Mineral Based Alloy (Anthropogenic)

Muscovite Mica Schist

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

Dzi Bead (Agate)

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Granite

Granite (phaneritic intrusive igneous rock)

Pink Granite (with Potassic Feldspar and Quartz)

Felsic Intrusive Igneous Rock (Granite)

Milky Quartz with Chlorite Schist Inclusions

Quartz (SiO2) with Chlorite Group silicates (typically (Mg,Fe)3(Si,Al)4O10(OH)2)

Granite

Granite (Alkali-feldspar granite)

Fossilized Shark Tooth

Fossilized Elasmobranchii tooth (likely Odontaspis or Carcharias)

Rough Green Sapphire (Corundum)

Corundum (Al2O3 - Aluminum Oxide with trace elements)

Mica

Phyllosilicate (group name), typically Muscovite KAl2(AlSi3O10)(OH)2 or Biotite K(Mg,Fe)3(AlSi3O10)(OH)2

Blue Topaz

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

Precious Opal

Hydrated Silica (SiO2·nH2O)

Citrine

SiO2 (Silicon Dioxide)

Schist

Mica Schist

Dalmatian Stone (Dalmatian Jasper)

Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite

Lepidolite

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

Sandstone Pebble

Arenite (Clastic Sedimentary Rock)

Basalt with Weathered Crust

Aphanitic Mafic Igneous Rock (Basalt)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Schist

Schist (primarily mica-schist)

Schist

Mica Schist (predominantly Muscovite/Biotite)

Muscovite Mica

Muscovite [KAl2(AlSi3O10)(OH)2]

Ironstone (with possible Hematite/Limonite coating)

Ironstone (Fe-rich sedimentary rock)

River Cobble (Sandstone)

Arenite (primarily SiO2)

Quartz with Schist Inclusion

Crystalline Silicon Dioxide (SiO2) with Muscovite/Biotite Schist

Garden Quartz (Lodolite)

Quartz with inclusions (SiO2 + various inclusions such as Chlorite, Hematite, or Feldspar)

Coarse Sandstone Pebble

Clastic Sedimentary Rock (Sandstone)

Lepidolite

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

Granite

Phaneritic plutonic rock (primarily Quartz, Feldspar, and Mica)

Gneiss (Pebble)

Gneiss

Granite

Phaneritic plutonic rock (Quartz, Feldspar, Mica)

Granite

Granite (High-silica plutonic rock)

Schist

Mica Schist (primarily Muscovite and Biotite)

Sandstone with Iron Oxide Staining

Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)

Vesicular Basalt

Aphanitic Mafic Volcanic Rock

Dyed Aura Quartz

Silicon Dioxide (SiO2) with metallic coating

Mica Schist

Crystalline Schist (often containing Muscovite, Biotite, and Quartz)

Gneiss

Gneiss

Quartz with Muscovite Mica

Silicon Dioxide (SiO2) with Potassium aluminum silicate hydroxide fluoride [KAl2(AlSi3O10)(F,OH)2]

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Lepidolite

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

Glauconite (Green Sandstone)

Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2

Granite

Granite (composed primarily of Quartz SiO2, Feldspar KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8, and Mica)