Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Category
Rock (Likely Sedimentary)
Browse rock (likely sedimentary) specimens identified by the Rock Identifier community.
Mixed Tumbled Gemstones and River Rocks
Mixed Decorative Stones (predominantly Silicon Dioxide - SiO2 variants)
Mixed (Igneous, Sedimentary, Metamorphic, and Minerals)
Shale (with minor calcite veining)
Clastic sedimentary rock (primarily clay minerals and quartz)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Jasper with Quartz Veining
Silicon Dioxide (SiO2) - Opaque cryptocrystalline variety of Quartz
sedimentary
Quartz Veinated Sandstone or Siltstone
Silicon Dioxide (SiO2) within a clastic sedimentary matrix
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) - Impure Cryptocrystalline Quartz
sedimentary
Chert (Common Opal/Agate mixture)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Concretion with Quartz Veining
Septarian Concretion (CaCO3 / SiO2)
sedimentary
Jasper (Iron-stained Quartzite/Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Agate Geode
Silicon Dioxide (SiO2) - variety Chalcedony/Quartz
sedimentary
Quartz on Schist
Silicon Dioxide (SiO2) on Foliated Metamorphic Rock
metamorphic
Yellow Quartzite River Cobble
Meta-quartzite (SiO2 with iron oxide staining)
metamorphic
Sandstone (with Lichen)
Arenite (primarily SiO2)
sedimentary
Chert (Septarian Concretion/Nodule)
Microcrystalline silica (SiO2) with carbonate mineral veining
sedimentary
Dalmatian Jasper (Dalmatian Stone)
Peralkaline rhyolite
igneous
Black Opal
Hydrated Silica (SiO2·nH2O)
mineral
Banded Agate
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Geode (Quartz)
Silicon Dioxide (SiO2)
mineral
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide impurities), formula: SiO2
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
White Precious Opal
Hydrated Silica (SiO2·nH2O)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Pink Opal (Common Opal)
Amorphous Hydrated Silica (SiO2·nH2O)
mineral
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (SiO2 + Fe2O3)
sedimentary
Chert (Jasper variation)
Silicon Dioxide (SiO2)
sedimentary
Red Sandstone
Arenite
sedimentary
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Gneiss (specifically Micaceous Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Halite
Halite (Sodium Chloride, NaCl)
mineral
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Bumblebee Jasper
Volcanic Tuff (mixture of Quartz, Sulfur, Hematite, and Orpiment)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Red Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Jasper (specifically Red or Brecciated Jasper variant)
Jasper (Microcrystalline Quartz - SiO2)
sedimentary
Yellow Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Red Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Fossiliferous Limestone (Coquina / Shell Conglomerate)
Bioclastic Limestone (composed primarily of CaCO3)
sedimentary