Quartz Geode Fragment
Silicon Dioxide (SiO2)
Category
Browse sedimentary rock (possibly conglomerate or breccia with a quartz vein) specimens identified by the Rock Identifier community.
Quartz Geode Fragment
Silicon Dioxide (SiO2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
White Quartz (Tumbled)
Silicon Dioxide (SiO2)
Sandstone with Quartz Crystal Infill
Quartz-cemented quartz arenite
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
Quartz with Iron Stains
Quartz (SiO2) with iron oxide/hydroxide staining
Milky Quartz
Silicon Dioxide (SiO2)
Sandstone
Clastic sedimentary rock (Quartz arenite or arkose)
Milky Quartz
Silicon Dioxide (SiO2)
Jasper
Silicon Dioxide (Quartz variety, SiO2)
Pyrite in Matrix
Iron Sulfide (FeS2) embedded in host rock
Pebble (likely Quartz or Chert)
SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.
Quartz Sand Grain / Micro Crystal
Silicon Dioxide (SiO2)
Pink Dyed Agate (Pink Agate Slice)
Silicon Dioxide (SiO2) - Chalcedony / Cryptocrystalline Quartz
Red Sandstone
Quartz Arenite (iron-stained) / SiO2
Quartz Pebble
Silicon Dioxide (SiO2)
Mixed Tumbled Rocks and Minerals Collection
Mixed Minerals and Rocks (Quartz, Feldspar, Jasper, Agate, Lapis Lazuli, Sodalite, Rose Quartz, Fluorite, etc.)
Orange Calcite
Calcium Carbonate (CaCO3)
Quartz Geode
Silicon Dioxide (SiO2)
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz with Fe2O3 staining)
Quartz (specifically Clear Quartz or Rock Crystal)
Silicon Dioxide (SiO2)
Glauconitic Sandstone
Glauconitic Quartz Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)
White Quartz
Silicon Dioxide (SiO2)
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
Aventurine (Green Quartz)
Silicon dioxide with inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
Chevron Amethyst
Silicon Dioxide (SiO2) with iron impurities
Gold Nugget
Native Gold (Au)
Quartz Pebble
Silicon Dioxide (SiO2)
Pyrite with Quartz
Iron Sulfide (FeS2) with Silicon Dioxide (SiO2)
Milky Quartz Pebble
Silicon Dioxide (SiO2)
Quartz (Druzy / Crystalline)
Silicon Dioxide (SiO2)
Sandstone Pebble with Mineral Encrustation
Quartz Sandstone with Calcite/Halite Crust
Quartz (Milky variant)
Silicon Dioxide (SiO2)
Quartz Pebble
Silicon Dioxide (SiO2)
Quartz Pebble
Silicon Dioxide (SiO2)
Polished flint/chert pebble
Microcrystalline quartz (SiO₂), commonly called chert or flint
Dyed Quartz Geode
Silicon Dioxide (SiO2) with artificial purple dye
Citrine Geode
Silicon Dioxide (Quartz variety, often heat-treated amethyst): SiO2
Sandstone
Clastic Sedimentary Rock
Milky Quartz (Tumbled)
Silicon Dioxide (SiO2)