine)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Smoky Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary