This is a natural untreated rough of
beryl mined in Brazil.
is varied and includes emerald green, blue to blue-green, yellow,
greenish-gold, red, colorless and pink.
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
is imperfect in one direction (basal).
is 7.5 - 8.
- Specific Gravity
is approximately 2.6 - 2.9 (average)
- 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.