QUALITY ROUGH

BERYL ROUGH

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

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.

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