Botryoidal Zincowoodwardite (Picture size: 10 mm) Locality: Lavrion (Laurion), Attica, Greece — Photo: Thomas Witzke · CC BY-SA 3.0 de
Zincowoodwardite
Zincowoodwardite is an IMA-recognized mineral species in the sulfate class, with the chemical formula (Zn₁₋ₓAlₓ)(SO₄)ₓ/₂(OH)₂·nH₂O (x < 0.5, n < 3x/2).
It crystallizes in the hexagonal crystal system (space group P-3). It is a member of the Woodwardite, Hydrotalcite structural group.
Key properties: Mohs hardness 1; specific gravity 2.66; White to bluish white streak; Waxy luster.
IMA symbol Zwwd, IMA status: approved, named in 1998.
It is found associated with The 3R and 1T polytypes commonly are intergrown. Serpierite, hemimorphite (Christiana mine); glaucocerinite, natroglaucocerinite, zaccagnaite (Hilarion mine).
The zinc analog of woodwardite.