Jasper
Silicon dioxide (SiO2)
sedimentary
Category
Organic Gemstone (Fossilized Resin)
Browse organic gemstone (fossilized resin) specimens identified by the Rock Identifier community.
Tiger's Eye
SiO2 (Silicon Dioxide with Iron Oxide inclusions)
Mineral (Metamorphic pseudomorph)
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
mineral
Jasper (likely Polychrome or Mookaite variants)
Silicon Dioxide (SiO2) with iron oxide and hydroxide inclusions
sedimentary (chemically precipitated)
Carnelian
Carnelian (Silicon Dioxide - SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2 + Fe)
mineral
Larimar
Pectolite (Blue variety), NaCa2Si3O10(OH)
mineral
Nuummite
Nuummite (Orthoamphibole rock / Anthophyllite-Gedrite blend)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Nuummite
Nuummite (Ortho-amphibole rock, primarily Anthophyllite and Gedrite)
metamorphic
Chrysoprase
Nickel-bearing Chalcedony (SiO2 with Ni impurities)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide impurities), SiO2
mineral
Massive Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Opal
Hydrated Silica (SiO2·nH2O)
mineral
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Yellow Jasper
Silicon Dioxide (SiO2) with goethite/iron oxide inclusions
sedimentary
Tiger's Eye
Pseudomorph of quartz after crocidolite (SiO2)
metamorphic
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
metamorphic
Fluorite
Calcium Fluoride (CaF2)
mineral
Epidote
Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))
metamorphic
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Tiger's Eye
Silicon Dioxide with inclusions (SiO2)
mineral
Vesicular Basalt with Opal or Quartz
Vesicular Basalt (Amorphous SiO2.nH2O if Opal)
igneous
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Aquamarine (Rough)
Beryl (Be3Al2Si6O18)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2 with iron impurities)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
metamorphic
Tektite (Indochinite)
Tektite (Amorphous Silica Glass)
igneous
Black Opal
Hydrated Silica (SiO2·nH2O)
mineral
Alexandrite in Matrix
Chrysoberyl (BeAl2O4 with Chromium)
mineral
Green Aventurine (Green Quartz)
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
Mineral/Metamorphic rock
Blue Chalcedony
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral