Black Opal
Hydrated Amorphous Silica (SiO2 "n" H2O)
gemstone
Category
Man Made Object (Ring)
Browse man made object (ring) specimens identified by the Rock Identifier community.
Learn about Man Made Object (Ring) in the encyclopedia
View all →
Amethyst on Agate
Crystalline Quartz (SiO2) with trace Iron (Fe3+)
mineral
Banded Agate (Onyx type)
Silicon Dioxide (SiO2)
mineral
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Sunstone
Oligoclase (Plagioclase Feldspar subclass), (Ca,Na)(Al,Si)4O8
mineral
Pearl
Calcium Carbonate (CaCO3) with Conchiolin
mineral
Aquamarine (Pendant) and Jasper (Beads)
Beryllium aluminum silicate (Be3Al2Si6O18) with Chalcedony (SiO2)
mineral
Petoskey Stone (Fossilized Coral)
Hexagonaria percarinata
sedimentary
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Moonstone (specifically Cat's Eye or Gray Moonstone)
Orthoclase (Potassium Aluminum Silicate) with the formula (K,Na)AlSi3O8
mineral
Sunstone
Plagioclase Feldspar ((Ca,Na)(Al,Si)4O8)
mineral
Moonstone
Orthoclase (Potassium Aluminum Silicate, KAlSi3O8) with inclusions of Albite
mineral
Iron-Nickel Meteorite
Siderite (Meteoric Iron-Nickel alloy)
igneous
Black Onyx
Silicon Dioxide (SiO2)
mineral
Moonstone (Feldspar)
Orthoclase feldspar, (K,Na)AlSi3O8
mineral
Amethyst (Faceted Gemstone)
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Carnelian (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Diamond (in a jewelry setting)
Cubic Carbon (C)
mineral
Black Pearl (Tahitian or Irradiated Type)
Organic gemstone (Calcium Carbonate with Conchiolin Binding)
mineraloid
Amethyst
Silicon Dioxide (SiO2) with Iron impurities
mineral
Amethyst
Amethyst (SiO2 - Silicon Dioxide with iron impurities)
mineral
Sunstone
Oligoclase (Plagioclase Feldspar) - (Ca, Na)(Al, Si)4O8
mineral
Moonstone
Orthoclase feldspar ((K,Na)AlSi3O8)
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Moonstone
Orthoclase feldspar (KAlSi3O8)
mineral
Green Moonstone
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Moldavite
Moldavite (Siliceous vitreous substance)
tektite (natural glass)
Yellow Jade
Jadeite or Nephrite (NaAlSi2O6 or Ca2(Mg,Fe)5Si8O22(OH)2)
metamorphic
Druzy Quartz Geode
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Pearl
Calcium Carbonate (CaCO3)
mineral
Tanzanite
Blue/Violet Variety of Zoisite (Ca2Al3(SiO4)3(OH))
mineral
Apache Tear (Obsidian)
Obsidian / Amorphous Volcanic Glass (primarily SiO2)
igneous
Moonstone (Orthoclase Feldspar)
Orthoclase (KAlSi3O8) with Albite (NaAlSi3O8)
mineral
Carnelian
SiO2 (Silicon Dioxide) with Iron Oxide impurities
mineral
Blue Topaz
Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Carnelian Agate
Silicon Dioxide (Chalcedony variety), SiO2
gemstone
Diamond (or Clear Quartz / Cubic Zirconia)
Carbon (C) or Silicon Dioxide (SiO2) / Cubic Zirconia (ZrO2)
gemstone
Copper Composite Turquoise (Purple and Blue)
Composite Hydrous copper aluminum phosphate with bronze/copper matrix binding
gemstone
Black Onyx
Chalcedony (Silicon Dioxide - SiO2)
mineral