Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Category
Sedimentary (Secondary Classification For A Weathered Mineral Specimen)
Browse sedimentary (secondary classification for a weathered mineral specimen) specimens identified by the Rock Identifier community.
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Mixed Mineral Collection (Quartz, Amethyst, Rose Quartz, Pyrite, etc.)
Mixed Silicates and Sulfides (SiO2, FeS2)
mineral
Septarian Nodule Geode
Septarian concretions (composed of Calcite, Aragonite, and Limestone)
sedimentary
Geodal Limestone / Calcite Druze
Calcium Carbonate (CaCO3)
sedimentary
Bornite (Peacock Ore)
Bornite (Cu5FeS4)
mineral
Chert (Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Common Opal
Hydrated Silica (SiO2·nH2O)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Bauxite
Bauxite (Al(OH)3, γ-AlO(OH), and α-AlO(OH))
sedimentary
Chert (specifically Banded Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone (Quartzose Sandstone)
Arenite (SiO2)
sedimentary
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Agate (translucent pebble)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Quartz (Gravel Pebble)
Silicon Dioxide (SiO2)
mineral
Chert
Cryptocrystalline Quartz (SiO2)
sedimentary
River Stone (likely Mudstone or Siltstone)
Lutite (Clastic sedimentary rock composed of clay and silt-sized particles)
sedimentary
Moqui Marble (Concretion)
Iron oxide concretion (Goethite/Hematite and Sandstone)
sedimentary
Opal
Hydrated Amorphous Silica (SiO2·nH2O)
mineral
Sandstone (Banded)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Mica Schist with Iron Staining
Mica Schist
metamorphic
Ferruginous Sandstone (with Pyrite/Gold associations)
Ferruginous Arenite (SiO2 + Fe2O3)
sedimentary
Basalt River Stone
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Chert (Iron-rich River Pebble)
Cryptocrystalline Quartz (SiO2)
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Agate and Amethyst (Quartz variants)
Silicon Dioxide (SiO2) - Microcrystalline Quartz and Crystalline Quartz
mineral
Bauxite
Bauxite (mainly Al(OH)3, AlO(OH))
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite with inclusions
Quartzite (SiO2) with likely Feldspar or Iron oxide inclusions
metamorphic
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Quartzite-rich)
Clastic sedimentary rock (SiO2 primary)
sedimentary
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Sandstone (River Cobble)
Clastic Sedimentary Rock (primarily Quartz with Feldspar)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Chert / Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Almandine Garnet in Matrix
Almandine, Fe3Al2(SiO4)3
metamorphic
Asphalt Concrete
Bituminous Concrete
sedimentary (artificial)
Chert (Common Opal or Flint variant)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) in Geode form
sedimentary