Euclase | Gemopedia

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. It is only occasionally that 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.
Colors
Colorless, Yellowish To Bluish Green, Blue To Greenish Blue

Euclase Classification

Common Name

Euclase

Species

Euclase

Variety

Colors

Colorless, Yellowish To Bluish Green, Blue To Greenish Blue

Alternate Names

Gemstone Groups

Key Separations

RI, birefringence and optic character

Comments

Euclase Optical Properties

Transparency

Transparent

Refractive Index

1.652-1.671
Tolerance:(+0.006/-0.002)

Birefringence

0.019-0.02

Optic Character

Biaxial

Optic Sign

Positive

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: inert to weak pale yellow
LWUV: inert to weak red

CCF Reaction

Pleochroism

Trichroic, unobservable or weak, colorless, yellowish green, and blue-green

Dispersion

Strength: weak fire Value: 0.016

Comments

Euclase Chemistry & Crystallography

Chemical Name

beryllium aluminum silicate hydroxide

Chemical Formula

BeAlSiO4OH

Synthesis

Crystal System

Monoclinic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Euclase Characteristic Physical Properties

Hardness

7.5

Streak

White

Specific Gravity

3-3.12 Typical:3.08

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

Stability

Fracture

Conchoidal

Cleavage

Perfect, in one direction, Good, in two directions

Comments

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