Carnelian
Carnelian (a variety of Chalcedony, SiO2)
Mineral
Category
Sedimentary Rock (Cryptocrystalline Quartz)
Browse sedimentary rock (cryptocrystalline quartz) specimens identified by the Rock Identifier community.
Jasper
Silicon Dioxide (SiO2) - Impure Variety of Chert
sedimentary
Gneiss
Gneiss (Metamorphic rock)
metamorphic
Sandstone (Banded)
Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide staining)
sedimentary
Sandstone (with Concretion)
Arenite / Quartzose Sandstone
sedimentary
Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Druzy Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartz Geode / Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Jasper, Agate, Quartz Mix (Polished Beads)
SiO₂ (Silicon Dioxide) for Quartz. Jasper and Agate are cryptocrystalline varieties of Quartz.
Mineral/Semiprecious Gemstone (variety of Quartz)
Petrified Wood (Silicified Wood)
Silicified Paleoflora (mainly Quartz, SiO2)
metamorphic
Red Jasper (possibly Agatized Jasper)
Jasper (Silicon Dioxide, SiO2 with Fe2O3 inclusions)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Chert (Flint nodule)
Silicon dioxide (SiO2)
sedimentary
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Dyed and Metallic Coated Agate Geode
Silicon Dioxide (SiO2) with titanium/gold vapor deposition coating
sedimentary (primary) with artificial modification
Quartz (Clear/Smoky Geode fragment)
Silicon Dioxide (SiO2)
mineral
Tiger's Iron
Pseudomorphic Quartz Aggregate (contains SiO2 with Fe2O3 and FeOOH)
metamorphic
Petrified Wood
Silicified Wood (SiO2 as Quartz/Chert/Chalcedony)
sedimentary
Yellow Chalcedony (Agate or Citrine Quartz)
Silicon Dioxide (SiO2)
mineral
Druzy Quartz (part of a Geode)
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 cement)
sedimentary
Basalt and Quartz Pebble
Basalt (Igneous) and Quartzite/Quartz (SiO2) pebble
igneous and sedimentary
Sandstone (Pebble)
Arenite (SiO2 based)
sedimentary
Mookaite Jasper
Silicified Radiolarite (Silicon Dioxide: SiO2)
sedimentary
Dalmatian Stone (often misnamed Dalmatian Jasper)
Aplite (with hornblende/arfvedsonite inclusions)
igneous
Chert (with small quartz inclusion)
Microcrystalline Silica (SiO2)
sedimentary
Agate
Agate (Silicon Dioxide - SiO2)
mineral
Banded Sandstone (Liesegang Rings)
Sedimentary Arenite (SiO2 with FeO/Fe2O3 impurities)
sedimentary
Sandstone (River Cobble)
Arenite
sedimentary
Sandstone
Arenite
sedimentary
Quartz / Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Banded Agate (specifically Moss Agate or Plume Agate variety)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Quartz (Silicon Dioxide, SiO2)
mineral
Chert (specifically Flint or Gray Chert)
Silicon Dioxide (Microcrystalline Quartz), SiO2
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Chert Nodule)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Conglomerate
Conglomerate (Clastic Sedimentary Rock)
sedimentary