Rutile in Quartz (Rutilated Quartz)
SiO2 with TiO2 inclusions
Mineral
Category
Organic Gem Material (Botanical)
Browse organic gem material (botanical) specimens identified by the Rock Identifier community.
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Dendritic Moss Agate
Chalcedony (Silicon Dioxide, SiO2) with inclusions
mineral
Tiffany Stone
Fluorite-bearing Opalized Breccia
Rock/Mineralized Nodule
Baroque Pearl
Biogenic Calcium Carbonate (Aragonite/Conchiolin)
mineral
Amber
Succinite (approximate formula C10H16O)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Pyritized Ammonite
Ammonitida (replaced by Iron Disulfide, FeS2)
sedimentary
Glass
Amorphous Silicon Dioxide (SiO2)
mineraloid
Fossilized Chiton (Polyplacophora)
Polyplacophora (fossilized valves)
mineralized fossil
Quartz Vein in River Siltstone
Crystalline Quartz (SiO2) in Siliclastic Matrix
sedimentary
Pumice or Scoria
Vesicular volcanic rock
Igneous
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Sunstone (Feldspar variety)
(Ca,Na)(Al,Si)4O8 with Hematite or Goethite inclusions
mineral
Amethyst (Raw)
Amethyst (Silicon Dioxide with Iron impurities, SiO2)
mineral
Sunstone (Feldspar)
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
mineral
Citrine Quartz
Crystalline Silicon Dioxide (SiO2) with Ferric Iron impurities
mineral
Amethyst
Amethyst (Purple Quartz); formula: SiO2 (Silicon Dioxide)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Amethyst
SiO2 (Silicon Dioxide) - Purple variety of Crystalline Quartz
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Yellow Quartz (Citrine or Quartz Crystal with Iron Inclusions)
Silicon Dioxide (SiO2)
mineral
Amethyst (Tumbled/Weathered Quartz)
Amethyst (SiO2 with iron impurities)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst
Quartz (Silicon Dioxide) with Ferric Iron impurities - SiO2
mineral
Amethyst
Amethyst (Silicon Dioxide with Iron impurities, SiO2)
mineral
Fire Agate (Rough)
Silicon Dioxide (SiO2) - Variety of Chalcedony
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Sunstone
Plagioclase Feldspar (Na, Ca)(Al, Si)4O8 with Hematite or Copper inclusions
mineral
Amethyst (Raw Quartz)
Silicon Dioxide (SiO2)
mineral
Sunstone
Aventurine Feldspar ((Ca,Na)(Al,Si)4O8)
mineral
Yellow Quartz (Citrine Quartz)
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Shungite
Non-crystalline carbon (Fullerenes)
metamorphic
Amber
Succinite (Resin C10H16O)
mineral
Amber
Succinite (fossilized tree resin)
mineraloid
Black Limestone with Calcite Veins
Limestone (Calcium Carbonate, CaCO3)
sedimentary
Concrete with Aggregate
Artificial Conglomerate (Cement and Aggregate)
sedimentary
Fossil Crab
Decapoda (likely Avitelmessus or Raninidae family)
sedimentary
Amethyst
SiO2 (Silicon Dioxide with Iron impurities)
mineral
Almandine Garnet
Almandine (Fe3Al2Si3O12)
mineral
Asphalt Concrete (Bituminous Conglomerate)
Anthropogenic Bituminous Conglomerate
sedimentary