Chalcedony (specifically Agate and Carnelian variety)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Category
Mineral (Gemstone Variety Of Beryl)
Browse mineral (gemstone variety of beryl) specimens identified by the Rock Identifier community.
Learn about Mineral (Gemstone Variety Of Beryl) in the encyclopedia
View all →
Peridot
Olivine (Mg,Fe)2SiO4
Mineral
Orbicular jasper (likely ocean jasper)
Silica-rich microcrystalline quartz/chalcedony with iron-oxide and feldspar inclusions; commonly marketed as Ocean Jasper
mineral
Mixed Tumbled Gemstones (Agate, Aventurine, Pyrite, etc.)
Multiple (principally Silicon Dioxide SiO2 and Iron Disulfide FeS2)
mineral
Red Jasper (Quartz)
Silicon Dioxide (SiO2) with Iron impurities
sedimentary
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Picture Jasper
Opaque microcrystalline quartz (SiO2 with iron oxide impurities)
sedimentary
White Quartz Star
Silicon Dioxide (SiO2)
mineral
Mixed Gemstone Collection
SiO2 (Quartz varieties) and Biogenic CaCO3 (Nacre)
mineral
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Green Chalcedony Ring
Silicon Dioxide (SiO2)
gemstone
Moonstone (Rainbow Moonstone with Tourmaline)
White Labradorite (Feldspar variety) - (Na,Ca)(Al,Si)4O8
gemstone
Quartz (likely) / Siliceous rock with quartz phenocrysts (if a rock fragment)
Quartz (SiO₂)
Mineral
Amethyst
SiO2 (Silicon Dioxide) - a variety of Quartz
Mineral
Black Tourmaline (Schorl)
Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)
mineral
Tumbled rose quartz (probable)
Quartz, silicon dioxide (SiO₂), pink variety commonly called rose quartz
mineral
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Carnelian
Silicon Dioxide (Chalcedony variety), SiO2
gemstone
Amethyst
Quartz (Silicon Dioxide, SiO2)
gemstone
Polished black gemstone, likely black obsidian
Obsidian (volcanic glass), chiefly silica-rich amorphous SiO₂
igneous
Chert (Nodular)
Chert (SiO2 - Microcrystalline Quartz)
sedimentary
Fluorite and Red Jasper
Fluorite (Calcium Fluoride, CaF2) and Red Jasper (Silicon Dioxide, SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2) - variety Jasper
mineral
Likely citrine pendant
Quartz, silicon dioxide (SiO₂), probably heat-treated amethyst or smoky quartz
gemstone
Tumbled amethyst
Quartz, purple variety — SiO₂, colored mainly by iron impurities and irradiation
gemstone
Diamond and Sapphire
Carbon (Diamond, C) and Aluminum Oxide (Sapphire, Al2O3)
gemstone
Garnet (likely Almandine)
Almandine (Fe3Al2(SiO4)3)
mineral
Banded Agate (specifically Carnelian Agate slice)
Chalcedony (cryptocrystalline variety of Quartz), SiO2
mineral
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities and natural irradiation
mineral
Smoky Quartz
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Citrine
Silicon dioxide (SiO2)
mineral
Agate
Cryptocrystalline quartz (SiO2)
Mineral
Labradorite (Feldspar)
Labradorite: (Ca,Na)(Al,Si)4O8
mineral
Smoky Quartz Cluster
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Quartz (Milky or Smoky tumble)
Crystalline Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Carnelian Agate
Silicon Dioxide (Chalcedony variety), SiO2
gemstone
Carnelian
Silicon Dioxide (Chalcedony variety), SiO2
gemstone
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Blue faceted gemstones, likely blue sapphire
Corundum (Al₂O₃), blue varieties colored chiefly by iron and titanium
gemstone
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace titanium, iron, or manganese
mineral