Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
metamorphic
Category
Mineral (Man Made Glass, Not Natural)
Browse mineral (man made glass, not natural) specimens identified by the Rock Identifier community.
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Yellow Quartz (Citrinated Quartz)
Silicon Dioxide (SiO2)
mineral
Iron-stained quartz-rich rock, possibly jasper or chert
Microcrystalline quartz (SiO₂) with iron oxides/hydroxides
mineral
Chert (with Limestone matrix)
Silicon dioxide (SiO2)
sedimentary
Sandstone (with vugs or solution cavities)
Arenite (primarily Quartz and Feldspar with CaCO3 or SiO2 cement)
sedimentary
Flint
Silicon dioxide (SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Coral Rock (Coquina)
Biogenic Limestone (Calcium Carbonate - CaCO3)
sedimentary
Quartz (Microcrystalline/Chert)
Silicon Dioxide (SiO2)
mineral
Smoky quartz (likely)
Quartz, silicon dioxide (SiO₂), naturally irradiated variety
mineral
Pink/red faceted gemstone, likely synthetic ruby or pink sapphire
Corundum, aluminum oxide (Al₂O₃); likely lab-grown or treated material
gemstone
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (Pebble)
Sandstone (SiO2 with matrix/cement)
sedimentary
Tektite (Indochinite)
Tektite (Natural silica glass)
meteorite
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Smoky/Brown variety)
Silicon dioxide (SiO2)
mineral
Raw Citrine
Citrine (Silicon Dioxide, SiO2)
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (mostly SiO2)
sedimentary
Snowflake Obsidian
Volcanic Glass with Cristobalite inclusions (SiO2)
igneous
Faceted Gemstone
Unknown transparent mineral, possibly Diamond (C), Cubic Zirconia (ZrO2), Quartz (SiO2), or Glass
gemstone
Snowflake obsidian cabochon
Obsidian (volcanic glass), SiO₂-rich; white areas are cristobalite/spherulitic devitrification
igneous
Sandstone
Arenite (SiO2 composition dominant)
sedimentary
Citrine (likely Heat-Treated)
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Citrine or Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 based clastic rock)
sedimentary
Yellow Quartz Pebble (Citrine or Iron-Stained Quartz)
Silicon Dioxide (SiO2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Quartz (Smoky Quartz variant)
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartz Arenite)
Sandstone (dominated by SiO2 quartz grains)
sedimentary
Green Fluorite (likely synthetic or heat-treated for jewelry)
Calcium Fluoride (CaF2)
mineral
Chert (often called Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Moldavite
Tektite (Natural Silica Glass)
meteorite
Chert (specifically Tan/Gray Chert)
Microcrystalline quartz (SiO2)
sedimentary
Citrine
Citrine (Silicon Dioxide - SiO2)
mineral
Sandstone
Arenite (specifically sublithic or quartz arenite)
sedimentary
Sandstone
Arenite (SiO2 based typically)
sedimentary
Amethyst
Amethyst (Silicon Dioxide - SiO2 with Iron impurities)
mineral
Green Aventurine
Quartz containing Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Snowflake Obsidian
Volcanic Glass (SiO2 rich with Cristobalite inclusions)
igneous