Quartzite
Quartzite (SiO2)
metamorphic
Category
Synthetic (Not A Natural Rock)
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Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Blue Howlite (Dyed)
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Gneiss (Metamorphosed Granitic Rock)
Gneiss (composed mainly of quartz, feldspar, biotite, and/or hornblende)
metamorphic
Sandstone
Arenite (SiO2 dominant)
sedimentary
Quartz-bearing granite or gneiss fragment
Granite/gneiss composed mainly of quartz (SiO₂), feldspar, and minor mica or ferromagnesian minerals
igneous
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium), CuAl6(PO4)4(OH)8·4H2O
mineral
Granite
Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Aquamarine
Beryllium Aluminum Silicate (Be3Al2Si6O18)
gemstone
Tumbled lapis lazuli
Lapis lazuli; predominantly lazurite, (Na,Ca)₈(AlSiO₄)₆(S,SO)₄, with calcite and pyrite
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Emerald In Matrix
Beryl (Be3Al2Si6O18) with trace Chromium/Vanadium
mineral
Chevron Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Pink Granite
Phaneritic intrusive igneous rock (Granite)
igneous
Granite
Granite (Phaneritic Acid Igneous Rock)
igneous
Turquoise
Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O
Mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Green Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2
metamorphic
Granite
Granite
igneous
Pink Dyed Agate
Silicon Dioxide (SiO2) with artificial pigment
sedimentary
Tektite (Indochinite)
Tektite (Amorphous silica glass, SiO2 with impurities)
meteorite
Granite
Granite (phaneritic felsic intrusive rock)
igneous
Clear Quartz Crystal (Rock Crystal)
Quartz (Silicon Dioxide, SiO2)
mineral
Granite
Granite
Igneous
River Stone (likely Basalt or Chert)
Silicon Dioxide (SiO2) for chert or Mafic Extrusive Rock for basalt
igneous/sedimentary
Quartz (Smoky/Druzy variety)
Silicon Dioxide (SiO2)
mineral
Conglomerate
Conglomerate (Sedimentary Clastic Rock)
sedimentary
Granite
Phaneritic Igneous Rock (Granitic)
igneous
Limestone (Porous/Travertine variant)
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Pumice
Pumice (a highly vesicular volcanic rock)
igneous
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Chert / River Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Granite Pebble
Phaneritic plutonic rock (SiO2 primary)
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Granite
Felsic intrusive igneous rock (Granite)
igneous
Green Aventurine
Quartz with Fuchsite inclusions (SiO2)
mineral
Obsidian
Volcanic glass
igneous
Red Sandstone
Quartzose Sandstone (primarily quartz grains cemented by iron oxides)
sedimentary
Green Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2
mineral
Granite Pebble
Granite (Plutonic Igneous Rock)
igneous
River Pebble Gravel
Hydrothermally modified Clastic Sediment (mainly Quartzite and Chert)
sedimentary