Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Category
Anthropogenic (Man Made Material Processed By Nature)
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Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Sandstone (SiO2 dominant)
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Sandstone (likely Quartzose Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Quartzwacke / Impure Sandstone
Arenite with minor lithic fragments (Silicon Dioxide matrix)
sedimentary
Tumbled green aventurine (likely)
Quartz (SiO₂) with fuchsite or other green mica inclusions
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Serpentinite
Serpentinite (Hydrous magnesium iron phyllosilicate)
metamorphic
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite/Arkose)
sedimentary
Sandstone
Arenite
sedimentary
Limestone (River Pebble)
Calcium Carbonate (CaCO3)
sedimentary
Bauxite
Bauxite (Al2O3·nH2O)
sedimentary
Sandstone
Arenite (primarily Quartz, SiO2)
sedimentary
Olivine (Peridotite)
Magnesium iron silicate (Mg, Fe)2SiO4
igneous
Sandstone
Arenite
sedimentary
Sandstone (likely Graywacke or Arkose)
Arenite
sedimentary
Quartzite Pebble
Quartzite (composed primarily of Silica, SiO2)
metamorphic
Sandstone with Tafoni Weathering
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (predominantly SiO2)
sedimentary
Bauxite
Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)
sedimentary
Sandstone (Quartz-rich)
Arenite
sedimentary
Black Onyx
Cryptocrystalline Quartz (SiO2) with carbon/iron impurities
mineral/sedimentary
Vesicular Basalt (Lava Rock)
Vesicular Basalt (comprising plagioclase feldspar and pyroxene group minerals)
igneous
Sandstone
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Green Andesite (or Greenstone / Altered Volcanic Rock)
Intermediate Volcanic Rock with Chlorite/Epidote Alteration
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Calcite
Calcium Carbonate (CaCO3)
mineral
Quartzite (with Mica / Quartzite Schist)
SiO2 (Silica) with minor Muscovite Mica KAl2(AlSi3O10)(OH)2
metamorphic
Tumbled yellow quartz (likely citrine or iron-stained quartz)
Quartz, silicon dioxide (SiO₂); yellow coloration likely from iron impurities
mineral
Native copper nugget
Copper (Cu), commonly with cuprite and copper-oxide alteration
mineral
Blue faceted gemstones, likely blue sapphire
Corundum (Al₂O₃), blue varieties colored chiefly by iron and titanium
gemstone
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Titanium Coated Quartz (Aura Quartz)
Silicon dioxide with titanium vapor deposition (SiO2)
mineral
Smoky Quartz (Tumbled/Water-worn Quartz)
Silicon Dioxide (SiO2)
mineral
Aura Quartz
Silicon Dioxide (SiO2) with metallic vapor coating
mineral
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Blue Sapphire (likely lab-grown or treated)
Corundum (Aluminum Oxide, Al2O3)
gemstone
Smoky Quartz
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities
mineral