Common Green Opal
Hydrated amorphous silicon dioxide (SiO2·nH2O)
mineral
Category
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Vesicular Basalt
Basalt with vesicular texture
igneous
Tree Agate
Dendritic Agate (Silicon Dioxide, SiO2)
mineral
Quartz in Limonite-rich Matrix
Silicon Dioxide (SiO2) with Goethite/Limonite FeO(OH)·nH2O
Mineral in Sedimentary/Secondary host
Red Jasper
Silicon Dioxide (SiO2)
sedimentary
Amethyst Quartz with Matrix
Silicon Dioxide (SiO2)
mineral
Manganese Dendrite on Siltstone
Manganese Oxide (pyrolusite or psilomelane) Dendrites
mineral/sedimentary
Red Quartz (Carnelian/Red Jasper Agate)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Amethyst
SiO2 (Silicon Dioxide with iron impurities)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Amazonite
Potassium aluminum silicate (Microcline); KAlSi3O8
mineral
Amazonite
Tectosilicate Microcline (KAlSi3O8)
mineral
Amazonite
Potassium Feldspar (Microcline), K(AlSi3O8)
mineral
Tumbled Carnelian and Quartz Mix
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Gold in Quartz Matrix
Native Gold (Au) with Quartz (SiO2) and Slate/Shale
mineral
Carnelian
Carnelian (a variety of Chalcedony), SiO2 (Silicon Dioxide)
mineral
Carnelian
Carnelian (SiO2)
mineral
Granite (Weathered)
Grano-diorite / Granite (SiO2 rich intrusive rock)
igneous
Sandstone (with Limonite staining)
Arenite (primarily SiO2 with FeO(OH)·nH2O)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Pink Quartzite
Metamorphosed Quartz Arenite (SiO2)
metamorphic
Shale
Fissile Mudrock (Clay-rich Sedimentary Rock)
sedimentary
Quartzite
Metamorphic Rock (Mainly SiO2)
metamorphic
Baryte (Barite)
Barium sulfate (BaSO4)
mineral
Quartz Geode (with Calcite influence)
Silicon Dioxide (SiO2) with possible Calcium Carbonate (CaCO3)
mineral
Glauconite (Greensand)
(K, Na)(Fe3⁰, Al, Mg)₂(Si, Al)₄O₁₀(OH)₂
sedimentary
Peridot
Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Yellow Quartz (Citrine or Iron-Stained Quartz)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz-veined Mudstone or Argillite
SiO2 (Quartz) in Siltstone/Mudstone matrix
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Chalcedony in Limestone Host Rock
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
Mineral within Sedimentary Rock
Carnelian Agate (with Quartz/Chalcedony)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Labradorite
(Ca, Na)(Al, Si)4O8
mineral
Gneiss
Gneiss
metamorphic
Serpentine
Serpentine group ((Mg, Fe)3Si2O5(OH)4)
metamorphic
Blue Lace Agate
Chalcedony (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Epithermal Gold Ore (in Quartz/Rhyolite matrix)
Auriferous Quartz (Au + SiO2)
mineral