Euclase

Euclase is a rare stone. The most attractive color is pale aquamarine blue. However, it also occurs in green, white, and colorless forms. A euclase crystal is prismatic with perfect cleavage. Hence, it is fragile and must be cut and handled with care. It is common to find black mineral inclusions in the gemstone. The rough euclase crystal has a striated prism on its end. It has a conchoidal fracture.

Occurrence

Euclase occurs primarily in pegmatites. Localities include Tanzania, Brazil, Kenya, Zaire, India, the former USSR, the USA, and Zimbabwe.

Euclase Properties

• Specific Gravity: 3.10
• Refractive Index: 1.65-1.67
• Birefringence (DR): 0.019
• Luster: Vitreous
• Crystal Structure: Monoclinic
• Composition: Beryllium aluminum hydroxy silicate
• Hardness: 7½

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