Metamorphic Rock (Primarily Composed Of Minerals)

Granitic Gravel Piece

Granite (Felsic Plutonic Rock / SiO2 with Al2O3, K2O, Na2O)

Quartzite Pebble

Quartzite (SiO2 with minor impurities)

Quartzite Pebble

Quartzite (SiO2)

Emerald in Matrix

Beryl (Be3Al2Si6O18) containing Chromium/Vanadium impurities

White Quartz

Silicon Dioxide (SiO2)

Jadeite

NaAlSi2O6 (Sodium Aluminum Silicate)

Milky Quartz

Silicon Dioxide (SiO2)

Massive Quartz (Milky or Gray)

Silicon Dioxide (SiO2)

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Quartz (Water-worn pebble)

Silicon Dioxide (SiO2)

Green Aventurine

Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Shale

Lutaceous sedimentary rock

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone (Quartz-rich)

Arenite (primarily SiO2)

Quartz / Rock Crystal

Silicon Dioxide (SiO2)

Copper Ore (with Malachite and Azurite)

Hydroxide copper carbonate (Cu2CO3(OH)2 / Cu3(CO3)2(OH)2)

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Black Spinel

Magnesium Aluminum Oxide (MgAl2O4)

Hematite

Iron(III) oxide (Fe2O3)

Pink Stained Rock (Likely Quartzite or Sandstone with Iron Oxide Staining)

Quartzite (metamorphic) or Sandstone (sedimentary); coloration likely due to hematite or other iron oxides.

Granite Pebble (Salt and Pepper Granite)

Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Biotite/Amphibole)

Clear Quartz

Silicon Dioxide (SiO2)

Granite

Phaneritic Plutonic Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)

Apatite

Fluorapatite, Chlorapatite, and Hydroxylapatite (Ca5(PO4)3(F,Cl,OH))

Quartzite (or Milky Quartz pebble)

Quartzite (primarily Silicon Dioxide, SiO2)

Specular Hematite

Hematite (Fe2O3)

Granite (with alteration)

Granite (Felsic intrusive igneous rock)

Diamond in Kimberlite

Kimberlite host rock with C (Carbon) inclusion

Orange Quartzite (or Aventurine Quartz)

Quartzite (primarily SiO2 with Hematite or Goethite inclusions)

Milky Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Pink Granite

Phaneritic plutonic igneous rock (Alkali-feldspar granite)

Ferromanganese Nodule

Polymetallic Nodule (composed primarily of MnO2 and Fe2O3)

Red Sandstone

Arenite (composed primarily of SiO2 with Fe2O3 cementation)

Coquina / Fossiliferous Limestone

Coquina (composed primarily of Calcium Carbonate / CaCO3)

Gold-bearing Quartz with Iron Oxides

Quartz (SiO2) with Limonite/Goethite (FeO(OH)) and Pyrite (FeS2)

Pearl and Garnet Glass

Calcium Carbonate (CaCO3) for pearl; Silicon Dioxide (SiO2) for glass

Quartz

Silicon Dioxide (SiO2)

Rhodonite

Rhodonite (Mn,Fe,Mg,Ca)SiO3

Amygdaloidal Basalt with Secondary Minerals

Basalt containing secondary mineralization (likely Chlorite, Celadonite, or Zeolites)

Quartz (specifically Milky or Clear Quartz)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)