Pumice
Pumice (a highly vesicular amorphous silicate glass)
igneous
Category
Man Made Silicate (Anthropogenic Glass)
Browse man made silicate (anthropogenic glass) specimens identified by the Rock Identifier community.
Learn about Man Made Silicate (Anthropogenic Glass) in the encyclopedia
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Milky Quartz
Silicon Dioxide (SiO2)
mineral
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Speckled rounded stone, likely granite or granitic gneiss
Granite/granitic gneiss; primarily quartz (SiO₂), feldspar, and dark mica or amphibole
igneous
Chert (Flint)
SiO2 (Microcrystalline Quartz)
sedimentary
Chert (often called Flint in archaeological contexts)
Silicon Dioxide (SiO2)
sedimentary
Red Jasper with Quartz
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Tumbled Green Jasper
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Iron-stained quartz-rich rock, possibly jasper or chert
Microcrystalline quartz (SiO₂) with iron oxides/hydroxides
mineral
Chert Pebble (Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Chert (specifically Flint or Nodular Chert)
Silicon dioxide (SiO2)
sedimentary
Strawberry Quartz (or Pink Aventurine)
Quartz with Hematite/Goethite inclusions (SiO2)
mineral
Quartzite
Quartzite (Primary mineral: SiO2)
metamorphic
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Common Green Opal
Hydrated amorphous silicon dioxide (SiO2·nH2O)
mineral
Chert (Flinty variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Green Jasper)
Microcrystalline Quartz (SiO2) with iron silicate inclusions
sedimentary
Green Aventurine
SiO2 (Quartz with Fuchsite inclusions)
mineral
Chert (with Limestone matrix)
Silicon dioxide (SiO2)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Red Quartzite
Quartzite (SiO2)
metamorphic
Blue Quartz (Aventurine)
Silicon Dioxide (SiO2) with inclusions of Dumortierite or Magnesio-riebeckite
mineral
African Turquoise (Jasper)
Silicon Dioxide (SiO2) - Macro-crystalline Quartz with inclusions
sedimentary
Snowflake Obsidian
Vitreous volcanic silicate (SiO2 with Cristobalite inclusions)
Igneous
Chert (Yellow Jasper/Flint pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Likely weathered gray stone or chert fragment
Uncertain; possibly microcrystalline quartz (SiO₂)-rich chert
sedimentary
Marble
Recrystallized Carbonate Rock (CaCO3)
metamorphic
Sandstone
Arenite
sedimentary
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Granitoid (Granite/Gneiss)
Granitoid silicate rock, primarily quartz and feldspar
igneous/metamorphic
Chert (specifically Green Chert/Jasper)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Rose Quartz Sphere
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Aquamarine
Beryl (Be3Al2Si6O18 with Iron traces)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3)
sedimentary