Red Jasper
Silicon Dioxide (SiO₂)
Category
Browse sedimentary rock (cryptocrystalline quartz) specimens identified by the Rock Identifier community.
Red Jasper
Silicon Dioxide (SiO₂)
Chert
Microcrystalline or cryptocrystalline quartz
Chert / Flint Arrowheads
Cryptocrystalline Quartz (SiO2)
Blue Chalcedony
Cryptocrystalline Quartz (SiO2)
Quartz-veined Metamorphic Pebble
Silicate-rich metamorphic rock with quartz veins (SiO2)
Agate (Water-Worn)
Cryptocrystalline quartz (SiO2)
Chert (Agatized/Chalcedony variety)
Microcrystalline Quartz (SiO2)
Chert / Quartzite
Silicon Dioxide (SiO2)
Banded Agate with Drusy Quartz
Cryptocrystalline Quartz (SiO2) with macrocrystalline Quartz
Geode
Quartz nodule / Chalcedony-lined cavity
Banded Agate
Cryptocrystalline Quartz (SiO2)
Chert / Flint
Cryptocrystalline quartz (SiO2)
Chert (Arrowhead Fragment)
Cryptocrystalline quartz (SiO2)
Chalcedony
Cryptocrystalline Quartz (SiO2)
Quartz-veined Sandstone Pebble
Quartzite-veined Arenite
Geode / Fossilized Gastropod or Shell Cast
Silicon dioxide (Quartz) replacement / fossil mold
Chalcedony (Agate / Quartz Pebble)
Silicon Dioxide (SiO2)
Chert Nodules or Concretion
Cryptocrystalline Quartz (SiO2)
Chert with Quartz Veining
Microcrystalline Silica (SiO2)
Geode
Quartz / Chalcedony nodule
Agate Geode
Silicon Dioxide (SiO2) - Chalcedony variety
Beach Agate / Jasper Pebble
Cryptocrystalline Quartz (SiO2)
Jasper Pendant
Chalcedony (Quartz) - SiO2
Agate Geode
Silicon Dioxide (SiO2) - Chalcedony variety
Chalcedony (Agate / Chert)
Silicon Dioxide (SiO2)
Chert
Cryptocrystalline Quartz (SiO2)
Quartz Vein in Host Rock
Silicon dioxide (SiO2) veining in silicate matrix
Chert / Flint
Cryptocrystalline Quartz (SiO2)
Chert (Flint)
Cryptocrystalline Quartz (SiO2)
Chert Concretion
Sedimentary Cryptocrystalline Quartz (SiO2)
Chalcedony
Cryptocrystalline Quartz (SiO2)
Chert Arrowhead
Cryptocrystalline Quartz (SiO2)
Druzy Chalcedony (Agate Geode)
Silica (SiO2) - Cryptocrystalline Quartz with druzy macrocrystalline quartz
Chert (variations include Flint or Jasper)
Cryptocrystalline Quartz (SiO2)
Yellow chalcedony or quartz fragment
Microcrystalline quartz, SiO₂ (tentative; possibly iron-stained chalcedony)
Chert / Jasper
Sedimentary Cryptocrystalline Quartz (SiO2)
Carnelian and White Quartz Bracelet
Silicon Dioxide (SiO2) - specifically Carnelian (Chalcedony) and Rock Crystal/Snow Quartz
River Agate (Chert/Chalcedony)
Cryptocrystalline Quartz (SiO2)
Yellow Chert
Sedimentary cryptocrystalline quartz (SiO2)
Quartz pebble (Agate / Chalcedony)
Silicon Dioxide (SiO2)
Chert
Microcrystalline quartz (SiO2)
Chalcedony (Common Agate)
Cryptocrystalline Quartz (SiO2)