Man Made Byproduct (Often Mistaken For Obsidian Or Emerald)

Jasper

Chert (Silica: SiO2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Calcite (Optical Grade/Iceland Spar)

Calcium Carbonate (CaCO3)

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lithium-bearing Mica)

Serpentinite

Serpentinite (Mg, Fe, Ni)₃Si₂O―(OH)₄

Satin Spar Selenite

Gypsum (CaSO4·2H2O)

Rhodonite beads (possibly dyed or treated, or lower quality Rhodonite)

Manganese inosilicate, (Mn,Fe,Mg,Ca)SiO3

Moss Agate

Chalcedony (Silicon Dioxide, SiO2) with inclusions

Rhodonite

Rhodonite (Manganese Iron Magnesium Calcium Silicate) - (Mn,Fe,Mg,Ca)SiO3

Yellow Quartzite (Onyx Pebble)

Silicon Dioxide (SiO2) - Quartzite

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Picture Jasper

Silicon Dioxide (SiO2) with impurities

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Pyrite (Iron Pyrites)

Iron Sulfide (FeS2)

Citrine

Silicon Dioxide (SiO2)

Massive Quartz (Yellow/Citrine variety)

Silicon Dioxide (SiO2)

Quartzite Pebble

Quartzite (primarily SiO2)

Rose Quartz

Silicon Dioxide (SiO2)

Green Chert (Jasper)

Silicon Dioxide (SiO2)

Chert

Microcrystalline Quartz (SiO2)

Bloodstone Jasper (Heliotrope)

SiO2 (Silicon Dioxide) - Cryptocrystalline Quartz

Pink Amethyst Geode

Silicon Dioxide (SiO2) with Hematite/Iron impurities

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement

Sandstone

Arenite (composed primarily of SiO2)

Yellow Quartz (Chalcedony/Citrine Pebble)

Silicon Dioxide (SiO2)

Sugilite

KNa2(Fe,Mn,Al)2Li3Si12O30 (Potassium Sodium Lithium Iron Manganese Aluminum Silicate)

Serpentine (Greenstone)

Antigorite, Lizardite, and Chrysolite mixture (Mg3Si2O5(OH)4)

Milky Quartz

Silicon Dioxide (SiO₂)

Quartzite

Quartzite (SiO2)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Banded Iron Formation (BIF) / Tiger Iron

Ferruginous Chert (primarily Quartz [SiO2] and Hematite/Magnetite [Fe2O3/Fe3O4])

River Cobble (Quartzite-rich Sandstone)

Clastic Sedimentary Rock (Litharenite/Quartzite transition)

Greenstone

Protolith of basalt, diabase, or gabbro; often contains minerals like chlorite, actinolite, and epidote

Sandstone (Red Sandstone)

Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide)

Chert (Pink Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 oxides)

Quartzite

Quartzite (SiO2)

Chert (with Chalky Cortex)

Silicon Dioxide (SiO2)