Mineral (Tectosilicate)

Basalt with Plagioclase Phenocrysts (Porphyritic Basalt)

Porphyritic Basalt (Mafic volcanic rock)

Quartz Vein in Pelite (Metamorphic Rock)

Hydrothermal Quartz Veining in Metasedimentary Rock (SiO2)

Granite

Plutonic felsic igneous rock

Diamond

Diamond (C)

Diamond (in a metal ring setting)

Diamond (Pure Carbon, C)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Chalcedony on Matrix

Silicon Dioxide (SiO2)

Sunstone

Oligoclase (Plagioclase Feldspar subclass), (Ca,Na)(Al,Si)4O8

Ruby in Zoisite

Anyolite (combination of Ca2Al3(SiO4)3(OH) and Al2O3:Cr)

Amethyst (Rough Crystal)

Silicon Dioxide (SiO2 with ferric iron impurities)

Rose Quartz

Silicon Dioxide (SiO2)

Hematite Nodules (Moqui Marbles style)

Iron Oxide (Fe2O3)

Citrine (Heat-treated Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Amethyst Geode

Silicon Dioxide (SiO2) with iron impurities

Jasper with Epidote

Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate (Ca2(Al,Fe)3(SiO4)3(OH))

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Citrine

Quartz (Silicon Dioxide - SiO2)

Quartz (Clear / Rock Crystal)

Silicon Dioxide (SiO2)

Amazonite

Amazonite (KAlSi3O8)

Rough Tanzanite

Zoisite (Ca2Al3(SiO4)3(OH))

Citrine (Heat-treated or Natural Quartz)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Botryoidal Chalcedony (likely Chert or Agatized Coral)

Silicon Dioxide (SiO2)

Sunstone (Oregon Sunstone)

Labradorite (Feldspar variety) - (Ca, Na)(Al, Si)4O8

Limonite Pseudomorph after Pyrite

Goethite/Limonite FeO(OH)·nH2O replacing Pyrite FeS2

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Banded Agate (Chert/Chaldcedony)

Silicon Dioxide (SiO₂)

Ruby Zoisite

Anyolite (Composition of Green Zoisite, Black Tschermakite, and Red Corundum)

Quartz (Citrine or Smoky variant)

Silicon Dioxide (SiO2)

Quartz (Clear/White)

Silicon Dioxide (SiO2)

Oceanside Agate (Orbicular Agate)

Silicon Dioxide (SiO2) - Variety of Chalcedony

Chrysocolla in Quartz (Gem Silica)

Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla) / SiO2 (Quartz)

Amethyst

Amethyst (SiO2 with iron impurities)

Amazonite

K(AlSi3O8) - Microcline variant

Moldavite

Moldavite (Siliceous vitreous substance)

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Amazonite

Potassium aluminum silicate (Microcline); KAlSi3O8

Amazonite (or Amazon Stone)

Potassium Feldspar (Microcline), K(AlSi3O8)

Dyed Agate

Chalcedony (Silicon Dioxide, SiO2)

Clear Quartz

SiO2 (Silicon Dioxide)