Man Made Object (Metalwork)

Sandstone (Quartzose Sandstone)

Arenite (SiO2 primarily)

Milky Quartz

Silicon Dioxide (SiO2)

Biotite Mica

K(Mg, Fe)3AlSi3O10(F, OH)2

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Kimberlite

Kimberlite (Potassic ultramafic igneous rock)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Milky/Granular)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 based)

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Orthoclase Feldspar

Potassium aluminum silicate (KAlSi3O8)

Quartzite

Quartzite (SiO2)

Quartzite (or Milky Quartz pebble)

Quartzite (Metamorphosed Sandstone) / Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Rough Quartz (likely Rose or Smoky variant)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Limestone (specifically Bituminous or Carbonaceous Limestone)

Calcium Carbonate (CaCO3) with Organic Impurities

Orange Calcite

Calcium Carbonate (CaCO3)

Clear Quartz

Quartz (Silicon Dioxide - SiO2)

Magnetite / Iron Ore

Magnetite (Fe3O4)

Chert (and Flint variant)

Chert (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Sandstone (likely Arkosic)

Clastic Sedimentary Rock (primarily SiO2 with Feldspar)

Milky Quartz

Silicon Dioxide (SiO2)

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

Blue Apatite

Chlorapatite / Fluorapatite (Ca5(PO4)3(F,Cl,OH))

Banded Iron Formation (BIF)

Banded Iron Formation (Magnetite-Hematite-Chert)

Quartz Vein in Metamorphic Rock

Silicon Dioxide (SiO2) within Metasedimentary host

Sandstone

Arenite (primarily SiO2)

Ironstone (with Limonite/Goethite)

Ferruginous Sedimentary Rock (contains Limonite FeO(OH)·nH2O and Hematite Fe2O3)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Potassium Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

Quartzite

Quartzite (primarily SiO2)

Halite (Rock Salt)

Halite (Sodium Chloride, NaCl)

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily SiO2)