Mineral Based Human Made Alloy

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Yellow Chalcedony

Chalcedony (a cryptocrystalline variety of Quartz, SiO₂)

Moss Agate

Silicon Dioxide (SiO2) with Chlorite/Oxide inclusions

Gneiss

Gneiss (Metamorphic rock composed primarily of quartz, feldspar, and mica)

Ferruginous Sandstone (Gozzan/Ironstone)

Arenite with Limonite/Goethite cement (FeO(OH)·nH2O)

Basalt

Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Blue Agate (Dyed)

Silicon Dioxide (SiO2)

Carnelian (Chalcedony)

Silicon Dioxide (SiO2) with trace Iron Oxide

Sandstone

Arenite (primarily SiO2)

Jasper (specifically Red Jasper/Chert)

Silicon Dioxide (SiO2) with iron oxide inclusions

Ocean Jasper

Orbicular Jasper (Silicon Dioxide, SiO2)

Sandstone (with potentially high Feldspar/Arkose content)

Clastic sedimentary rock (SiO2 dominated)

Biotite Mica

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

Mica Schist

Mica Schist (contains Muscovite/Biotite, Quartz)

Basalt with Weathering Crust

Extrusive mafic volcanic rock

Bronzite

Enstatite (var. Bronzite), (Mg,Fe)SiO3

Vesicular Basalt with Xenocrysts

Mafic Igneous Plutonic/Extrusive Complex

Quartz (Iron-stained or Rose variant)

Silicon Dioxide (SiO2)

Banded Chert (Jasper)

Silicon Dioxide (SiO2)

Lepidolite

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

Citrine (likely Heat-Treated Amethyst)

Silicon Dioxide (SiO2)

Peacock Ore

Bornite (Cu5FeS4) or iridescent Chalcopyrite (CuFeS2)

Granitic Sand

Detrital sediment (predominantly Quartz, Feldspar, and Mica)

Howlite

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

Biotite Mica

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

Chrysocolla

Hydrated copper silicates (Cu,Al)2H2Si2O5(OH)4·nH2O

Chert Pebble (Jasper variety)

Microcrystalline Quartz (SiO2)

Basalt with Quartz Veining

Amygdaloidal Basalt (predominately SiO2 and (Na,Ca)(Si,Al)4O8)

River Pebble (Quartzite/Siltstone mixture)

Silicon Dioxide (SiO2) mixture with varied clastic minerals

Lepidolite

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

Chalcedony (Tumbled)

Silicon Dioxide (SiO2)

Chert (Arrowhead Preform or Flake)

Microcrystalline Quartz (SiO2)

Granite

Intrusive igneous felsic rock

Rutilated Quartz

Quartz with Rutile inclusions (SiO2 with TiO2 inclusions)

Moss Agate

Silicon dioxide (SiO2) with inclusions of hornblende or chlorite

Garden Quartz (Phantom Quartz)

Silicon Dioxide (SiO2) with various inclusions (often Chlorite, Hematite, or Iron)

Lepidolite

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

Beryl (Aquamarine) in Matrix with Schorl

Be3Al2Si6O18 (Beryl) with NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)

White Topaz

Topaz - Al2SiO4(F,OH)2

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)

Fuchsite

Chrome-bearing Muscovite [K(Al,Cr)2(AlSi3O10)(OH)2]

Lepidolite

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