Cianciulliite

Formula:  Mn(Mg,Mn)2Zn2(OH)10 . 2-4 H2O

Origin of name:  For John Cianciulli, American mineral collector

 

Crystal system:  Monoclinic

Crystal class:  2/m

Twinning:

Unit cell:

 

Colour:  Dark reddish brown

Diaphaneity:

Luster:  Vitreous, pearly to dull

Habit:  Lustrous, euhedral crystal to 0.6 mm, faces commonly curved

Hardness:  2

Specific gravity:

Cleavage:  1; {100} perfect

Tenacity:

Streak:

 

Synonyms/varieties:

 

Comments:  Luster various on different faces; hardness estimated

 

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