BERYL ROUGH CRYSTAL -BRAZIL 40.65 CT [F2989]

Item Information

Dimensions (mm) 41 x 11 x 10mm
Weight (carats) 40.65 carats
Colors

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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$32.00 USD

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Pricing & Details

Auction ID 488103
Watchers 1 watching
Viewed 916 times
Starts 19th Mar 2015 10:15pm PDT

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