Blue Chalcedony
Chalcedony (Silicon Dioxide, SiO2)
mineral
Category
Man Made Glass
Browse man made glass specimens identified by the Rock Identifier community.
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Rough Green Fluorite
Fluorite (Calcium Fluoride - CaF2)
mineral
Rose Quartz
Pink Quartz (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
Mineral
Manganese Ore (Psilomelane/Pyrolusite)
Psilomelane ((Ba,H2O)2Mn5O10) and Pyrolusite (MnO2)
Mineral
Quartz (Smoky/Milky variety with matrix)
Silicon Dioxide (SiO2)
mineral
Quartz / Chert
Silicon Dioxide (SiO2)
Mineral / Sedimentary
Quartz (Smoky/Grey Variety)
Silicon Dioxide (SiO2)
mineral
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Milky Quartz Pebble
Quartz (Silicon Dioxide - SiO2)
mineral
Quartzite
Hydrothermal Quartz or Quartzite (SiO2)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Ferruginous Quartz
Iron-stained Quartz (Silicon Dioxide + Fe2O3 / FeO(OH))
mineral
Quartz Pebble (Water-worn)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Red Jasper (River Pebble)
Jasper (Silicon Dioxide, SiO2)
sedimentary
Chert (specifically Flint or Common Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Feldspar (specifically Orthoclase)
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Red Sandstone
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
sedimentary
Quartzite with Quartz Vein
Metamorphosed sandstone (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Quartzite
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartzose)
Arenite (SiO2 principal)
sedimentary
Sandstone
Arenite (primarily Quartz SiO2)
sedimentary
Red Sandstone
Arenite (with Iron Oxide / Hematite), Formula: SiO2 (Quartz) + Fe2O3 (Hematite coating)
sedimentary
Sandstone
Arenite
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Arsenopyrite in Quartz Matrix
Arsenopyrite (FeAsS) with Quartz (SiO2)
mineral
Feldspar Rich Granite with Limonite Staining
K-Feldspar Granite (KAlSi3O8)
igneous
Sandstone (Red Arkose)
Sandstone (Arkose variant, primarily SiO2 with KAlSi3O8)
sedimentary
Feldspar (specifically Orthoclase)
Potassium Aluminum Silicate (KAlSi3O8)
mineral