Chert (varietal: Flint/Jasper)
Silicon Dioxide (SiO2)
sedimentary
Category
Man Made Silicate (Anthropogenic Glass)
Browse man made silicate (anthropogenic glass) specimens identified by the Rock Identifier community.
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Chert (Chert / Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Orthoclase (Potassium) Feldspar in Quartz
KAlSi3O8 (Potassium Aluminum Silicate)
igneous
Chert (Green)
Silicon Dioxide (SiO2)
sedimentary
Tektite
Natural impact glass
meteorite
Weathered quartz-rich pebble
Likely granitic or feldspathic clast; chiefly quartz (SiO₂) and feldspar
igneous
Aquamarine (Beryl)
Beryllium Aluminum Silicate - Be3Al2Si6O18
gemstone
Beryl (Emerald or Aquamarine in Matrix)
Beryllium Aluminum Silicate (Be3Al2Si6O18)
mineral
Smoky quartz fragment
Quartz, silicon dioxide (SiO₂), smoky variety
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Peach Moonstone (Orange/Peach Feldspar)
Potassium aluminum silicate (KAlSi3O8)
mineral
Yellow faceted gemstone, likely citrine or synthetic glass
Citrine (quartz, SiO₂) is the leading natural possibility; visual identification is uncertain from the photograph
gemstone
Milky quartz pebble
Quartz (silicon dioxide, SiO₂)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Orthoclase Feldspar
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Sandstone (likely Quartzose Sandstone)
Arenite
sedimentary
Orthoclase Feldspar (Sunstone variety)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Red Jasper
Jasper (Silicate Mineral - SiO2)
sedimentary
Rounded quartz-rich pebble, possibly weathered granite or quartzite
Indeterminate; likely quartz (SiO₂)-rich silicate rock
igneous or metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2, often with CaCO3 or Fe2O3 cement)
sedimentary
Engraved purple stone cabochon, possibly amethyst
Unconfirmed; if amethyst, quartz (SiO₂)
gemstone
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Polished/tumbled brown-and-white mineral fragment
Indeterminate; possibly quartz-rich jasper, brecciated jasper, or an iron-stained quartz mineral
mineral
Snowflake Obsidian
Volcanic glass with Cristobalite inclusions (70–75% SiO2)
igneous
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Metamorphosed Quartz Sandstone
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary
Feldspar (Potassium Feldspar / Orthoclase)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Potassium Feldspar (Orthoclase / Microcline)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Obsidian
Volcanic Glass (SiO2)
igneous
Quartzite
Metamorphic Rock (Mainly SiO2)
metamorphic
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Black-and-white agate geode pendant
Agate (microcrystalline quartz, SiO₂), likely a hollow geode slice with chalcedony and drusy quartz
mineral
Chert (Yellow Jasper/Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (Quartzose)
Sandstone (SiO2 dominated)
sedimentary
Polished amethyst-bearing quartz
Quartz, SiO₂; purple coloration from irradiation and trace iron
mineral
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary