10 Photos
Hydrozincite
Chemical Formula	Zn5(CO3)2(OH)6
Species	Carbonates
Crystal System	Monoclinic
Mohs Scale	2
Specific Gravity	3.5-4
Color	White to grey, stained pale pink, or pale yellow or brown; colourless in transmitted light.
Streak	White
Luster	Silky, Pearly, Dull, Earthy
Refractive Index	n = 1.630 n = 1.642 n = 1.750
Diaphaneity	Transparent, Translucent
Cleavage	PerfectOn .
Fracture	Irregular/Uneven
Crystal Habit：Lathlike or bladed crystals uncommon, in fibrous, stalactitic, reniform, pisolitic aggregates; also earthy, chalky, massive
Geological Setting：Oxidized zones of zinc mineral deposits, particularly those with sphalerite.

Hydrozincite, also known as zinc bloom, is a white carbonate mineral consisting of Zn₅(CO₃)₂(OH)₆. It is usually found in massive rather than crystalline form.

It occurs as an oxidation product of zinc ores and as post mine incrustations. It occurs associated with smithsonite, hemimorphite, willemite, cerussite, aurichalcite, calcite and limonite.

It was first described in 1853 for an occurrence in Bad Bleiberg, Carinthia, Austria and named for its chemical content.