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Euclase

Euclase

By Tim Matthews, JD, FGA, GG, DGA,
CEO and President of JTV (retired)
Published: June 2014
Modified: September 2023
Euclase Polished Euclase Rough
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Table of Contents
  • General Information
  • Euclase Colors
  • Countries of Origin
  • History
  • More About Euclase

Although euclase can resemble beryl in its appearance, that is where the comparison ends. Unlike beryl, euclase contains water, has a monoclinic crystal system, and a higher specific gravity. Only occasionally do its well-formed crystals have sufficient clarity to be cut as gemstones. Crystals are commonly prismatic, can be long or short, and are striated. Because of their rarity, gems with good clarity command premium prices. Most material is colorless to pale blue or pale green, but colors can range from blue to blue-green, green, yellow, white, colorless, and, rarely, purple.

General Information

  • Classification
  • Optical Properties
  • Characteristic Physical Properties
  • Chemistry & Crystallography
Common Name
Euclase
Species
Euclase
Transparency
Transparent
Dispersion
Strength: Weak Fire Value: 0.016
Refractive Index
1.652-1.673 Tolerance: (+0.006/-0.002)
Birefringence
0.019- 0.021
Optic Character
Biaxial
Optic Sign
Positive
Polariscope Reaction
Doubly Refractive (DR)
Fluorescence
SWUV: inert to weak pale yellow
LWUV: inert to weak red
Pleochroism
Trichroic, unobservable or weak, colorless, yellowish green, blue-green;Pink: orange and pink
Hardness
7.5
Streak
White
Specific Gravity
3.000-3.120 Typical:3.080
Toughness
Poor
Inclusions
Euclase can contain quartz and fluid inclusions. Red or blue plate like inclusions and dark gray metallic inclusions of bravoite are possible. Colorless stones or pale yellow stones might have blue-green color zoning.
Luster
Vitreous
Fracture
Conchoidal
Cleavage
Perfect, in one direction, Good, in two directions
Chemical Name
beryllium aluminum silicate hydroxide
Chemical Formula
BeAlSiO4OH
Crystal System
Monoclinic
Chemistry Classification
Silicate

Euclase Colors

  • Blue Euclase
    Blue
  • Colorless Euclase
    Colorless
  • Green Euclase
    Green
  • Orange Euclase
    Orange
  • Pink Euclase
    Pink
  • White Euclase
    White
  • Yellow Euclase
    Yellow

Countries of Origin

Unknown; Brazil

History

It's clear, sparkly, and a 7-1/2 on the Mohs scale. It comes in an array of compelling colors - from blue to blue-green, green, yellow, white, colorless, and, rarely, purple. This stone is extremely rare, and it breaks easily. In fact, its name comes from the Greek words "eu and klasis" which together mean good fracture. All this makes it a great stone for collectors. Euclase can resemble beryl in its appearance, but in no other way are they related. Euclase contains water, has a monoclinic crystal system and a higher specific gravity than beryl. It is only occasionally that its well-formed crystals have enough clarity to be cut as gemstones.

More About Euclase

In modern culture, many stones are ascribed metaphysical properties. There's no scientific evidence that stones have any powers except the power to please. Those who believe in the metaphysical call euclase the happiness stone and believe it can help them feel happy.

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