Carnelian
Carnelian (SiO2)
Category
Browse mineral with artificial coating specimens identified by the Rock Identifier community.
Carnelian
Carnelian (SiO2)
Moonstone
Potassium Aluminum Silicate (KAlSi3O8)
Moss Agate
Chalcedony (SiO2) with inclusions of manganese or iron oxides
Satin Spar Selenite
Satin Spar (Calcium Sulfate Dihydrate, CaSO4·2H2O)
Optical Calcite (Iceland Spar)
Calcite (Calcium Carbonate, CaCO3)
Rainbow Moonstone with Black Tourmaline
White Labradorite with Schorl (Na,Ca)(Al,Si)4O8
Satin Spar (Gypsum)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
Green Calcite
Calcium Carbonate (CaCO3)
Orange Calcite
Calcite (Calcium Carbonate - CaCO3)
Amber
Succinite (approximate formula C10H16O)
Black Onyx
Onyx (Silicon Dioxide, SiO2)
Blue Lace Agate
Cryptocrystalline Quartz (SiO2) with trace minerals
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
Smoky Quartz with Feldspar
Silicon Dioxide (SiO2) with Potassium Feldspar (KAlSi3O8)
Gold Nugget
Native Gold (Au)
Quartz Druze on Matrix
Silicon Dioxide (SiO2)
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
Bloodstone
Heliotrope (Chalcedony)
Red Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
Quartz Pebble
Silicon Dioxide (SiO2)
Red Garnet (Almandine-Pyrope series)
Garnet Group, Almandine (Fe3Al2(SiO4)3) or Pyrope (Mg3Al2(SiO4)3)
Amethyst
Amethyst (Silicon Dioxide, SiO2) with iron impurities
Honey Calcite
Calcium Carbonate (CaCO3)
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
Quartz Geode Fragment
Silicon Dioxide (SiO2)
Amethyst Geodes
Silicon Dioxide (Quartz with Iron impurities), SiO2
Milky Quartz
Silicon Dioxide (SiO2)
Chalcedony
Cryptocrystalline Quartz (SiO2)
Chrysoprase
Silicon Dioxide (Nickel-bearing Chalcedony) - SiO2
Fuchsite
Chromium-bearing Muscovite - K(Al,Cr)2(AlSi3O10)(OH)2
Quartz / Common Opal Transition
Silicon Dioxide (SiO2)
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock)
Amethyst
SiO2 (Silicon Dioxide with Iron impurities)
Sandstone pebble
Sandstone (SiO2 with iron oxides)
Bivalve Fossil (Clam)
Class Bivalvia, likely Mercenaria or similar genus
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
Turquoise (possible Howlite imitation)
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
Howlite
Howlite (Ca2B5SiO9(OH)5)
Amber (and Cubic Zirconia)
Fossilized Tree Resin
Milky Quartz
Quartz (Silicon Dioxide, SiO2)