Sillimanite

Hardness ( Moh )

" 6.5 - 7.5

Crystal System

Orthorhombic

Specific Gravity

3.25

Refractive Index

1.654 - 1.683

Birefringence

Family

Colour(s)

brown, yellow, yellow-green, grey-green, blue-green, blue, colourless

Cleavage

Francture Type

Splintery

Luster

Streak

White

Transparency

Transparent to translucent

Formula

Al2SiO5

Country

Found In Algeria,Antarctica,Argentina,Australia,Austria,Azerbaijan,Bangladesh,Bolivia,Brazil,Bulgaria,Burkina Faso,Canada,Chile,China,Czech Republic,DR Congo,Egypt,Ethiopia,Finland,France,Germany,Greece,Greenland,Hungary,India,Italy,Ivory Coast,Japan,Kazakhstan,Kenya,Madagascar,Malawi,Mexico,Mongolia,Morocco,Myanmar,Namibia,Nepal,New Zealand,Nigeria,North Korea,Norway,Pakistan,Peru,Poland,Portugal,Romania,Russia,Slovakia,South Africa,South Korea,Spain,Sri Lanka,Suriname,Sweden,Switzerland,Syria,Tajikistan,Tanzania,Turkey,Uganda,UK,Ukraine,United Arab Emirates,USA,Vietnam,Zambia,Zimbabwe