Petarasite

Formula: Na5Zr2Si6O18(Cl,OH).2H2O

Origin of name: for Peter Tarasoff, Canadian amateur mineralogist

 

Crystal system: monoclinic

Crystal class: 2/m

Twinning: 

Unit cell: 

 

Colour: greenish-yellow, yellow, brown

Diaphaneity: transparent, translucent, opaque

Luster: vitreous

Habit: crystals equant, doubly terminated to 6.5 cm

Hardness: 5 to 5.5

Specific gravity: 2.9

Cleavage: none

Tenacity: 

Streak: white

 

Synonyms/varieties:

 

Comments: 

 

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