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10 FACTS ABOUT EUCLASE
1 The name "euclase" is derived from the Greek words euand klasis, which together mean "good fracture”.
2 Euclases may have variable hardness even within the same crystal.
3 Although hard enough to be worn safely in jewelry, euclase in beautiful colors is rare over a few carats. It’s also a difficult gem to facet. Their perfect cleavage in one direction makes cutting a bit tricky.
4 Euclase comes in an array of compelling colors - from blue to blue-green, green, yellow, white, colorless, and, rarely, purple. Strongly colored euclases in blue or green are prized by collectors of rare gems. Violet is the rarest and most desired color. Colorless euclase may not look terribly exciting, but faceted pieces can have exceptional brilliance.
5 Most euclases receive what color they have from traces of iron. However, some euclases from Colombiareceive their greenish blue color from traces of chromium.
6 The Journal of Gemmology has an interesting article about occurrences of pink-orange euclase hosted in metasedimentary rocks of the OURICIRI DO OURO formation in central Bahia State of eastern Brazil. These occurrences were discovered in 2015-2016 and a small amount of material entered the gem shows in 2018. In article in Gems and Gemology reports that the padparadscha-like orange-pink color of the euclase is caused by impurities of Mn3+. The article includes a photograph and photomicrographs of a 10.82 carat transparent euhedral crystal displaying a fine silk of acicular crystals.
7 Crystals most commonly occur in small sizes, about 1” for colorless material. Blue and green gems are scarce over 2-3 carats. Some Brazilian violet crystals reportedly could yield stones up to 10 carats.
8 Several of the Brazilian pegmatites have produced excellent examples of this rare mineral. Some of the most beautiful Euclase crystals, including the color zoned variety, have come from Alto do Giz, Rio Grande do Norte. Very large crystals, some completely transparent with deep color, come from Ouero Prito, Minas Gerais. Large, doubly terminatedcolorless or milky crystals have come from Santana do Encoberto, Minas Gerais; and large colorless crystals from Capelinha, Jequitinhonha Valley, Minas Gerais.
Highly transparent, blue and aquamarine-colored Euclase crystals are found in the Colombian Emerald deposits at Gachalá, Cundinamarca Department; and at the La Marina Mine, Mun. de Pauna, Boyacá Department. Across the Atlantic, the locality of Mwami (Miami), Karoi District, Zimbabwe has produced deep ink-blue crystals of Euclase with an absolutely incredible color.
In Europe, small colorless crystals have come from Grieswies, Rauris valley, Austria; and Weissenstadt, Upper Franconia, Bavaria, Germany. A recent find in China has produced large white and yellow crystals at the Piaotang Mine, Xihuashan, Jiangxi Province.
9 Light BlueEuclase can cost $10-$103 per carat, color-zoned gems can be $260-$360 per carat. Yellow-green: $35-150 per carat. Colorless: $100-$150 per carat.
10 Blue and green may be produced by irradiation of colorless stones
Our Euclase listings:
https://theglobalstone.com/search?page=1&q=euclase&type=product
Reference List:
https://www.gemsociety.org/article/euclase-jewelry-and-gemstone-information/
https://geology.com/minerals/euclase.shtml
https://www.gia.edu/gems-gemology
https://www.gemdat.org/gem
