BERYL ROUGH CRYSTAL -BRAZIL 34.30 CT [F3027]

Description

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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