Brianyoungite

Formula:  Zn3(CO3,SO4)(OH)4

Origin of name:  For Brian Young, collector of the type specimen

 

Crystal system:  Orthorhombic

Crystal class:  Unknown

Twinning:

Unit cell:

 

Colour:  White

Diaphaneity:  Transparent

Luster:  Vitreous

Habit:  Thin blades 1-2 µm taper to sharp point, in aggregates and rosettes

Hardness:

Specific gravity:  3.93 to 4.09

Cleavage:  2; {100} perfect, {001} possible

Tenacity:

Streak:

 

Synonyms/varieties:

 

Comments:  May be monoclinic; readily soluble with effervescence in dilute acids

 

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