Antropogenic (Man Made Industrial Byproduct)

Bauxite

Bauxite (Al(OH)3 mixed with Fe2O3 and clay minerals)

Almandine Garnet

Almandine (Fe3Al2Si3O12)

Marble

Recrystallized Calcite / Dolomite (CaCO3)

Granodiorite

Granodiorite (Intermediate intrusive igneous rock)

Granitoid (Granitic Rock)

Granitoid (Quartzo-feldspathic plutonic rock)

Smoky Quartz

Silicon Dioxide (SiO2)

Quartzite

Quartzite (primarily Silicon Dioxide, SiO2)

Vesicular Basalt (Scoria)

Extrusive Mafic Volcanic Rock (FeO-SiO2-MgO)

Milk Quartz (Tumbled)

Silicon Dioxide (SiO2)

Ruby

Corundum (Aluminium Oxide with Chromium impurities, Al2O3:Cr)

Banded Iron Formation

Banded Iron Formation (BIF)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals, (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)

Serpentine

Serpentinite (complex of Mg, Fe, Ni, Al, Zn, Mn)Si2O5(OH)4

Banded Agate (specifically Sardonyx)

Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz

Serpentinite

Serpentinite (containing minerals of the Serpentine subgroup: Antigorite, Lizardite, and Chrysotile; formula (Mg,Fe)3Si2O5(OH)4)

Rose Quartz

Silicon Dioxide (SiO2)

Olivine (Peridot when gem-quality)

Magnesium Iron Silicate, (Mg,Fe)2SiO4

Dragon Vein Agate

Silicon Dioxide (SiO2)

Rhodolite Garnet

Magnesium Aluminum Silicate; formula: (Mg,Fe)3Al2(SiO4)3

Milky Quartz with Mineral Inclusions

Silicon Dioxide (SiO2)

Diamond (set in Gold)

Diamond (pure carbon, C)

Diamond (Green tinted)

Carbon (C) with trace impurities or lattice defects

Quartz

Quartz (SiO2 - Silicon Dioxide)

Kyanite (Blue or Blue-Grey)

Kyanite (Al2SiO5)

Sandstone

Arenite (primarily Quartz, SiO2)

Magnetite (Lodestone variety)

Magnetite (Iron(II,III) oxide, Fe3O4)

Anthracite Coal

Anthracite (Carbon-based solid)

Basalt

Extrusive Mafic Igneous Rock (composed primarily of plagioclase, pyroxene, and olivine)

Quartzite (River Cobble)

Quartzite (SiO2)

Granite

Plutonic felsic igneous rock

Diamond (faceted)

Diamond (Pure Carbon, C)

White Howlite

Howlite (Calcium borosilicate hydroxide, Ca2B5SiO9(OH)5)

Veined Pebble (likely a Quartz-Veined Pebble)

Pebble with Mineral Vein (e.g., Quartz Vein in a Chert/Mudstone Pebble)

Red Garnet

Almandine and Pyrope (Silicate minerals: Fe3Al2(SiO4)3 and Mg3Al2(SiO4)3)

Quartz (Granular Milky Quartz fragment)

Silicon Dioxide (SiO2)

Milky Quartz with Mineral Inclusions

Quartz (Silicon Dioxide, SiO2)

Ruby

Corundum (Al2O3 with Chromium traces)

Quartzite

Quartzite (primarily SiO2)

Quartz (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Beach Quartzite (Yellow-stained Quartz)

Quartzite (SiO2 with Iron oxide staining)

Aragonite Star Cluster (or Aragonite Sputnik)

Aragonite (Orthorhombic Calcium Carbonate, CaCO3)