Hydrozincite

Formula:  Zn5(CO3)2(OH)6

Origin of name:  From composition

 

Crystal system:  Monclinic

Crystal class:  2/m

Twinning: 

Unit cell: 

 

Colour:  White, gray, pale shades of yellow, pink, lavender, brown

Diaphaneity: 

Luster:  Pearly on crystals

Habit:  Crystals flattened, lath-like; massive, compact to earthy, dense; crusts; stalactitic; reniform

Hardness:  2 to 2.5

Specific gravity:  3.5 to 3.8

Cleavage:  1; {100} perfect

Tenacity: 

Streak: 

 

Synonyms/varieties:

 

Comments:  Sometimes fluoresces; luster of massive material dull to silky to shining

 

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