Amethyst
Quartz (Silicon Dioxide with iron impurities), SiO2
mineral
Category
Mineral (Biogenic)
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Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Chrysocolla
Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·n(H2O)
mineral
Septarian Nodule
Septarian Concretion (Calcium Carbonate/Aragonite/Calcite)
sedimentary
Amazonite
Potassium aluminum silicate (KAlSi3O8)
mineral
Amethyst (Tumbled)
Purple Quartz (SiO2 with iron impurities and irradiation)
mineral
Carnelian
Carnelian (Silicon Dioxide, SiO2)
mineral
Raw Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Druzy Quartz on Milky Quartz
Silicon Dioxide (SiO2)
mineral
Iron Slag (Industrial Byproduct)
Anthropogenic Vitrification Product/Ferrous Slag
Mineral-like Industrial Smelting Waste
Labradorite (Dark Matrix)
Plagioclase Feldspar ((Ca, Na)(Al, Si)4O8)
mineral
Quartz (Amethyst variety)
Silicon Dioxide (SiO2)
mineral
Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Opal (Precious Opal)
Hydrated Silica (SiO2·nH2O)
mineral
Chalcedony Geode Fragment
Silicon Dioxide (SiO2)
mineral
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Green Aventurine
Silicon dioxide (SiO2) with fuchsite inclusions
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2 with Iron impurities)
mineral
Black Onyx
Silicon Dioxide (SiO2) - Chalcedony variant
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Amethyst (Geode/Druzy)
Silicon Dioxide (SiO2) with iron impurities
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Rose Quartz
Quartz (Silicon Dioxide) - SiO2
mineral
Ruby in Zoisite
Anyolite (Zoisite with Corundum) Member of the Epidote Group
metamorphic
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Jasper (specifically Yellow/Red Jasper)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Ironstone Concretion
Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Desert Rose
Gypsum (CaSO4·2H2O) or Barite (BaSO4) inclusions in sand
mineral
Amethyst (Cabochon)
Silicon Dioxide (SiO2) with iron impurities
mineral
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Amethyst Quartz
Silicon Dioxide (SiO2)
mineral
Aventurine Quartz
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Jasper (likely Polychrome or Ocean Jasper)
Silicon Dioxide (SiO2) with impurities
sedimentary
Amazonite
Amazonite (K(AlSi3O8))
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Flower Agate (Cherry Blossom Agate)
Chalcedony (SiO2) with Opaque Inclusions
mineral
Red Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with Fe2O3 inclusions)
metamorphic
Amazonite
Potassium Feldspar (KAlSi3O8)
mineral
Mookaite Jasper
Silicified Radiolarite (SiO2)
sedimentary
Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Mineral