Carnelian Agate
Silicon Dioxide (SiO2) - Variety: Chalcedony
Category
Browse mineral (specifically a variety of quartz) specimens identified by the Rock Identifier community.
Carnelian Agate
Silicon Dioxide (SiO2) - Variety: Chalcedony
Agate (specifically Botswana or Lake Superior style chalcedony)
Silicon Dioxide (SiO2)
Milky Quartz with Mineral Inclusions
Quartz (Silicon Dioxide, SiO2)
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Jadeite (Jade)
Jadeite (NaAlSi2O6)
Banded Agate (Tumbled)
Silicon Dioxide (SiO2)
Yellow Calcite
Calcium Carbonate (CaCO3)
BROWN GRANITE (likely 'Tan Brown' or similar)
Granite (specifically a variety rich in orthoclase feldspar, often with biotite and possibly hornblende)
Carnelian Agate
Chalcedony (SiO2 with Iron Oxides)
Carnelian
Cryptocrystalline Quartz (SiO2)
Orbicular Granite (specifically Mustard or Yellow Tonalite/Granodiorite)
Orbicular Quartz Diorite / Tonalite
Diorite (Gneissic)
Diorite
Sandstone Concretion
Moqui Marble / Ironstone Concretion (Iron oxide-cemented sandstone)
Rose Quartz
Silicon Dioxide (SiO2)
Citrine Quartz
Citrine (Silicon Dioxide, SiO2)
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities
Chalcedony (Agate and Carnelian varieties)
Silicon Dioxide (SiO2)
Carnelian Agate
Silicon Dioxide (SiO2) with Iron Impurities
Schist (specifically Chlorite/Greenschist)
Chlorite Schist
Selenite
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
Banded Agate (Onyx type)
Silicon Dioxide (SiO2)
Greenschist
Greenschist (Chlorite-actinolite schist)
Red Chalcedony (likely dyed)
Chalcedony (a variety of Quartz), SiO2
Green Chert (Jasper)
Silicon Dioxide (SiO2)
Gypsum (Selenite crystals in Halite/Clay matrix)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
Aventurine
Silicon Dioxide (SiO2) with inclusions
Dalmatian Stone
Dalmatian Jasper (Aphanitic Igneous Rock with Arfvedsonite inclusions)
Chert / Jasper
Silicon Dioxide (SiO2)
Red-and-brown agate bead bracelet
Agate, a microcrystalline variety of quartz (SiO₂), likely colored chalcedony/carnelian
Blue Sapphire
Corundum (Al2O3)
Orange Calcite
Calcium Carbonate (CaCO3)
Chalcedony (Agate/Chert variety)
Silicon Dioxide (SiO2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Moonstone (Green Moonstone / Garnierite)
Potassium Aluminum Silicate (KAlSi3O8) with inclusions of Garnierite
Quartz crystal with Pyrite inclusions
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Green Aventurine
Quartz (Silicon Dioxide, SiO2) with fuchsite inclusions
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
Tourmalinated Quartz
Silicon Dioxide (SiO2) with Schorl inclusions (NaFe2+3Al6(BO3)3Si6O18(OH)4)
Blue Calcite
Calcium Carbonate (CaCO3)
Selenite (gypsum) crystal
Gypsum, CaSO₄·2H₂O; transparent/white variety called selenite