Mineral Based Alloy (Anthropogenic)

Epidote with Quartz

Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Dendritic Agate (also known as Dendritic Siltstone or Mudstone)

Silicon Dioxide with Manganese/Iron Oxide inclusions (SiO2 + MnO2)

Biotite Mica in Host Rock

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

Moss Agate

Chalcedony (Silicon Dioxide / SiO2)

Labradorite

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

Sandstone (Quartzose Sandstone)

Arenite (SiO2)

Mica Schist with Quartz

Crystalline Schist (SiO2 + KAl2(AlSi3O10)(OH)2)

Basalt with Caliche Crust

Aphanitic Mafic Igneous Rock with Calcium Carbonate (CaCO3) coating

Botryoidal Hematite (included in Quartz/Limonite matrix)

Fe2O3 (Hematite) on Quartz (SiO2) / Limonite

Biotite on Matrix

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

Pink Granite

Phaneritic Felsic Igneous Plutonic Rock

Epidote in Basalt

Epidotized Basalt (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH) in Mafic Igneous Host)

Conglomerate

Conglomerate (a clastic sedimentary rock)

Greenstone

Metabasalt / Chlorite Schist

Citrine Quartz

Silicon Dioxide (SiO2)

Bloodstone (Heliotrope)

Silicon Dioxide (SiO2) with inclusions of Iron Oxide

Labradorite

(Ca, Na)(Al, Si)4O8 (Calcium Sodium Aluminum Silicate)

Labradorite

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

Bloodstone

Heliotrope (Chalcedony)

Biotite in Host Matrix

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

Lepidolite

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

Blue Topaz

Al2SiO4(F,OH)2 (Fluorine-bearing aluminum silicate)

Ferruginous Quartz

Silicon Dioxide with Hematite/Limonite impurities (SiO2 + Fe2O3)

Moss Agate

Chalcedony (Silicon Dioxide) with dendritic inclusions (SiO2)

Lepidolite

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

Tree Agate

Silicon Dioxide (SiO2) with inclusions of manganese and iron oxides

Lepidolite

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

Lepidolite

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

Granite Pegmatite with Muscovite Mica

Granite Pegmatite (Silicon Dioxide and complex silicates)

Basalt with Quartz Vein

Basalt (extrusive igneous rock) with Quartz (SiO2) inclusion

Heat-Treated Amethyst (Commercial Citrine)

Silicon Dioxide (SiO2) - Macro-crystalline Quartz

Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Boulder Opal

Precious Opal in Ironstone (Amorphous Hydrated Silica, SiO2·nH2O)

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Grey Chalcedony (Tumbled)

Chalcedony (SiO2)

Fuchsite (Green Muscovite in Quartz)

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

Healer's Gold (Pyrite/Magnetite in Serpentine)

Magnetite (Fe3O4) and Pyrite (FeS2) in Lizardite/Antigorite [Mg3Si2O5(OH)4]

Gneiss with Quartz Veining

Gneiss (High-grade Regional Metamorphic Rock)

Muscovite Schist

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

Basalt with Olivine Phenocrysts

Aphanitic Mafic Volcanic Rock (Basalt)

Basalt

Mafic Igneous Rock

Basalt

Mafic Volcanic Rock (composed of plagioclase, pyroxene, and olivine)