Red Sandstone
Arenite (predominantly SiO2 with Fe2O3)
sedimentary
Category
Man Made Glass
Browse man made glass specimens identified by the Rock Identifier community.
Orpiment
Orpiment (As2S3)
mineral
Sandstone (Weathered Pebble)
Arenite (primarily SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Bull Quartz (Milky Quartz)
Quartz (Silicon Dioxide - SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Celestine (or Celestite)
Strontium sulfate (SrSO4)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Efflorescence (on Clay Brick)
Crystalline salt deposits (typically Sodium Sulfate Na2SO4, Calcium Carbonate CaCO3, or Potassium Sulfate K2SO4)
Mineral precipitate (anthropogenic context)
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Chert (Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone (Ferruginous)
Clastic Sedimentary Rock (SiO2 with Fe2O3/FeOOH cement)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (likely Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement
sedimentary
Sandstone
Arenite (SiO2 with Fe2O3)
sedimentary
Coarse Sand Grain / Lithic Fragment
Clastic Sediment (Lithic fragment or Quartz/Feldspar grain)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartzose type)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2 with various cementing agents)
sedimentary
Arsenopyrite in Quartz Matrix
Arsenopyrite (FeAsS)
mineral
Sandstone (Ferruginous)
Arenite (with Goethite/Limonite cement)
sedimentary
Sandstone
Arenite (composed primarily of Quartz: SiO2)
sedimentary
Quartzite
Quartzite (SiO2 principal component)
metamorphic
Pink Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Orthoclase Feldspar
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Chert (Nodular)
Cryptocrystalline Quartz (SiO2)
sedimentary
Tree Agate
Dendritic Agate (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Tree Agate
Dendritic Agate (Silicon Dioxide, SiO2)
mineral
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Slag (Industrial Byproduct)
Ferrous/Non-ferrous Silicate
igneous (artificial/anthropogenic)