Raw Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Category
Organic Gemstone (Not A Mineral)
Browse organic gemstone (not a mineral) specimens identified by the Rock Identifier community.
Learn about Organic Gemstone (Not A Mineral) in the encyclopedia
View all →
Druzy Quartz on Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Amethyst variety)
Silicon Dioxide (SiO2)
mineral
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Amethyst (Cabochon)
Silicon Dioxide (SiO2) with iron impurities
mineral
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Amazonite
Amazonite (K(AlSi3O8))
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Chrysocolla
Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Red Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with Fe2O3 inclusions)
metamorphic
Amazonite
Potassium Feldspar (KAlSi3O8)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartz (Smoky Quartz variant)
Silicon Dioxide (SiO2)
mineral
White Opal (Common)
Hydrated Silica (SiO2·nH2O)
mineral
Rainbow Moonstone with Black Tourmaline
White Labradorite (Feldspar variety, (Na,Ca)(Al,Si)4O8) with Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Ethiopian Fire Opal
Hydrated Silica (SiO2·nH2O)
mineral
Chlorastrolite (Isle Royale Greenstone)
Chlorastrolite (Pumpellyite-(Mg,Al)), formula: Ca2(Mg,Fe)Al2(SiO4)(Si2O7)(OH)2∙H2O
mineral
Shale (sub-type: Carbonaceous Shale)
Lutaceous Sedimentary Rock
sedimentary
Banded Agate
Cryptocrystalline Quartz (SiO2)
mineral
Jasper (Mookaite variety likely)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified wood (SiO2 - Silicon Dioxide)
sedimentary
Petrified Wood
Silicified wood (Quartz variant, SiO2)
sedimentary
Petrified Wood (Silicified Wood)
Silicified Paleoflora (mainly Quartz, SiO2)
metamorphic
Limonite-stained Chert
Silicon Dioxide (SiO2) with Hydrated Iron Oxide (FeO(OH)·nH2O)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Sandstone Pebble
Arenite (primarily SiO2)
sedimentary
Concretionary Sandstone
Clastic Sedimentary Rock (Sandstone with secondary mineral cementation)
sedimentary
Rutilated Prehnite
Prehnite - Ca2Al(AlSi3O10)(OH)2 with Epidote/Tourmaline inclusions
mineral
Lapis Lazuli
Lapis Lazuli (A metamorphic rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Chert (Flint)
Chert (Microcrystalline or cryptocrystalline Quartz, SiO2)
sedimentary
Pebble
Clast (specifically a granule or small pebble)
Sedimentary
Emerald in Matrix
Emerald (Beryllium Aluminum Silicate), Be3Al2(SiO3)6
mineral
Carnelian
Carnelian (subset of Chalcedony); SiO2 with Iron Oxide impurities
mineral
Petrified Wood
Silicified wood (Quartz/Chalcedony - SiO2)
sedimentary
Glauconitic Sanstone (Glauconite)
Glauconite ((K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Moss Agate
Silicon dioxide (SiO2) with mineral inclusions
Mineral
Chert (Arrowhead Fragment)
Microcrystalline Quartz (SiO2)
sedimentary
Mother of Pearl (Nacre)
Aragonite (layered with organic polymers), CaCO3
mineral
Purple Agate (Dyed Chalcedony)
SiO2 (Silicon Dioxide) with organic dyes
mineral
Feldspar (Orthoclase)
Orthoclase Feldspar (KAlSi3O8)
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18) with trace amounts of Chromium/Vanadium
mineral