Sandstone (Quartzose)
Arenite (predominantly SiO2)
Category
Browse mineral (gemstone variety of beryl) specimens identified by the Rock Identifier community.
Sandstone (Quartzose)
Arenite (predominantly SiO2)
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
Pearl
Biogenic Calcium Carbonate (Aragonite and Conchiolin), CaCO3
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')
Calcite (CaCO3)
Peridot (Olivine)
Olivine, (Mg, Fe)2SiO4
Milky Quartz
Quartz / Silicon Dioxide (SiO2)
White Agate (Chalcedony)
Agate (Silicon Dioxide - SiO2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Yellow Agate / Chalcedony
Silicon Dioxide (SiO2)
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
Chalcedony (Agate/Carnelian)
Cryptocrystalline Silicon Dioxide (SiO2)
Turquoise
Hydrated copper and aluminum phosphate (CuAl6(PO4)4(OH)8·4H2O)
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
Jasper (Tumbled)
Silicon Dioxide (SiO₂)
River Pebble (Brecciated Chert/Siltstone)
Silicon Dioxide (SiO2) with mineral inclusions
Mixed Tumbled Stones Collection
Mixed Silicates and Carbonates (Quartz, Amorphous Silica, Carbonates)
Chert (Jasper/Agate variety)
Microcrystalline quartz (SiO2)
Pink Feldspar (Orthoclase)
Orthoclase Feldspar (KAlSi3O8)
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
Rhodonite
Rhodonite (Manganese silicate, (Mn,Fe,Mg,Ca)SiO3)
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
Pearl
Aragonite (CaCO3) with Conchiolin
Quartz (Microcrystalline/Macro crystalline variety)
Silicon Dioxide (SiO2)
Rutilated Quartz
Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Opal
Hydrated silica (SiO2·nH2O)
Sunstone
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
Quartzite with Quartz Vein
Metamorphosed Quartz-rich Arenite (SiO2)
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Ocean Jasper
Silicon Dioxide (SiO2) with various inclusions
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Sandstone (Water-worn Pebble)
Clastic Sedimentary Rock (primarily SiO2)
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
Hematite
Iron(III) oxide (Fe2O3)
Olivine (Peridot)
Magnesium Iron Silicate ((Mg, Fe)2SiO4)
Milky Quartz
Silicon Dioxide (SiO2)
Hemimorphite on Limonite Gossan
Hemimorphite (Zn4Si2O7(OH)2·H2O) on Limonite matrix
Tourmaline (likely Schorl)
Tourmaline Group Mineral (e.g., Schorl for black varieties); (Na,Ca)(Li,Mg,Fe,Mn,Al)3Al6(BO3)3Si6O18(OH)4
Diamond
Diamond (pure Carbon, C)