Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
gemstone
Category
Mineral (Tectosilicate)
Browse mineral (tectosilicate) specimens identified by the Rock Identifier community.
Learn about Mineral (Tectosilicate) in the encyclopedia
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Amethyst on Agate
Crystalline Quartz (SiO2) with trace Iron (Fe3+)
mineral
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
Hematite Nodules (Moqui Marbles style)
Iron Oxide (Fe2O3)
mineral
Sunstone
Oligoclase (Plagioclase Feldspar subclass), (Ca,Na)(Al,Si)4O8
mineral
Citrine (Heat-treated Amethyst)
Silicon Dioxide (SiO2) with iron impurities
mineral
Emerald
Beryl (Be₃Al₂(SiO₃)‑₆) with Chromium/Vanadium impurities
mineral
Amethyst Geode
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
Ruby in Zoisite
Anyolite (combination of Ca2Al3(SiO4)3(OH) and Al2O3:Cr)
metamorphic
Amethyst (Rough Crystal)
Silicon Dioxide (SiO2 with ferric iron impurities)
mineral
Amethyst
Quartz (Silicon Dioxide, SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2)
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
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst
SiO2 (Silicon Dioxide with iron impurities)
mineral
Boulder Opal
Hydrated Silica (SiO2·nH2O)
mineraloid
Quartz (Clear / Rock Crystal)
Silicon Dioxide (SiO2)
Mineral
Sunstone (Oregon Sunstone)
Labradorite (Feldspar variety) - (Ca, Na)(Al, Si)4O8
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
Amazonite
Amazonite (KAlSi3O8)
mineral
Amazonite
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Amazonite
Amazonite (KAlSi3O8)
mineral
Amethyst
Quartz (Silicon Dioxide with iron impurities), SiO2
mineral
Rough Tanzanite
Zoisite (Ca2Al3(SiO4)3(OH))
mineral
Citrine (Heat-treated or Natural Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (Citrine or Smoky variant)
Silicon Dioxide (SiO2)
mineral
Citrine
Quartz (Silicon Dioxide - SiO2)
mineral
Chrysocolla in Quartz (Gem Silica)
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla) / SiO2 (Quartz)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Limonite Pseudomorph after Pyrite
Goethite/Limonite FeO(OH)·nH2O replacing Pyrite FeS2
mineral
Rose Quartz
Silicon Dioxide (SiO2) with traces of titanium, iron, or manganese
mineral