Mineral (Man Enhanced)

Quartz (Milky/Vein Quartz)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

White Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Water-worn Pebble)

Quartz (Silicon Dioxide, SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Milky Quartz Pebble (Tumbled Quartzite)

Silicon Dioxide (SiO2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Celestine (or Celestite)

Strontium sulfate (SrSO4)

Ferruginous Quartz (Iron-stained Quartz)

Silicon Dioxide with Iron Oxide (SiO2 with traces of Fe2O3/FeO(OH))

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Satin Spar (Selenite)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Orange Satin Spar (Satin Spar Selenite)

Satin Spar - Hydrous Calcium Sulfate (CaSO4·2H2O)

Quartz on Matrix

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal Fragments)

Silicon Dioxide (SiO2)

Blue Calcite

Calcite (CaCO3)

Quartz (Iron-Stained or Milky Quartz)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Calcite (likely a tumbled specimen)

Calcite (CaCO 3 )

Chevron Amethyst

SiO2 (Quartz with Manganese/Iron impurities)

Serpentinite

Serpentinite (composed primarily of Serpentine minerals: Mg3Si2O5(OH)4)

Precious Red Coral

Corallium rubrum / Corallium japonicum

Dendritic Jasper

Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions

Mahogany Obsidian

Volcanic glass (SiO2 with Hematite or Magnetite inclusions)

Ironstone Concretion (Limonite/Goethite)

Ironstone (primarily FeO(OH)·nH2O)

Stichtite in Serpentine (Atlantisite)

Mg6Cr2CO3(OH)16·4H2O (Stichtite) / Mg3Si2O5(OH)4 (Serpentine)

Opalite (Synthetic Moonstone/Opal)

Synthetic Silica Glass

Chert (and Limestone)

Chert (consisting of Microcrystalline Quartz, SiO2)

Jasper with Quartz Vein

Silicon Dioxide (SiO2) with impurities

Red Sandstone

Arenite (primarily Quartz SiO2 with Hematite Fe2O3 cement)

Ironstone Concretion (Limonite/Goethite)

Ferruginous Sandstone or Limonite (FeO(OH)·nH2O)

Slag (Industrial Byproduct)

Ferrous/Non-ferrous Silicate

Feldspar-rich Pegmatite

Granitic Pegmatite (principally KAlSi3O8)

Amber

Succinite (fossilized resin)

Cobalt Blue Slag Glass

Amorphous Silicon Dioxide (anthropogenic) with Cobalt additives

Sandstone (with Iron Oxide staining)

Arenite (primarily SiO2 with Fe2O3 staining)

Sandstone (Quartzite-rich Cobble)

Clastic sedimentary rock (primarily SiO2)

Sandstone

Arenite