Polished fossilized wood (likely petrified wood)
Silicified wood; commonly quartz (SiO₂) replacing wood tissue
fossil
Category
Industrial Byproduct
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Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Yellow Sapphire
Corundum (Al2O3)
gemstone
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Coal
Coal (Combustible sedimentary rock)
sedimentary
Yellow Sapphire
Corundum (Al2O3)
gemstone
Pumice
Vesicular Felsic Extrusive Igneous Rock
igneous
Serpentine / Antigorite
Mg3Si2O5(OH)4 (Serpentine Group)
metamorphic
Quartz with Iron Staining
Silicon Dioxide (SiO2) with Hematite/Limonite inclusions
mineral
Serpentine
Serpentine group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al)2O5(OH)4)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Garnet (Tumbled)
Almandine / Pyrope Garnet (Fe3Al2(SiO4)3 to Mg3Al2(SiO4)3)
mineral
Quartz Pebble (with Hematite Inclusions)
Silicon Dioxide (SiO2)
mineral
Tumbled sodalite (probable)
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂
mineral
Pegmatite with Quartz and Feldspar
Intrusive Igneous Rock
igneous
Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Garnet
Nesosilicate group (e.g., Almandine: Fe3Al2(SiO4)3)
mineral
Anthracite
Anthracite Coal (Carbon)
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Pegmatite
Igneous Pegmatite
igneous
Sapphire
Corundum (Al2O3)
gemstone
Barite Rose
Barium Sulfate (BaSO4)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Limestone (Weathered)
Calcium Carbonate (CaCO3)
sedimentary
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Serpentinite
Serpentinite (composed primarily of serpentine group minerals including antigorite, chrysotile, and lizardite)
metamorphic
Quartz with Iron Oxide
SiO2
mineral
Coal
Carbonaceous sedimentary rock (C)
sedimentary
Satin Spar (often sold as Selenite)
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
mineral
Faceted Quartz (Rock Crystal)
Crystalline Silicon Dioxide (SiO2)
gemstone
Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic
Diamond
C
gemstone
Rough Sapphire (possibly Yellow/Green Corundum)
Corundum (Al2O3)
mineral
Diamond
Carbon (C)
gemstone
Diamond
Carbon (C)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Chert (Red Jasper variant)
Silicon dioxide (SiO2)
sedimentary
Diamond
Natural Diamond (Carbon, C)
gemstone
Diamond (or Cubic Zirconia simulant)
Carbon (C) or Zirconium Dioxide (ZrO2)
mineral
Phyllite
Phyllite (regional metamorphic rock)
metamorphic
Quartzite Pebble
Quartzite (SiO2)
metamorphic