Chert (Black Chert/Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Category
Synthetic (Ceramic)
Browse synthetic (ceramic) specimens identified by the Rock Identifier community.
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Milky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz on Feldspar (Granite Pegmatite)
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)
igneous
Limonite or Ironstone Nodule
Hydrated iron oxide-hydroxide (FeO(OH)·nH2O)
mineral
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Flint (Chert)
Cryptocrystalline Quartz (SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Chert (Flint)
Cryptocrystalline Silica (SiO2)
sedimentary
Quartzite
Quartzite (chiefly SiO2)
metamorphic
Celestine (Celestite)
Strontium Sulfate (SrSO4)
mineral
Kaolinite (Chalky Clay)
Kaolinite (Al2Si2O5(OH)4)
sedimentary
Kyanite in Quartz
Al2SiO5 in SiO2
metamorphic
Quartz with Orthoclase Feldspar
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)
mineral
White quartz pebble
Quartz (silicon dioxide, SiO₂), likely milky quartz
mineral
Flint
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Claystone / Mudstone
Mudstone (Hydrous aluminum silicate rich rock)
sedimentary
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chert / Flint
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Pegmatite (Feldspar and Quartz)
Pegmatite (KAlSi3O8 / SiO2)
igneous
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (often called Flint when dark)
Microcrystalline silicon dioxide (SiO2)
sedimentary
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
Mineral
Quartzite
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Iolite (Cordierite)
Cordierite (Magnesium Aluminum Silicate), Mg2Al4Si5O18
mineral
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Orthoclase Feldspar
Potassium aluminum silicate (KAlSi3O8)
mineral
Potassium Feldspar
K-Feldspar (KAlSi3O8)
mineral
Dumortierite Quartz
Dumortierite (Al7BCuO15)
metamorphic
Chert / Flint Nodules
Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz Pebble (Chert/Chalcedony variety)
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chert (White Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Pegmatitic Granite
Granite with Orthoclase Feldspar and Quartz (SiO2, KAlSi3O8)
igneous
Quartzite Pebble
Recrystallized Quartz (SiO2)
metamorphic
Quartz-rich rock, possibly milky quartz or quartzite fragment
Quartz (SiO₂), potentially quartzite if metamorphic
mineral
K-Feldspar (Potassium Feldspar)
Potassium Feldspar (KAlSi3O8)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Milky quartz
Quartz (SiO₂), commonly massive or vein quartz
mineral