
1) Carbonate mineral 2) Monoclinic mineral
Found on
https://www.crosswordclues.com/clue/hydrozincite

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....
Found on
http://en.wikipedia.org/wiki/Hydrozincite

Hydrozincite (zinc bloom) is a hydrous carbonate of zinc, usually occurring in white earthy incrustations mainly in deposits associated with smithsonite and occurs as a result of the oxidation of zinc bearing minerals. A major ore of zinc if found in economic quantities. It has the formulae Zn5(CO3) 2(OH)6 and a relative hardness of 3.
Found on
http://www.probertencyclopaedia.com/browse/HH.HTM

a hydrous zinc carbonate, Zn(CO)(OH), an important ore of zinc in some localities.
Found on
https://www.infoplease.com/dictionary/hydrozincite
No exact match found.