Prehnite

Hardness ( Moh )

" 6 - 6.5

Crystal System

Orthorhombic

Specific Gravity

2.87

Refractive Index

1.611 - 1.665

Birefringence

Family

Colour(s)

Colourless,grey,yellow,green

Cleavage

Francture Type

Brittle

Luster

Streak

colorless

Transparency

Semi-transparent to translucent

Formula

Ca2Al(AlSi3O10)(OH)2

Country

Found In Angola,Antarctica,Argentina,Atlantic Ocean,Australia,Austria,Bailiwick of Guernsey,Belgium,Bolivia,Bosnia and Herzegovina,Brazil,Bulgaria,Canada,Chile,China,Colombia,Costa Rica,Croatia,Cuba,Czech Republic,Dominican Republic,Ecuador,Egypt,El Salvador,Ethiopia,Finland,France,Georgia,Germany,Greece,Greenland,Hungary,Iceland,India,Indian Ocean,Indonesia,Iran,Ireland,Italy,Japan,Jersey,Kazakhstan,Kenya,Madagascar,Malaysia,Mali,Mauritania,Mexico,Middle East,Mongolia,Morocco,Namibia,New Zealand,North Korea,Norway,Oman,Pakistan,Papua New Guinea,Peru,Philippines,Poland,Portugal,Romania,Russia,Slovakia,South Africa,South Korea,Spain,Sweden,Switzerland,Tanzania,Thailand,Trinidad and Tobago,Turkey,UK,Ukraine,USA,Vietnam,Zimbabwe,Mars