Quartz Geode (Nodule)
Silicon Dioxide (SiO2)
sedimentary or igneous
Category
Sedimentary (Formed From Silica Deposits)
Browse sedimentary (formed from silica deposits) specimens identified by the Rock Identifier community.
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
Quartz (Drusy/Crystalline)
Silicon Dioxide (SiO2)
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Chert (Quartz Variety)
Silicon Dioxide (SiO2)
sedimentary
Rhodochrosite with Pyrite and Quartz
Manganese Carbonate (MnCO3)
mineral
Puddingstone
Conglomerate (specifically a type of jasper conglomerate or quartz conglomerate)
Sedimentary
Chalcedony Nodule in Matrix
Silicon Dioxide (SiO2)
mineral
Sandstone (Wonderstone)
Silicified Sandstone / Orthoquartzite with Liesegang rings
sedimentary
Sandstone (likely Quartzite-grade)
Arenite (primarily SiO2)
sedimentary
Geode (Unopened)
Siliceous Geode (SiO2)
sedimentary
Limestone with Calcite Veins
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Barite Rose on Marcasite
Barium Sulfate (BaSO4) on Iron Sulfide (FeS2)
mineral
Amethyst
Amethyst (Purple Quartz); formula: SiO2 (Silicon Dioxide)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Jasper
Jasper (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Conglomerate
Conglomerate (Clastic Sedimentary Rock)
sedimentary
Pyrite (on Quartz/Host Rock)
Iron Sulfide (FeS₂)
mineral
Amethyst Geode (Thunderegg)
Silicon Dioxide (SiO2) - Quartz Variety: Amethyst
mineral
Carnelian (Flame Polished)
Carnelian (SiO2 with Iron Oxide impurities)
mineral
Siltstone with flute casts or scratch marks
Clastic Sedimentary Rock (Siltstone/Fine-grained Sandstone)
sedimentary
Red Granite
Felsic intrusive igneous rock (K-feldspar rich Granite)
igneous
Hematite
Iron(III) oxide (Fe2O3)
mineral
Chert (often called Flint for dark varieties)
Chert (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2)
sedimentary
Blue Agate (Dyed)
Silicon Dioxide (SiO2) with artificial pigment
mineral
Sandstone (Quartzose)
Arenite (predominantly SiO2)
sedimentary
Chrysocolla in Jasper (Chryso-Jasper)
Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O (Chrysocolla) + SiO2 (Jasper)
mineral
Quartz Vein in Pelite (Metamorphic Rock)
Hydrothermal Quartz Veining in Metasedimentary Rock (SiO2)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Ocean Jasper (Orbicular Jasper)
Silicon Dioxide (SiO2) with iron and other impurities
sedimentary
White Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides (Goethite)
sedimentary
Fluorite (Rainbow Fluorite)
Calcium Fluoride (CaF2)
Mineral
Yellow Chalcedony (Carnelian/Yellow Agate)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Mineral
River Pebbles (Sandstone and Quartzite)
SiO2 (Quartz) dominated clastic rocks
sedimentary and metamorphic
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone Cobble
Clastic Sedimentary (Sandstone)
sedimentary
Banded Agate (with small Geode cavity)
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Red Jasper
Jasper (Silicon Dioxide) - SiO2
sedimentary/mineral