Opalite
Synthetic Glass (Simulated Opal)
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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Green aventurine beads
Quartz (SiO₂), typically green quartzite/aventurine with fuchsite mica inclusions
mineral
Green cabochon gemstone pendant, likely turquoise or dyed green turquoise
Probably turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; exact identification requires testing
gemstone
Diamond (or Diamond Simulant)
Carbon (C) if diamond, various if simulant
gemstone
Sandstone (Quartz Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Mystic Topaz
Aluminum Silicate Fluoride Hydroxide (Al2SiO4(F,OH)2) with metallic film coating
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Sedimentary Rock (Quartz Arenite)
sedimentary
Banded Agate (specifically Sardonyx or Carnelian Agate)
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Sandstone (Pebble)
Sandstone
sedimentary
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Asphalt (Road Aggregate)
Bituminous Conglomerate / Asphalt Concrete
Anthropogenic (Man-made)
Heart-shaped Jasper / Chert Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral/gemstone
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2AlSi3O10(OH)2)
mineral
Tumbled tree agate (dendritic agate)
Cryptocrystalline quartz, SiO₂, with manganese/iron-oxide dendrites
mineral
Citrine Geode Fragment
Silicon Dioxide (SiO2) with iron impurities
mineral
Yellow Quartz (Citrine or Iron-Stained Quartz)
Silicon Dioxide (SiO2)
mineral
Amethyst and Citrine (Ametrine Mix)
Silicon Dioxide (SiO2) with Fe3+ impurities
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz (with inclusions)
Silicon Dioxide (SiO2)
mineral
Obsidian
Obsidian (Volcanic Glass, SiO2)
igneous
Quartzite (Quartz Vein)
SiO2 (Silicon Dioxide)
metamorphic
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Citrine Quartz
Macrocrystalline Quartz (SiO2)
mineral
Chert (often colloquially called Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Diamond (or Lab-Grown Cubic Zirconia)
Carbon (C)
mineral
Pink faceted gemstone, likely synthetic ruby or pink sapphire
Corundum (Al₂O₃), possibly chromium-colored ruby; synthetic origin likely
gemstone
Rough Sapphire
Corundum (Al2O3)
mineral
Mahogany Obsidian
Volcanic Glass with Hematite/Magnetite inclusions (SiO2 + Fe2O3)
igneous
Green Aventurine
SiO2 (Silicon Dioxide with Fuchsite inclusions)
mineral
Granite (Dioritic variant)
Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Green Garden Quartz (Phantom Quartz)
Silicon Dioxide (SiO2) with Chlorite inclusions
mineral
Smoky Quartz
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Vesicular Basalt / Scoria pebble
Extrusive igneous rock with amygdaloidal infilling
igneous
Chert / Flint
Silicon dioxide (Microcrystalline Quartz, $SiO_2$)
sedimentary
Sandstone
Arenite
sedimentary
Weathered granite-like rock
Granite, likely biotite-bearing; exact identification is uncertain from the image
igneous
Blue Topaz (facetted in jewelry)
Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)
mineral
Goldstone (Brown/Gold)
Aventurine Glass (Man-made glass with Copper inclusions)
gemstone
Diamond (Set in jewelry)
Cubic Carbon (C)
mineral
Yellow Quartz (possibly dyed)
Silicon Dioxide (SiO2)
mineral