Rich deposits of this rare gem were first found in Russia's Ural mountains, but smaller caches of euclase have been sporadically found in other places across the globe. In those smaller finds, specimens are often overlooked and misidentified as less-desirable minerals. Euclase is quite soft and therefore not prime for use in jewelry.
Hardness:
7.5
Density:
3.115 g/cm³
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Properties
Values
Characteristics
Cultural
Common Questions
General Info About Euclase
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Physical Properties of Euclase
Luster
Vitreous
Diaphaneity
Transparent to translucent
Colors
Colorless, white, pale green to deep yellowish green, greenish blue, pale blue to deep blue
Magnetism
Non-magnetic
Tenacity
Brittle
Cleavage
Perfect
Fracture
Conchoidal
Streak
White
Crystal System
Monoclinic
Hardness
7.5 , Extremely hard
Density
3.115 g/cm³, Normal Weight
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Chemical Properties of Euclase
Chemical Classification
Silicates
Formula
BeAl(SiO4)(OH)
Elements listed
Al, Be, H, O, Si
Common Impurities
Zn, F, Ca, Mg, Fe, Na
Optical Properties of Euclase
Refractive Index
1.650-1.677
Birefringence
0.019-0.025
Pleochroism
Weak: colorless to greenish, yellow-green, blue-green
Dispersion
0.016
Optical Character
Biaxial positive
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Rarity
Rare
Characteristics of Euclase
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Cultural Significance of Euclase
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Uses of Euclase
Euclase has no important industrial uses but is sometimes sought after for mineral collections and to cut into gemstones. Its vivid colors and clarity make euclase a beautiful gemstone, but its rarity prevents it from gaining popularity.
Distribution of Euclase
It was first reported in 1792 from the Orenburg district in the southern Urals, Russia, where it is found with topaz and chrysoberyl in the gold-bearing gravels of the Sanarka (nowadays probably, Sakmara River, Mednogorsk district, Orenburgskaya Oblast'). Its type locality is Ouro Prêto, Minas Gerais, Southeast Region, Brazil, where it occurs with topaz. It is found rarely in the mica-schist of the Rauris in the Austrian Alps.
Etymology of Euclase
Euclase crystals are noted for their blue color, ranging from very pale to dark blue. The mineral may also be colorless, white, or light green. Cleavage is perfect, parallel to the clinopinacoid, and this suggested to René Just Haüy the name euclase, from the Greek εὖ, easily, and κλάσις, fracture.
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