Mineral Based Alloy (Anthropogenic)

Moss Agate

Silicon Dioxide (SiO2) with inclusions of hornblende or chlorite

Muscovite (Mica)

Muscovite - KAl2(AlSi3O10)(OH)2

Biotite Mica in Quartz

Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2) in Quartz (SiO2)

Tree Agate (Dendritic Agate)

Silicon Dioxide (SiO2) with Manganese/Iron inclusions

Muscovite Mica

Muscovite - KAl2(AlSi3O10)(OH)2

Biotite / Black Mica

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

Sunstone with Black Tourmaline (Arfvedsonite)

Feldspar (Na,Ca)(Al,Si)4O8 with Schorl Na(Fe3+)3Al6(Si6O18)(BO3)3(OH)3(OH)

Beryl (Emerald or Aquamarine in Matrix)

Beryllium Aluminum Silicate (Be3Al2Si6O18)

Precious Opal

Hydrated amorphous silica (SiO2·nH2O)

Rutilated Quartz

Quartz with Rutile Inclusions (SiO2 with TiO2 inclusions)

Muscovite Mica (with Quartz matrix)

Muscovite - KAl2(AlSi3O10)(OH)2

Fire Agate

Agate (Variety of Chalcedony), SiO2 (Silicon Dioxide)

Precious Opal

Hydrated Silica (SiO2·nH2O)

Muscovite (Mica) in Quartz Matrix

Muscovite (KAl2(AlSi3O10)(OH)2) and Quartz (SiO2)

Basalt Pebble

Basalt (Mafic Igneous Rock)

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Milky Quartz with Chlorite/Iron staining

Silicon Dioxide (SiO2) with inclusions

Gneiss (Metamorphic Rock)

Gneiss

Pegmatite containing Muscovite and Quartz

Granitic Pegmatite (SiO2 with KAl2(AlSi3O10)(OH)2)

Gossan (Iron Hat)

Iron oxide-rich weathered rock (primarily Limonite and Goethite with secondary Quartz)

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide - SiO2)

Bull Quartz (White Quartz)

Silicon Dioxide (SiO2)

Basalt with Vesicular Texture

Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Diorite (Dalmatian Stone)

Intermediate Phaneritic Igneous Rock

Diorite

Diorite

Granite

Phaneritic Plutonic Felsic Rock (KAlSi3O8 - SiO2 - NaAlSi3O8)

Granite

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

Ferruginous Quartz (Iron-stained Quartz)

Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)

Fuchsite

Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)

Fuchsite

K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lithium-bearing Mica)

Muscovite (Mica)

Muscovite - KAl2(AlSi3O10)(OH)2

Dendritic Agate

Dendritic Agate (Silicon Dioxide with Manganese or Iron Oxide inclusions, SiO2)

Biotite Mica

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

Tree Agate

Dendritic Agate (Silicon Dioxide, SiO2)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Biotite Mica

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

Goldstone (Synthetic Aventurescence Glass)

Cuprous Aventurescent Glass (Silicon Dioxide with Copper inclusions)

Granite

Phaneritic Felsic Intrusive Igneous Rock

Mica Schist

Mica Schist (KAl2(AlSi3O10)(OH)2)

Red Sandstone

Clastic sedimentary rock (primarily SiO2 with Fe2O3 iron oxide staining)