B4S15: The Gemstones - Beryl

Question 1

What is the crystal system of beryl?

Answer 1

Hexagonal

Question 2

Describe the occurence and crystal habit of beryl.

Answer 2

Mostly found in pegmatites, except emerald which is found in metamorphic and hydrothermal deposits.
Crystals have a prismatic habit and occur in prism, pyramid and pinacoid forms.
Crystal faces may have etch marks.

Question 3

List the colours and varieties of beryl.

Answer 3

Green - emerald
Blue to green - aquamarine
Yellow - heliodor
Pink - morganite
Colourless - goshenite
Brown and black