Riverstone Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Category
Sedimentary (Formed From Silica Deposits)
Browse sedimentary (formed from silica deposits) specimens identified by the Rock Identifier community.
Learn about Sedimentary (Formed From Silica Deposits) in the encyclopedia
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Quartz (Chert / Agate / Chalcedony)
Silicon Dioxide (SiO2)
mineral
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Chert / Flint
Microcrystalline quartz (SiO2)
sedimentary
Tumbled Stone Collection (Fluorite, Sodalite, Moss Agate, Amethyst/Charoite, and Grey Agate)
Silica (SiO2) and Calcium Fluoride (CaF2) based minerals
mineral
Polished carnelian
Carnelian, orange-red cryptocrystalline quartz (SiO₂), chalcedony variety
gemstone
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Common Chert)
Cryptocrystalline Quartz (SiO2)
sedimentary
Tumbled brown stone, likely chert or jasper
Microcrystalline quartz (SiO₂), possibly iron-stained chert/jasper
sedimentary
Ironstone (iron-oxide-rich rock)
Likely goethite/limonite-rich ironstone; exact identification requires closer examination
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Yellow Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Tumbled Jasper
Silicon dioxide with impurities (Microcrystalline Quartz, SiO2)
sedimentary
Jasper with Hematite inclusions
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)
sedimentary
Fossil Shark Tooth
Lamniformes (order) - likely Cretalamna or Carcharias species
fossil
Red Zebra Jasper
Microcrystalline quartz (Chalcedony), SiO2
sedimentary
Banded chert or siliceous sedimentary rock
Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide staining and possible carbonate/clay layers
sedimentary
Quartz crystal fragment
Quartz, silicon dioxide (SiO₂)
mineral
Chalcedony (Agate / Chert)
Silicon Dioxide (SiO2)
mineral
Fossilized shell fragment
Indeterminate fossil mollusk; likely a silicified or mineral-replaced bivalve/gastropod fragment
fossil
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint in dark varieties)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Green Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Red carnelian (red chalcedony)
Carnelian, a microcrystalline variety of quartz (SiO₂), commonly colored by iron oxides
gemstone
Chert (Flint) with Limestone Matrix
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)
mineral
Jasper River Pebble
Jasper (Silicon Dioxide, SiO2)
sedimentary (cryptocrystalline quartz)
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Tumbled jasper (likely picture/brecciated jasper)
Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides
mineral
Chert (specifically Flint or Common Opal fragment)
Cryptocrystalline Silica (SiO2)
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Amber Flint (Chert)
Cryptocrystalline Quartz (Silicon Dioxide, SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides
sedimentary
Chert (Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Carnelian
SiO2 (Microcrystalline Quartz / Chalcedony)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Carnelian
Silicon Dioxide, variety of chalcedony (SiO2)
gemstone
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Silicified oyster fossil
Fossil oyster shell, commonly Ostrea or Crassostrea, replaced or encrusted by chalcedony/quartz
fossil
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Crazy Lace Agate
Silicon Dioxide (SiO2)
sedimentary