Hematite
Hematite (Fe2O3)
mineral
Category
Organic Gemstone
Browse organic gemstone specimens identified by the Rock Identifier community.
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Orange Quartz (Citrine Quartz)
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide with Iron impurities (SiO2)
mineral
Agate
Silicon Dioxide (SiO2)
mineral
Pink Quartzite
Quartzite (primarily SiO2 with trace Fe2O3)
metamorphic
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Amazonite
K(AlSi3O8) - Potassium Feldspar (Microcline variant)
mineral
Almandine Garnet
Fe3Al2(SiO4)3
mineral
Yellow Aventurine
Silicon Dioxide (SiO2) with inclusion of Mica
Mineral (Variety of Quartz)
Carnelian
Carnelian (SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions
sedimentary
White Quartz (Tumbled)
Quartz (Silicon Dioxide, SiO2)
mineral
Amazonite (Amazon Stone)
Tectosilicate Microcline (KAlSi3O8)
mineral
Milky Quartz (Quartz Vein)
Silicon Dioxide (SiO2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Epidote
Epidote ({Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))
mineral
Aquamarine
Beryl (Be₃Al₂Si₆O₁₈)
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Carnelian (a variety of Chalcedony)
Silicon Dioxide (SiO2) with Iron Oxide impurities
mineral
Greenstone
Metabasalt
metamorphic
Yellow Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Citrine Quartz
Crystalline Quartz (SiO2 with iron impurities)
mineral
Kyanite (Blue and Green varieties)
Kyanite (Al₂SiO₅)
mineral
Chert (and Chalcedony/Agate mixture)
Microcrystalline Quartz (SiO2)
sedimentary
Hematite
Iron(III) oxide (Fe2O3)
Mineral
Unakite (Epidotized Granite)
Epidote-Feldspar-Quartz Rock
metamorphic
Amazonite
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Sodalite
Sodalite (Sodium Aluminum Silicate Chloride) - Na8(Al6Si6O24)Cl2
mineral
Pink Tourmaline in Quartz Matrix
Elbaite (Na(Li,Al)3Al6(BO3)3Si6O18(OH)4) with Quartz (SiO2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Amethyst
SiO2 (Silicon Dioxide with Iron impurities and natural radiation influence)
mineral
Epidote
{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
mineral
Jasper
Jasper (Silicon Dioxide, SiO2 with iron inclusions)
sedimentary
Specular Hematite (Specularite)
Iron Oxide (Fe2O3)
mineral
Yellow Jasper
Cryptocrystalline Quartz (SiO2)
sedimentary
Yellow Quartzite
Quartzite (primarily SiO2)
metamorphic
White Topaz
Aluminum Silicate Fluoride Hydroxide, Al2SiO4(F,OH)2
mineral