Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Category
Mineral Specimen
Browse mineral specimen specimens identified by the Rock Identifier community.
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Charoite
K(Ca,Na)2Si4O10(OH,F)·H2O
metamorphic
Chrysocolla
Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·n(H2O)
mineral
Amazonite
Potassium aluminum silicate (KAlSi3O8)
mineral
Raw Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Potassium Feldspar (Microcline)
KAlSi3O8
mineral
Glaucophane Schist (Blueschist)
Blueschist (Glaucophane-bearing schist)
metamorphic
Weathered iron-rich rock, possibly laterite or limonite-bearing stone
Hydrated iron oxides/hydroxides, chiefly limonite-goethite mixture; exact identification requires testing
mineral
Green Fluorite (Botryoidal/Massive)
Calcium Fluoride (CaF2)
mineral
Muscovite Mica Schist
Metamorphic Rock (Muscovite-Biotite Schist)
metamorphic
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite
mineral
Prehnite
Ca2Al(AlSi3O10)(OH)2
mineral
Quartz (Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Beryl (likely Aquamarine or Heliodor variant)
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Hemimorphite
Hemimorphite (Zn4Si2O7(OH)2·H2O)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper
Microcrystalline Quartz (SiO2) with iron oxide inclusions
sedimentary
Pyrite in Quartz
Iron Sulfide (FeS2) with Silicon Dioxide (SiO2)
mineral
Carnelian
Silicon Dioxide (Chalcedony variety), SiO2
mineral
Pyrite Nodule
Iron Sulfide (FeS2)
mineral
Fuchsite (Green Muscovite / Mica Schist)
Chromian Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Amethyst Cluster
Silicon Dioxide (SiO2) with iron impurities
mineral
Fuchsite
Chromian Muscovite, K(Al,Cr)2(AlSi3O10)(OH)2
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Lake Superior Agate
Silicon Dioxide (SiO2) - Banded Chalcedony
mineral
Aquamarine
Beryl (Be3Al2Si6O18)
gemstone
Quartz with Schorl inclusions
Silicon Dioxide (SiO2) with Sodium Iron Aluminum Borosilicate Hydroxide (Black Tourmaline)
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Calcite in Matrix
Calcium Carbonate (CaCO3) on Sedimentary Host Rock
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions (Hematite/Goethite)
mineral
Ocean Jasper
Orbicular Jasper (variety of Chalcedony/Quartz, SiO2)
sedimentary
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Amazonite
Tectosilicate (variety of Microcline), K(AlSi3O8)
mineral
Beryl (likely Aquamarine or Green Beryl)
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Gold in Quartz Matrix
Native Gold (Au) with Quartz (SiO2)
mineral
Schorl (Black Tourmaline) in Quartz/Feldspar Matrix
NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
mineral
Limonite pseudomorph after Pyrite
Goethite/Limonite FeO(OH)·nH2O
mineral
Quartz (Milky/Smoky Quartz)
Silicon Dioxide (SiO2)
mineral
Mica Schist (Greenschist / Chlorite Schist)
Schist (rich in Muscovite, Chlorite, and Quartz)
metamorphic