Pseudograndreefite

Formula: Pb6(SO4)F10

Origin of name: from Greek pseudo = false and grandreefite

 

Crystal system: orthorhombic

Crystal class: 222

Twinning: 

Unit cell: 

 

Colour: colourless

Diaphaneity: transparent

Luster: subadamantine

Habit: square (pseudotetragonal) tabular crystals form aggregates to 4 mm

Hardness: 2.5

Specific gravity: 7.01

Cleavage: none

Tenacity: 

Streak: white

 

Synonyms/varieties:

 

Comments: 

 

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