Blue Aventurine
Silicon Dioxide (SiO2) containing Dumortierite or Crocidolite inclusions
mineral
Category
Synthetic Or Natural Fiber
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Green Aventurine
Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
mineral
Green Aventurine
Silicon dioxide (SiO2) with Fuchsite inclusions
metamorphic
Green Agate
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Pink Granite
Granite (composed primarily of Quartz, K-Feldspar, and Plagioclase)
igneous
Rough Diamond
Diamond (pure carbon, C)
mineral
Pink Granite
Granite (Phaneritic igneous rock)
igneous
Porphyritic Basalt (Porphyry)
Porphyritic Basalt
igneous
Quartzite Pebbles (River Stones)
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Green Aventurine (Quartz)
SiO2 (Silicon Dioxide with Fuchsite inclusions)
mineral
Green Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions, SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
metamorphic
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Green Aventurine
Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Fairy Stone (Staurolite Concretion)
Staurolite (Fe2+2Al9Si4O23(OH))
metamorphic
Howlite
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Aventurine Quartz
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Granite
Phaneritic Plutonic Felsic Rock (Granite)
igneous
Herkimer Diamond
Quartz (Silica - SiO2)
mineral
Sandstone (likely Quartzose)
Arenite (primarily SiO2)
sedimentary
Smoky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Stream-Rounded Shale or Mudstone
Argillaceous sedimentary rock
sedimentary
Quartz Vein with Iron Staining
Silicon Dioxide (SiO2) with limonite/hematite staining
mineral
Sandstone (Ferruginous)
Arenite with Iron Oxide (Fe2O3) cement
sedimentary
Quartz (Citrine)
Silicon Dioxide (SiO2)
mineral
Quartz Veined Basalt Pebble
Amygdaloidal Basalt with Quartz (SiO2) veining
igneous
Granite
Intrusive Felsic Igneous Rock
igneous
Asphalt (Road Aggregate)
Bituminous Conglomerate / Asphalt Concrete
Anthropogenic (Man-made)
Sandstone
Arenite (SiO2 principal component)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Sandstone (Weathered Coastal Boulder)
Arenite (composed primarily of SiO2)
sedimentary
Ironstone (Limonitic Shale)
Ferruginous Siltstone / Goethite-rich Sedimentary Rock
sedimentary
Fluorite (Polished Point/Tower)
Calcium Fluoride (CaF2)
mineral
Moonstone (Variety of Orthoclase Feldspar)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Eye Agate
Silicon Dioxide (SiO2) - Banded Chalcedony
mineral
Aventurine
Aventurine Quartz (SiO2 + Fuchsite mica)
mineral
Fluorite (Rainbow Fluorite Point)
Calcium Fluoride (CaF2)
mineral
Black Tourmaline
Schorl (Sodium Iron Aluminum Borosilicate Hydroxide), NaFe3Al6(BO3)3Si6O18(OH)4
mineral
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Dyed Pink Quartzite (Jadeite Simulant)
Silicon Dioxide (SiO2) with organic dye
metamorphic