Milky Quartz in Gneiss
Quartzite / Foliated Gneiss containing SiO2
metamorphic
Category
Not A Rock (Man Made Industrial Metal)
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Ironstone Pebble
Sedimentary ironstone / Hematitic Sandstone
sedimentary
Quartz Vein in Siltstone
SiO2 (Quartz) on clastic sedimentary matrix
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Diamond (Baguette cut)
Carbon (C)
gemstone
Quartz Vein
Silicon Dioxide (SiO2)
Mineral
Diamond
Carbon (C)
gemstone
Pallasite Meteorite
Pallasite (Stony-iron meteorite; Fe-Ni alloy with (Mg,Fe)2SiO4 olivine)
Mineral/Extraterrestrial Rock
Serpentinite
Serpentinite (composed largely of serpentine group minerals including antigorite, lizardite, and chrysotile)
metamorphic
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Iron-Stained Quartz/Quartzite
Silicon Dioxide (SiO2) with iron oxides (Limonite/Hematite)
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Pumice
Pumice (Vesicular volcanic glass / Rhyolite or Trachyte)
igneous
Turquoise
Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
Jasper / Chert (Red)
Cryptocrystalline quartz (SiO2)
Sedimentary / Mineral
Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Milky Quartz with inclusions
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Khondalite
Garnet-sillimanite-graphite schist/gneiss
metamorphic
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Native Copper
Native Copper (Cu)
mineral
Pink Granite
Granite (Phaneritic Quartz-Feldspar rock)
igneous
Ferrochrome Slag
Industrial Glassy Slag (Fe-Cr alloy byproduct)
Antropogenic (Man-made industrial byproduct)
Gossan (with Limonite and Hematite)
Gossanous iron-oxide rock (Fe2O3 · nH2O)
sedimentary
Chert (Flint Gravel)
Silicon Dioxide (SiO2)
sedimentary
Diamond (Cut jewelry specimen)
Diamond (pure Carbon, C)
mineral
Collection of Minerals and Ores
Various (e.g., Uraninite (U3O8), Carbon (C), Native Gold (Au), Hematite (Fe2O3), Galena (PbS), etc.)
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Granite
Phaneritic plutonic igneous rock (mainly Quartz, Feldspar, and Mica)
igneous
Titanium Quartz (Aura Quartz)
Silicon Dioxide (SiO2) treated with Titanium
mineral
Diamond
Carbon (C)
mineral
Diamond in Kimberlite
Diamond in Kimberlite Matrix (Diamond: C, Kimberlite: complex Potassic Peridotite)
igneous
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Slate
Metamorphic Pelitic Rock
metamorphic
Serpentinite
Serpentinite (composed primarily of minerals in the Serpentine group)
metamorphic
Slate
Metamorphic Pelitic Rock
metamorphic
Ironstone (Limonite/Goethite Concretion)
Ferruginous Sedimentary Rock (composed of Goethite FeO(OH) and Limonite)
sedimentary
Aquamarine
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral