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Ammolite
Unprocessed sample of ammolite; a "dragon skin" pattern is apparent
General
Category
fossilized, mineralized Ammonite shell
Formula (repeating unit)
CaCO 3 aragonite polymorph, with minor amounts of calcite, pyrite, silica, and other impurities[1]
Identification
Color
Gray to brown, can be radiant blue, with primarily red to green iridescence.[1]
Cleavage
no true cleavage
Fracture
uneven to granular[1]
Mohs scale hardness
3.5 - 4.5
Luster
greasy to dull[1]
Specific gravity
usually about 2.70 (varies with mineral content)[1]
Polish luster
vitreous[1]
Optical properties
anomalous aggregate reaction[1]
Refractive index
usually 1.52 - 1.68 (varies with mineral content)[1]
Birefringence
0.135 - 0.145[1]
Pleochroism
none[1]
Ultraviolet fluorescence
variable[1]
Ammolite is an opal-like organic gemstone found primarily along the eastern slopes of the Rocky Mountains of North America. It is made of the fossilized shells of ammonites, which in turn are composed primarily of aragonite, the same mineral contained in nacre, with a microstructure inherited from the shell. It is one of few biogenic gemstones; others include amber and pearl.[a]
In 1981, ammolite was given official gemstone status by the World Jewellery Confederation (CIBJO), the same year commercial mining of ammolite began. It was designated the official gemstone of the City of Lethbridge, Alberta in 2007.[2][3]
Ammolite is also known as aapoak (Kainah for "small, crawling stone"), gem ammonite, calcentine, and korite. The latter is a trade name given to the gemstone by the Alberta-based mining company Korite. Marcel Charbonneau and his business partner Mike Berisoff were the first to create commercial doublets of the gem in 1967. They went on to form Ammolite Minerals Ltd.
^ abcdefghijkGem Reference Guide. Gemological Institute of America. 1988. ISBN 978-0-87311-019-8.
^"Ammolite". Jewellery Business Magazine. June 2007. Archived from the original on July 3, 2007. Retrieved July 20, 2007.
^"Minutes of City Council Meeting" (PDF). City of Lethbridge, Alberta. April 30, 2007. Retrieved December 5, 2007.[dead link]
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Ammolite is an opal-like organic gemstone found primarily along the eastern slopes of the Rocky Mountains of North America. It is made of the fossilized...
international partners. Ammolite mining for example provides a rare highly demanded gem mineral to Asia for Feng Shui. Ammolite is currently known only...
in 2021,[citation needed] they released their debut major label album, Ammolite, in September 2023. It contained their previously released singles "Everblue"...
Korite is the largest commercial producer of ammolite. The company produces natural ammolite gemstones and jewelry. Korite is based in Calgary, Alberta...
fossil shells of some extinct ammonites forms an iridescent material called ammolite. Aragonite also forms naturally in the endocarp of Celtis occidentalis...
There are a number of organic materials used as gems, including: Amber Ammolite Ammonoidea Bone Copal Coral Ivory Jet Nacre (Mother of pearl) Operculum...
display iridescence. These iridescent ammonites are often of gem quality (ammolite) when polished. In no case would this iridescence have been visible during...
Recent Ancient Coin Acquisitions Focus on Alexander the Great Ammonite to Ammolite "Eponyms". h2g2. BBC Online. 11 January 2003. Archived from the original...
polished. Wikimedia Commons has media related to Blue amber. Dominican amber Ammolite Copal List of minerals Brost, Leif; Dahlstrom, Ake (1996). The Amber Book...
especially polymethyl methacrylate PMMA (trade mark Plexiglass, metaplex). Ammolite List of types of amber Petrified wood Pearl Poly(methyl methacrylate) Precious...
treated glass was reportedly 200 times tougher than untreated glass. Ammolite Pearling in Western Australia Raden "nacre". Dictionary.com Unabridged...
Latter Day Saint denominations. Pearl is a Middle English religious poem. Ammolite – another organic gemstone formed primarily of fossil aragonite mollusk...
ammonites, some of which are mined in Alberta to produce the organic gemstone ammolite. The formation was deposited in the Bearpaw Sea, which was part of the...
microcline) Amethyst (purple variety of quartz) Ametrine (variety of quartz) Ammolite (organic; also a gemstone) Amosite (asbestiform grunerite) Antozonite (variety...
one of five gemstones created from organisms (the others being pearl, ammolite, amber and jet). Minerals replacing organic materials in gembone include...
Taio Cruz, Rudimental and Post Malone among others. In 2019, Emil founded Ammolite, Inc., a creative and production studio in Los Angeles, California. He...
Recent Ancient Coin Acquisitions Focus on Alexander the Great Ammonite to Ammolite Daneshgar, Majid (2020). Studying the Qur'ān in the Muslim Academy. AAR...
and the strata revealed by these formations guide local prospectors to ammolite deposits. The Oldman River contains fish species such as rainbow trout...
diameter fossil of an ammonite, which is composed entirely of the gemstone ammolite, made its debut at the museum. Neil Landman, curator of fossil invertebrates...
millimeters. The surface of fossils is usually covered by opalized nacre (ammolite). The name honours Fielding Bradford Meek. Ammonites J.B. Reeside A comparison...
2006-12-06. Retrieved 2007-02-09. Bill 208 assembly.ab.ca "Recognizing ammolite as the official gemstone of Alberta". "News search". Comox School district...
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