Blue Chalcedony (likely dyed)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Category
Mineralogical Specimen
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Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Rose Quartz
Silicon dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Hypersthene
Enstatite (Hypersthene variety), (Mg,Fe)SiO3
mineral
Carnelian Agate
Chalcedony (SiO2) with iron oxide inclusions
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Eclogite
Eclogite (composed primarily of Omphacite and Pyrope Garnet)
metamorphic
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Amygdaloidal Basalt
Basalt with secondary mineral infilling (commonly Zeolite, Calcite, or Quartz)
igneous
Herkimer Diamond
Quartz (SiO2)
mineral
Clear Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Rose Quartz (SiO2 with inclusions of Dumortierite)
mineral
Quartz / Clear Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz with inclusions
Silicon Dioxide (SiO2)
mineral
Amethyst (Chevron Amethyst)
Amethystine Quartz (SiO2)
mineral
Tiger's Eye (Brown/Dark variety)
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)
metamorphic
Amethyst
Silicon Dioxide with Iron impurities (SiO2)
mineral
Quartz Geode
Crystalline Quartz (Silicon Dioxide, SiO2)
mineral
Moonstone
Orthoclase Feldspar ((K,Na)AlSi3O8)
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Calcite in Matrix
Calcium Carbonate (CaCO3) on Sedimentary Host Rock
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Chevron Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
mineral
K2 Stone (or K2 Jasper)
Azurite-in-Granite (Potassium Feldspar, Quartz, Plagioclase, Muscovite, and Azurite)
igneous
Amethyst
Amethyst (Silicon Dioxide, SiO2 with Iron impurities)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions (Hematite/Goethite)
mineral
Labradorite
(Ca, Na)(Al, Si)4O8
mineral
Kambaba Jasper
Stromatolite / Fossilized Algae (Rhyolitic structure)
sedimentary
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
mineral
Jasper Breccia
Silicon Dioxide (SiO2) with impurities
sedimentary
Blue Lace Agate
Silicon Dioxide (SiO2) - Variety of Chalcedony
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Bumblebee Jasper
Fossiliferous Volcanic Rock (composed of Calcium Carbonate, Manganese Oxides, and Arsenic Sulfides)
igneous
Clear Quartz
SiO2 (Silicon Dioxide)
mineral
Yooperlite (Sodalite-rich Syenite)
Sodalite-bearing Syenite
igneous