Bull Quartz with Mica and Host Rock
Massive Quartz (SiO2) with Muscovite/Chlorite inclusions
igneous
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Quartzite with inclusions
Metamorphic Rock (Mainly SiO2)
metamorphic
Marble
Recrystallized Calcite / Metamorphosed Limestone (CaCO3)
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary
Dark-colored Igneous Rock (likely Basalt or Diabase)
Basalt (extrusive igneous) or Diabase (intrusive igneous)
Igneous Rock
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Banded Agate
Cryptocrystalline Quartz (SiO2)
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
gemstone
Amethyst on Agate
Crystalline Quartz (SiO2) with trace Iron (Fe3+)
mineral
Amazonite
K(AlSi3O8) - Potassium Aluminum Silicate (variety of Microcline)
mineral
Black Opal
Hydrated Amorphous Silica (SiO2 "n" H2O)
gemstone
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Grape Agate
Botryoidal Amethystine Chalcedony (SiO2)
mineral
Amazonite
Amazonite (KAlSi3O8)
mineral
Amazonite
Microcline-type Feldspar (KAlSi3O8)
mineral
Chrysocolla (in Host Rock)
Hydrated copper silicate - Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O
mineral
Aquamarine (Beryl)
Beryl (Be3Al2Si6O18 with Fe impurities)
mineral
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Geode (Unopened)
Chalcedony Geode (Hydrated Silicon Dioxide, SiO2)
sedimentary
Emerald
Beryl (Be₃Al₂(SiO₃)‑₆) with Chromium/Vanadium impurities
mineral
Ruby in Zoisite
Anyolite (combination of Ca2Al3(SiO4)3(OH) and Al2O3:Cr)
metamorphic
Amethyst
Quartz (Silicon Dioxide, SiO2)
mineral
Hematite Nodules (Moqui Marbles style)
Iron Oxide (Fe2O3)
mineral
Sunstone
Oligoclase (Plagioclase Feldspar subclass), (Ca,Na)(Al,Si)4O8
mineral
Amethyst (Rough Crystal)
Silicon Dioxide (SiO2 with ferric iron impurities)
mineral
Biotite on Quartz Matrix
Biotite - K(Mg,Fe)3(AlSi3O10)(OH,F)2 with Quartz (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Jasper with Epidote
Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate (Ca2(Al,Fe)3(SiO4)3(OH))
sedimentary
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Mineral
Moonstone
Orthoclase (Potassium Aluminum Silicate, KAlSi3O8) with inclusions of Albite
mineral
Botryoidal Chalcedony (likely Chert or Agatized Coral)
Silicon Dioxide (SiO2)
mineral
Sunstone (Oregon Sunstone)
Labradorite (Feldspar variety) - (Ca, Na)(Al, Si)4O8
mineral
Quartz (Clear / Rock Crystal)
Silicon Dioxide (SiO2)
Mineral
Amethyst
SiO2 (Silicon Dioxide with iron impurities)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Amazonite
Amazonite (KAlSi3O8)
mineral
Rough Tanzanite
Zoisite (Ca2Al3(SiO4)3(OH))
mineral
Limonite Pseudomorph after Pyrite
Goethite/Limonite FeO(OH)·nH2O replacing Pyrite FeS2
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Oceanside Agate (Orbicular Agate)
Silicon Dioxide (SiO2) - Variety of Chalcedony
mineral
Citrine (Heat-treated or Natural Quartz)
Silicon Dioxide (SiO2)
mineral