Oligoclase

Hardness ( Moh )

" 6 - 6.5

Crystal System

Triclinic

Specific Gravity

2.64 - 2.66

Refractive Index

1.542 - 1.549

Birefringence

Family

Colour(s)

White,shaded

Cleavage

Francture Type

Luster

Streak

White

Transparency

Transparent to Translucent

Formula

(Ca,Na)(Al,Si)4O8

Country

Found In Afghanistan,Africa,Algeria,Angola,Antarctica,Argentina,Armenia,Australia,Austria,Belgium,Bolivia,Botswana,Brazil,Bulgaria,Cameroon,Canada,Chad,Chile,China,Czech Republic,Denmark,Ecuador,Egypt,Ethiopia,Finland,Finland/Russia,France,Germany,Greece,Greenland,Guyana,Hungary,Iceland,India,Indonesia,Iran,Italy,Japan,Jordan,Kazakhstan,Kenya,Kyrgyzstan,Libya,Madagascar,Malawi,Malaysia,Mauritania,Mexico,Morocco,Mozambique,Myanmar,Namibia,New Zealand,Niger,North Korea,Norway,Pakistan,Papua New Guinea,Paraguay,Peru,Poland,Portugal,Romania,Russia,Rwanda,Saint Helena， Ascension and Tristan da Cunha,Saint Lucia,Saudi Arabia,Serbia,Slovakia,South Africa,South Korea,Spain,Suriname,Sweden,Switzerland,Tajikistan,Tanzania,Turkey,Uganda,UK,Ukraine,USA,Yemen,Zambia,Zimbabwe