Sandstone (Ferruginous)
Sandstone (primarily SiO2 with Iron Oxide cement)
sedimentary
Category
Manufactured Stone
Browse manufactured stone specimens identified by the Rock Identifier community.
Basalt Pebble
Basalt
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Clear Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Clear Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone (with potential iron-oxide staining)
Arenite (primarily SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Bauxite
Bauxite (Mixture including Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Diaspore α-AlO(OH))
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Fossiliferous Limestone (Coral Fossil)
Scleractinian Coral in Calcium Carbonate (CaCO3)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartz Crystal (Amethyst)
Silicon Dioxide (SiO2)
mineral
Feldspar (Orthoclase)
Potassium Feldspar (KAlSi3O8)
mineral
Bauxite
Bauxite (mixture including Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Diaspore α-AlO(OH))
sedimentary
Clear Quartz crystals on a Matrix base (Geode fragment)
Silicon Dioxide (SiO2)
mineral
Quartz (Crystal)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (composed of SiO2, CaCO3, or iron oxides)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Potassium Feldspar
Orthoclase (KAlSi3O8)
mineral
Tumbled yellow calcite
Calcite (CaCO₃), likely honey/yellow calcite
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone (Weathered Pebble)
Calcium Carbonate (CaCO3) / Limestone
sedimentary
Chert (often called Flint in this variation)
Silicon dioxide (SiO2) - Microcrystalline quartz
sedimentary
Chert (variations include Flint/Novaculite)
Chert (formula: SiO2)
sedimentary
Quartz Pebble (Sea Glass-like texture)
Silicon Dioxide (SiO2)
mineral
Satin Spar Selenite
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
mineral
Dumortierite Quartz (Blue Quartz)
Al7BO3(SiO4)3O3 (Aluminum Boro-silicate included in Quartz)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Satin Spar Selenite
Gypsum (CaSO4·2H2O)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Fluorite
Calcium Fluoride (CaF2)
mineral