Chert (often called Flint)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Category
Glass
Browse glass specimens identified by the Rock Identifier community.
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Rose Quartz
Silicon Dioxide (SiO2) with trace Titanium, Manganese or Iron
mineral
Fire Quartz (Hematoid Quartz)
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
mineral
Quartz Veined Diorite or Basalt
Crystalline Silicon Dioxide (Quartz) in Mafic Igneous Host (Basalt/Diorite)
igneous
Milky Quartz
Silicon dioxide (SiO2)
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Quartz (Milky or Cloudy Quartz)
Silicon Dioxide (SiO2)
mineral
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (with Quartz Vein)
Microcrystalline Quartz (SiO2)
sedimentary
Milky Quartz
Quartz / Silicon Dioxide (SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Cobble (River Rock)
Silicon Dioxide (SiO2)
mineral
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Agate
SiO2
Mineral
Chert (Yellow Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Rose Quartz with Girasol Effect
Silicon Dioxide (SiO2)
mineral
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Chert or Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Quartzite (mostly SiO2)
Metamorphic
Sandstone (likely Arkose or Quartz Sandstone)
Arenite (SiO2 + varied clasts)
sedimentary
Mixed Quartz and River Pebbles (Stone Collection)
Mixed assortment containing mainly Silicon Dioxide (SiO2)
igneous, sedimentary, metamorphic, and mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within metamorphic/igneous matrix
igneous/metamorphic
Yellow Quartzite (Yellow Jasper)
Silicon Dioxide (SiO2)
metamorphic
Chert / Jasper
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Chert (Silicon Dioxide, SiO2)
sedimentary
Chert (Flint) Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (or potentially massive Quartz/Quartzite)
SiO2 (Silicon Dioxide)
sedimentary (if chert) / metamorphic (if quartzite)
Quartz (Milky or Rough Variety)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert with Quartz Veins
Microcrystalline Quartz (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
River Stone (Quartzite Pebble)
Metamorphosed Quartz-rich Sandstone (SiO2)
metamorphic
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Quartz (Milky or Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic