Industrial Byproduct

Almandine Garnet

Almandite (Fe3Al2(SiO4)3)

Anthracite

Anthracite (Carbon)

Quartz Pebble (Citrine-colored or Stained Quartz)

Silicon Dioxide (SiO2)

Quartzite

Quartzite (SiO2)

Blue Sapphire (Tumbled/Polished)

Corundum (Al2O3)

Epidote with Unakite characteristics

{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

Quartzite

Quartzite (primarily SiO2)

Massive Quartz with Host Rock

Silicon Dioxide (SiO2)

Quartzite

Quartzite (SiO2)

Blue Sapphire

Corundum (Al2O3 with trace amounts of iron and titanium)

Diamond

Diamond (Pure Carbon, C)

Orange Calcite (Dogtooth/Cluster)

Calcium Carbonate (CaCO3)

Quartzite (River Cobble)

Quartzite (Metamorphosed Quartz Sandstone, SiO2)

Anthracite Coal

Anthracite

Limestone

Calcium Carbonate (CaCO3)

Amethyst Quartz

SiO2 (Silicon Dioxide)

Quartzite

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily Quartz, SiO2)

Granitic Pegmatite

Phaneritic Granite with Potassium Feldspar (KAlSi3O8), Quartz (SiO2), and Plagioclase

Quartzite

Quartzite (primarily SiO2)

Sodalite

Na8(Al6Si6O24)Cl2

Mica Schist

Mica Schist (Quartz-Biotite-Muscovite Schist)

Marble

Crystalline Limestone (mostly CaCO3 / Calcium Carbonate)

Tourmalinated Quartz

Crystalline Silicon Dioxide with Schorl inclusions (SiO2 + NaFe3Al6(BO3)3Si6O18(OH)4)

Ferruginous Sandstone

Ferruginous Clastic Sedimentary Rock

Chert (Green variety)

Silicon Dioxide (SiO2)

Pumice

Vesicular Rhyolite or Dacite

Garnet (Almandine)

Almandine (Fe3Al2(SiO4)3)

Basalt

Basalt (Mainly Plagioclase Feldspar and Pyroxene)

Olivine (Peridotite)

Magnesium iron silicate ((Mg, Fe)2SiO4)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Chert (Jasper/Common Opal transition)

Microcrystalline Quartz (SiO2) with iron oxide inclusions

Iolite

Cordierite (Magnesium iron aluminium silicate)

Quartzite Pebble

Quartzite (SiO2)

Quartzite

Quartzite (composed primarily of SiO2)

Basalt

Extrusive Mafic Igneous Rock (composed primarily of plagioclase, pyroxene, and olivine)

Anthracite Coal

Anthracite (Carbon-rich Sedimentary Rock)

Yellow Calcite

Calcium Carbonate (CaCO3)

Quartzite pebble

Quartzite (SiO2)

Orange Quartz (Citrine Quartz variety)

Silicon Dioxide (SiO2)

Oyster Shell (Aragonite/Calcite)

Calcium Carbonate (CaCO3)

Quartzite

Metamorphosed Sandstone (SiO2 - Silicon Dioxide)