QUALITY ROUGH

BERYL ROUGH

This is a natural untreated rough of beryl mined in Brazil.

Weight 31.90 cts app

Size 27 x 11 x 10 mm app

PHYSICAL CHARACTERISTICS:

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• Color is varied and includes emerald green, blue to blue-green, yellow, greenish-gold, red, colorless and pink.
• Luster is vitreous.
• Transparency: Crystals are transparent to translucent.
• Crystal System is hexagonal; 6/m 2/m 2/m
• Crystal Habits typically include the hexagonal prism with pincoid terminations. The terminations are often modified by many different pyramidal faces which can sometimes produce a rounded termination in the rough shape of a used pencil eraser.
• Cleavage is imperfect in one direction (basal).
• Fracture is conchoidal.
• Hardness is 7.5 - 8.
• Specific Gravity is approximately 2.6 - 2.9 (average)
• Streak is white.
• Other Characteristics: Faces on large crystals are often pitted, striated lengthwise and rough.
• Associated Minerals include micas, quartz, euclase, calcite, tourmalines and some feldspars.
• Notable Occurrences include Colombia and some African localities for emerald; Brazil, Russia and Pakistan for aquamarine; California, Brazil, Africa, and many other localities for other beryls.
• Best Field Indicators are crystal habit, lack of good cleavage, hardness and color.