Boyleite

Formula:  (Zn,Mg)SO4 . 4H2O

Origin of name:  For R. Boyle

 

Crystal system:  Monoclinic

Crystal class:  2/m

Twinning:

Unit cell: a = 5.95, b = 13.6, c = 7.96, β = 90.3°

 

Colour:  White

Diaphaneity: Transparent to translucent

Luster: Vitreous-dull

Habit:  Earthy or reniform

Hardness:  ~ 2

Specific gravity:  2.41

Cleavage:  None

Tenacity: Uneven fracture

Streak: White

 

Synonyms/varieties:

 

Comments:

 

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