Agate
Silicon Dioxide (SiO2) - Variety of Chalcedony
mineral
Category
Sedimentary (Physico Chemical Precipitate)
Browse sedimentary (physico chemical precipitate) specimens identified by the Rock Identifier community.
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartz / Quartzite
Quartz (Silicon Dioxide, SiO2)
metamorphic
Pink Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite Pebbler
Quartzite (primarily SiO2)
metamorphic
Azurite Geode
Azurite (Cu3(CO3)2(OH)2)
mineral
Quartz / Quartzite
Silicon Dioxide (SiO2)
metamorphic
Granite
Granite (Phaneritic Igneous Rock / Quartz, Feldspar, Mica)
igneous
Quartzite (Yellow/Iron-stained Quartz)
Quartzite (primarily SiO2 with iron oxide impurities)
metamorphic
Gold (in Opaque Matrix/Jewelry)
Native Gold (Au)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Azurite and Malachite on Matrix
Cu3(CO3)2(OH)2 (Azurite) and Cu2CO3(OH)2 (Malachite)
mineral
Blue Quartzite (Aventurine variety)
Silicon Dioxide (SiO2) with inclusions of Dumortierite or Magnesio-riebeckite
metamorphic
Orange Quartzite (Tumbled Beach Pebble)
Quartzite (primarily SiO2)
metamorphic
Red Jasper (with Quartz Veins)
Jasper (var. chert, SiO₂)
Sedimentary Rock (technically chert, a microcrystalline quartz)
Rough Green Tourmaline (Verdelite)
Elbaite (Complex Silicate) - Na(Li,Al)3Al6(BO3)3Si6O18(OH)4
mineral
Andesite
Andesite (Intermediate Extrusive Volcanic Rock)
igneous
Quartz Pebble (with Mica or Iron staining)
Silicon Dioxide (SiO2)
mineral
Dolerite (Diabase)
Dolerite / Diabase
igneous
Sandstone (Quartz-rich)
Arenite (SiO2)
sedimentary
Limonite-stained Quartzite
Quartzite with Limonite (FeO(OH)·nH2O) staining
metamorphic
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Mahogany Obsidian
Obsidian (Volcanic Glass) with Hematite/Magnetite inclusions
igneous
Quartzite
Quartzite (Primary mineral: Silicon Dioxide, SiO2)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Pink Amethyst Geode
Silicon Dioxide (SiO2) with Hematite/Iron impurities
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Astrophyllite
Potassium Sodium Iron Manganese Titanium Silicate Hydroxide (K3NaFe7Ti2Si8O24(OH)7)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Sea Glass (Turquoise/Aqua)
Amorphous Silica (SiO2) with transition metal dopants
Anthropogenic (Man-made material processed by nature)
Apatite
Apatite Group (e.g., Fluorapatite Ca5(PO4)3F, Chlorapatite Ca5(PO4)3Cl, Hydroxylapatite Ca5(PO4)3(OH))
mineral
Dyed Magnesite (often sold as Red Turquoise or Howlite)
Magnesium Carbonate (MgCO3)
mineral
Anthracite Coal
Anthracite (Carbon-based organic sedimentary rock exposed to metamorphic heat/pressure; Chemical composition is approximately 86%–98% Carbon)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz / Quartzite Pebble
Silicon Dioxide (SiO2)
metamorphic
Obsidian (Black)
Obsidian (High-silica volcanic glass)
igneous
Efflorescence (on Clay Brick)
Crystalline salt deposits (typically Sodium Sulfate Na2SO4, Calcium Carbonate CaCO3, or Potassium Sulfate K2SO4)
Mineral precipitate (anthropogenic context)
Turquoise
Turquoise (Hydrated copper aluminum phosphate, CuAl6(PO4)4(OH)8·4H2O)
Mineral
Quartzite
Quartzite (composed primarily of Quartz, SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic