Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Bauxite
Hydrated Aluminum Oxides (primarily Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Diaspore α-AlO(OH))
sedimentary
Muscovite Mica (with Schist)
Muscovite - KAl2(AlSi3O10)(OH)2
metamorphic
Celestite (Celestine)
Strontium sulfate (SrSO4)
mineral
Celestite
Celestine (Strontium Sulfate, SrSO4)
mineral
Almandine Garnet in Schist
Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist
metamorphic
Basalt
Africite (Mafic Igneous Rock)
igneous
Quartz Druzy on Basalt
Silicon Dioxide (SiO2) on Mafic Volcanic Rock
Mineral on Igneous Rock
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Granite River Rock
Phaneritic Felsic Igneous Rock (Granite)
igneous
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 cement)
sedimentary
Almandine Garnet in Matrix
Almandine, Fe3Al2(SiO4)3
metamorphic
Jasper
Silicon dioxide (SiO2)
sedimentary
Flint (within Limestone matrix)
Silicon dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Tiger's Eye (likely Hawk's Eye variant)
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Tiger's Eye (Tumbled Blue/Black-Golden variety)
Pseudomorph of Quartz after Crocidolite (SiO2 with Iron inclusions)
metamorphic
Tiger Iron
Tiger Iron (Hematite, Red Jasper, and Chert/Tiger's Eye composite)
metamorphic
Rose Quartz
SiO2 (Silicon Dioxide)
mineral
Amethyst (Chevron Amethyst/Dream Amethyst)
Silicon Dioxide (SiO2) with trace Iron impurities
mineral
River Rock (Greywacke/Siltstone)
Siltstone / Argillaceous Greywacke
sedimentary
Chert (specifically Zebra Chert/Flint)
Silicon Dioxide (SiO2)
sedimentary
Fancy Jasper
Silicon Dioxide (SiO2)
mineral
Red Jasper
Jasper (Silica/Silicon Dioxide, SiO2 plus iron inclusions)
sedimentary
Banded Iron Formation (BIF)
Banded Iron Formation (predominantly Hematite Fe2O3 and magnetite Fe3O4 alternating with Chert SiO2)
sedimentary
Red Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic
Basalt (River Stone)
Mafic volcanic rock
igneous
Diamond
Diamond (C)
mineral
Blue Sapphire
Corundum (Al2O3)
mineral
Greenstone
Greenschist / Greenstone (containing Chlorite, Epidote, Actinolite)
metamorphic
Obsidian
Volcanic Glass (70-75% SiO2)
igneous
Quartz Crystal with Inclusions
Silicon Dioxide (SiO2)
mineral
Amber
Succinite
Organic Mineraloid
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Opal
Hydrated Amorphous Silica (SiO2·nH2O)
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Yellow Jade (Nephrite or Quartzite)
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jade-colored Quartzite (SiO2)
metamorphic
Lapis Lazuli
Lazurite-rich metamorphic rock (complex silicate)
metamorphic
Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Fluorite
Calcium Fluoride (CaF2)
mineral