Mineral Like Industrial Smelting Waste

Granitoid (Granitic Rock)

Granitoid (Quartzo-feldspathic plutonic rock)

Quartz (Rock Crystal) with minor impurities

Quartz (SiO2)

Tourmaline (likely Schorl)

Tourmaline Group Mineral (e.g., Schorl for black varieties); (Na,Ca)(Li,Mg,Fe,Mn,Al)3Al6(BO3)3Si6O18(OH)4

Cubic Zirconia

Zirconium Dioxide (ZrO2)

Bort or Carbonado

C - Polycrystalline Diamond

Anthracite Coal

Anthracite (Carbon-rich metamorphic coal)

Chert (and associated river cobbles)

Silicon dioxide (SiO2)

Graywacke

Graywacke

Quartzite River Pebbles

Quartzite (primarily SiO2)

Quartzite

Quartzite (SiO2)

Quartzite (River Stone)

Quartzite (SiO2)

Anthracite Coal

Anthracite (Carbon-based metamorphic rock, 86-97% C)

Pumice

Pumice (Alveolar Rhyolite / Dacite / Andesite)

Quartz with Iron Stains

Quartz (SiO2) with iron oxide/hydroxide staining

Limestone

Calcium Carbonate (CaCO3)

Quartz Vein in Host Rock

Crystalline Silicon Dioxide (SiO2) in Pelitic or Shaly Matrix

Schist with Biotite Inclusion

Biotite-bearing Mica Schist (K(Mg,Fe)3AlSi3O10(F,OH)2)

Quartzite River Cobble

Quartzite (primarily SiO2)

Limestone

Calcium Carbonate (CaCO3)

Pumice

Pumice (Felsic volcanic rock)

Black Star Diopside (beads)

Diopside (CaMgSi2O6) - a member of the pyroxene group

Milky Quartz

Silicon Dioxide (SiO2)

Ruby (Corundum)

Aluminum Oxide (Al2O3) with Chromium traces

Chalk

Calcium Carbonate (CaCO3)

Diamond

Diamond (pure Carbon, C)

Chert (Yellow Jasper/Flint pebble)

Microcrystalline Quartz (SiO2)

Bixbyite on Rhyolite

Bixbyite (Mn2+,Fe3+)2O3

Smoky Quartz (with Druzy/Polished Edge)

Smoky Quartz (Silicon Dioxide, SiO2)

Anthracite Coal

Anthracite (Carbon-based solid)

Diamond

Carbon (C)

Quartz (Citrine variety)

Silicon Dioxide (SiO2)

Peach Selenite (Satin Spar)

Gypsum (CaSO4·2H2O)

Diamond

Carbon (C)

Diamond

Diamond (pure carbon, C)

Rough Diamond

Diamond (Native Carbon, C)

Diamond

Carbon (C)

Agate

Cryptocrystalline quartz (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Diamond (set in jewelry)

Carbon (C)

Banded Agate

Silicon Dioxide (SiO2)

Gold and Diamond

Native Gold (Au) and Diamond (C)

Agate / Banded Chalcedony

Agate (Silicon Dioxide / SiO2)