Donbassite

Formula:   Al2Si3AlO10(OH)2 . Al2.33(OH)6

Origin of name:   From locality, Donets Basin, Ukraine

 

Crystal system:   Monoclinic

Crystal class:   2

Twinning:

Unit cell: 

 

Colour:   White

Diaphaneity:

Luster:   Pearly

Habit:   Flaky aggregates

Hardness:   2.5

Specific gravity:   2.63

Cleavage:   1

Tenacity: 

Streak: 

 

Synonyms/varieties:

 

Comments:

 

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