Feldspar (Orthoclase)
Potassium Feldspar (KAlSi3O8)
Category
Browse antropogenic (man made glass byproduct) specimens identified by the Rock Identifier community.
Feldspar (Orthoclase)
Potassium Feldspar (KAlSi3O8)
Sandstone (Micaceous)
Arenite (composed primarily of SiO2)
Quartzite Pebble
Quartzite (primarily SiO2)
Sandstone
Arenite (Sedimentary Rock)
Quartzite Pebbles
Crystalline silica rock (SiO2)
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Sunstone (Heliolite)
Plagioclase Feldspar ((Ca,Na)(Al,Si)4O8)
Sandstone (Yellow/Tan)
Clastic sedimentary rock (primarily SiO2 with iron oxide staining)
Quartzite Pebble
Quartzite (primarily SiO2)
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
Limestone
Calcium Carbonate (CaCO3)
Sandstone
Arenite (Siliclastic sedimentary rock)
Sandstone
Arenite (primarily SiO2)
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
Sandstone
Arenite (composed primarily of SiO2)
Quartzite
Quartzite (SiO2)
Sandstone
Arenite (primarily SiO2)
Quartzite
Quartzite (primarily SiO2)
Sand (Construction Grade)
Unconsolidated siliciclastic sediment (primarily SiO2)
Sandstone (Red)
Arenite (SiO2 with Fe2O3)
Sandstone
Arenite
Sandstone
Arenite/Quartz Arenite
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3/FeO(OH) cementing agents)
Feldspar (Orthoclase/Potassium Feldspar)
KAlSi3O8 (Potassium Aluminum Silicate)
Quartzite
Quartzite (SiO2)
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (primarily SiO2)
Limestone
Calcium Carbonate (CaCO3)
Polished pale stone, likely limestone or quartzite pebble
Most consistent with micritic limestone (calcite, CaCO₃), though the image cannot confirm mineralogy
Quartz-rich breccia or vein quartz with dark inclusions
Milky quartz (SiO₂), likely brecciated and cemented with iron oxides and dark mica/amphibole minerals
Flint
SiO2 (Microcrystalline Quartz / Chert)
Flint / Chert
Silicon dioxide (SiO2)
Flint
SiO2 (Microcrystalline Quartz / Chert)
Chert (Flint / Chalcedony pebble)
Silicon Dioxide (SiO2)
Quartzite
Quartzite (Primary mineral: SiO2)
Quartz with Iron Staining
Silicon Dioxide (SiO2) with Fe2O3 (Hematite/Limonite) inclusions
Jasper
Silicon dioxide (SiO2)
Chert (Iron-rich or Slate-like variant)
Silicon Dioxide (SiO2)
Milky Quartz
Silicon dioxide (SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Black Sapphire
Corundum (Al2O3 with iron and titanium impurities)
Potassium Feldspar
Orthoclase (KAlSi3O8)
Olivine Basalt
Mafic Volcanic Rock (rich in (Mg, Fe)2SiO4)