Mineral Based Alloy (Anthropogenic)

Granodiorite

Granodiorite (containing Quartz, Plagioclase Feldspar, Biotite, and Hornblende)

Granodiorite

Granodiorite (intermediate intrusive igneous rock)

Granodiorite / Granite

Granodiorite (containing Quartz SiO2, Plagioclase Feldspar, and Biotite)

Mica Schist

Mica Schist (primarily Muscovite and Quartz composition)

Serpentine

Antigorite, Lizardite, or Chrysotile; (Mg, Fe)3Si2O5(OH)4

Lepidolite

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

Basalt (Amygdaloidal)

Amygdaloidal Basalt

Mica Schist

Muscovite/Biotite Schist

Citrine (Heat-Treated Amethyst)

Silicon Dioxide (SiO2)

Chalcedony (Botryoidal or Agate nodule)

Silicon Dioxide (SiO2)

Epidote

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

Mica Schist

Mica Schist (Composition: Muscovite, Biotite, Quartz, Feldspar)

Mica Schist

Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3AlSi3O10(OH)2 mixed with SiO2)

Granite

Granite (composed primarily of Quartz SiO2, Alkali Feldspar, and Plagioclase Feldspar)

Basalt with Epidote

Mafic volcanic rock with Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Basalt with Iron Oxidation

Vesicular Basalt (Aphanitic Mafic Igneous Rock)

Mica (Lepidolite or Muscovite)

Phyllosilicate mineral (KAl2(AlSi3O10)(OH)2 for Muscovite)

Composite Turquoise or Reconstituted Turquoise with Copper inclusions

CuAl6(PO4)4(OH)8·4H2O (Turquoise) mixed with matrix and copper/bronze flakes

Quartz with Hematite Inclusions

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)

Blue Topaz

Topaz [Al2SiO4(F,OH)2]

Labradorite

Labradorite (Ca,Na)(Al,Si)4O8

Blue Sapphire

Corundum (Al2O3 with iron and titanium trace elements)

Biotite (Black Mica)

K(Mg,Fe)3AlSi3O10(OH,F)2

Kaolinite (Kaolin)

Kaolinite (Al2Si2O5(OH)4)

Quartzite with Iron Inclusions

Metamorphosed Quartz Sandstone (SiO2 with Fe2O3)

Dalmatian Jasper

Peralkaline Quartz Feldspar Porphyry

Citrine (Heat-treated)

Silicon Dioxide (SiO2)

Labradorite (Feldspar)

Labradorite, (Ca,Na)(Al,Si)4O8

Bloodstone (Heliotrope)

Silicon Dioxide (SiO2) with iron silicate and iron oxide inclusions

Bloodstone (Heliotrope)

Silicon dioxide (SiO2) with iron oxide inclusions

Garnetiferous Quartzite (Garnet Gneiss Pebble)

Garnet-bearing Quartzite or Quartz-Feldspar Gneiss

Biotite (Black Mica)

Biotite (K(Mg,Fe++)3AlSi3O10(OH,F)2)

Granite

Granite (Felsic Plutonic Rock)

Granite

Granite

Granite

Felsic Plutonic Rock (primarily Quartz, Potassium Feldspar, and Plagioclase)

Concrete Rubble with Aggregate

Hardened Portland Cement Paste with Coarse Aggregate

Cobalt Blue Sea Glass

Amorphous Silica Glass (SiO2 + CoO)

Sandstone (Quartz Arenite)

Sandstone (SiO2 with possible mineral cements)

Diorite

Diorite

Dzi Bead (Agate)

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Lepidolite

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

Muscovite Mica Schist

Muscovite Schist (KAl2(AlSi3O10)(OH)2)