Woodwardite Locality: Cornwall , England , UK ( Locality at mindat.org ) Size: 2.9 x 1.8 x 0.7 cm. Woodwardite is a rare hydrated copper sulfate and this fine, old-time piece is from the Type Locality - Cornwall, England. This wavy piece has turquoise-blue edges above bluish-green above sky-blue woodwardite. A striking toenail from a classic locale. Rare. — Photo: Robert M. Lavinsky · CC BY-SA 3.0
Woodwardite
Woodwardite is an IMA-recognized mineral species in the sulfate class, with the chemical formula (Cu₁₋ₓAlₓ)(SO₄)ₓ/₂(OH)₂·nH₂O (x < 0.5, n < 3x/2).
It is a member of the Woodwardite, Hydrotalcite structural group.
Key properties: specific gravity 2.38; optically biaxial.
IMA symbol Wwd, grandfathered status — known before the IMA’s founding, named in 1866.
A rare secondary mineral found in the oxidized zone of copper deposits.
The mineral was named to honor Samuel Pickford Woodward (1821–1865), English geologist and naturalist.