Emerald
VARIETY INFORMATION:
- VARIETY OF: Beryl, Be3
Al2 Si6 O18 .
- USES: Gemstone.
- BIRTHSTONE FOR: May
- COLOR: various shades of green.
- INDEX OF REFRACTION: 1.57 - 1.60
- BIREFRINGENCE: 0.004 - 0.008
- HARDNESS: 7.5 - 8
- CLEAVAGE: one direction, poor.
- CRYSTAL SYSTEM: hexagonal
- PLEOCHROIC: weak
Emerald is the green variety of the mineral beryl. Other
gemstone color varieties that belong to beryl include aquamarine, morganite, and
heliodor. Other colors of beryl are simply referred to by their color, such as
red beryl.
The wonderful green color of emerald is unparalleled in the
gem kingdom. Emerald's precious green color is caused by small amounts of
chromium and enhanced by traces of iron. Unlike other beryls, emeralds often
contain inclusions and other flaws. These flaws are not looked on as negative
aspects for emerald like they would be for other gemstones. Indeed, these flaws
are considered part of the character of the stone and are used to assure the
purchaser of a natural stone.
Serendipity
Ranch Gem Mine