Woodwardite

Formula: Cu1-xAlx(OH)2(SO4)x/2 · nH2O where (x < 0.5, n < 3x/2); Cu:Al ratios stated to fall between 1.73 and 2.03.

Colour: Greenish-blue, turquoise-blue

Lustre: Waxy, Dull

Hardness: 2

Specific Gravity: 2.38

Crystal System: Trigonal

Member of: Woodwardite Group > Hydrotalcite Supergroup

Name: Named after Samuel Pickworth Woodward (1821–1865), English naturalist and geologist.

Type Locality: Cornwall – England, UK