Vesicular Basalt with Epidote/Amygdaloidal Basalt
Amygdaloidal Basalt (Mg, Fe)2SiO4 + Ca2(Al, Fe)3(SiO4)3(OH)
igneous
Category
Sedimentary (Microcrystalline Quartz)
Browse sedimentary (microcrystalline quartz) specimens identified by the Rock Identifier community.
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Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Quartz (Chert/Chalcedony variety)
Silicon Dioxide (SiO2)
mineral
Jasper with Quartz Vein
Silicon Dioxide (SiO2)
sedimentary
Carnelian
Chalcedony (cryptocrystalline quartz), SiO2
Mineral
Red Jasper
Jasper (a variety of Chalcedony, SiO₂ with impurities)
Mineral
Red Jasper
Quartz (Silicon Dioxide) with Hematite inclusions, SiO2 + Fe2O3
mineral
Jasper (specifically variegated or swamp jasper beads)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Tumbled Agate and Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Quartz Geode (partially formed/chalcedony with iron staining)
Quartz (SiO2) with Chalcedony (cryptocrystalline quartz) and likely Iron Oxides/Hydroxides
Mineral/Sedimentary Rock Feature
Picture Jasper
SiO2, Microcrystalline Quartz
mineral
Agate Geode
Microcrystalline Quartz (SiO2)
mineral
Agate (specifically a Blue Agate Geode Slice)
Chalcedony (cryptocrystalline variety of Quartz); SiO2
mineral
Yellow Jasper
Silicon Dioxide (SiO2) - Opaque variety of Chalcedony/Quartz
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula: SiO2)
sedimentary
Quartz (likely milky/rose quartz variety)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Quartz Vein in Sedimentary Rock
Silicon Dioxide (SiO2) with host Chert or Limestone
mineral
Yellow Quartzite (or Yellow Chalcedony Pebble)
Silicon Dioxide (SiO2)
metamorphic
Chert Nodules in Limestone
Cryptocrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Jasper
Silicon Dioxide (SiO2) - Impure Variety of Chert
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Carnelian (Carnelian Agate)
Cryptocrystalline Quartz (SiO2 with Hematite impurities)
mineral
Banded Agate (Dyed Purple)
Agate (Variety of Chalcedony/Quartz), SiO2
mineral
Quartz (pebble)
Quartz (SiO₂)
Mineral
Carnelian
Carnelian (a variety of Chalcedony, which is a microcrystalline quartz, SiO2)
Mineral (variety of Chalcedony)
Fire Agate (Crackle Agate)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Tree Agate
Silicon Dioxide (SiO2) - Dendritic Agate/Chalcedony
sedimentary
Zebra Jasper
Silicon Dioxide (SiO2) - Macro-crystalline Quartz/Chert with impurities
sedimentary
Agate (Lace Agate Geode Slice)
Silicon Dioxide (SiO2)
mineral
Geode (Quartz chalcedony variety)
SiO2 (Silicon Dioxide)
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Botryoidal Chalcedony (Quartz Var.)
Silicon Dioxide (SiO2)
mineral
Puddingstone
Conglomerate (typically quartz-rich or jasper-rich)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions
sedimentary
Wishing Stone (Basalt/Siltstone with Quartz/Calcite vein)
Carbonaceous Siltstone with Quartz (SiO2) or Calcite (CaCO3) vein
sedimentary
Dalmatian Stone
Dalmatian Jasper (Peralkaline Quartz-Feldspar Rock)
igneous
Yellow Quartz
SiO2 (Silicon Dioxide)
mineral
Red Chert / Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Quartz (in a rock matrix)
Quartz (SiO2)
mineral
Agate
Silicon dioxide (SiO2)
mineral
Banded Agate (specifically Lace Agate type)
Silicon Dioxide (SiO2)
mineral