Mineral Based Alloy (Anthropogenic)

Titanium-Coated Hematite (Aura Hematite)

Titanium-bonded Hematite (Fe2O3 with a Ti coating)

Anthracite Coal

Anthracite (Carbon-based metamorphic rock, 86-97% C)

Anthracite Coal

Anthracite (Carbon-based sedimentary rock typically classified as metamorphic)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Orca Agate (Blue Chalcedony)

Silicon Dioxide (SiO2)

Fuchsite (Chrome Mica)

K(Al,Cr)2(AlSi3O10)(OH)2

Vesicular Basalt with Lichen

Vesicular Basalt

Lepidolite on Pegmatite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2) in Granitic Pegmatite

Epidote

Epidote (Ca2(Al,Fe)3(SiO4)3(OH))

Sandstone Concretion

Clastic sedimentary rock (primarily Quartz SiO2 with mineral cement)

Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Chalcedony Geode Fragment

Silicon Dioxide (SiO2)

Granite

Granite (composed primarily of Quartz, Feldspar, and Mica)

Diorite

Diorite (intermediate intrusive igneous rock)

Basalt

Basalt

Granite

Phaneritic plutonic rock (SiO2 + Al2O3)

Limestone Gravel

Calcium Carbonate (CaCO3)

Limestone with Calcite Crust

Sedimentary Calcium Carbonate (CaCO3)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic volcanic rock)

Slag Glass

Vitreous Silicate Residue

Epidote

Epidote (Ca2(Al, Fe)3(SiO4)3(OH))

White Topaz

Al2SiO4(F,OH)2

Blue Topaz

Al2SiO4(F,OH)2

River Cobble (Mixed Lithology)

Clastic Sedimentary Rock (Silicified Siltstone or Wacke)

Muscovite Mica (Granitic Pegmatite)

Muscovite - KAl2(AlSi3O10)(OH)2

Dragon Blood Jasper (Epidote with Piedmontite or Quartz)

Epidote-rich Quartzite / SiO2 with (Ca2(Al2,Fe)(Si2O7)(SiO4)O(OH))

Citrine (Heat-Treated Amethyst)

Silicon Dioxide (SiO2)

Dyed Blue Agate

Silicon Dioxide (SiO2) with artificial pigment

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Granite

Granite (composed primarily of Quartz, Feldspar, and Mica)

Blue Topaz (facetted in jewelry)

Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)

Granite Sand (Decomposed Granite)

Grus / Quartz-Feldspar Detritus

Citrine

Crystalline Quartz (SiO2) with iron impurities

Quartz with Mica inclusions (Pegmatite)

Silicon Dioxide (SiO2) with Muscovite/Biotite inclusions

White Topaz

Al2SiO4(F,OH)2 (Aluminium Silicate Fluoride Hydroxide)

Howlite

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

Bloodstone

Heliotrope (Cryptocrystalline Quartz, SiO2)

Sandstone (with banding)

Arenite (primarily SiO2)

Basalt with Porphyritic Texture

Porphyritic Basalt

Vesicular Basalt with Siltstone

Mafic Volcanic Rock (Basaltic Composition)

Quartz Vein in Host Rock (Gabbro or Basalt)

Silicon Dioxide (SiO2) with Mafic Silicates

Granite

Felsic Plutonic Rock