Abstract

Elyite, Pb4Cu(SO4)(OH)8, was found at Ward, Nevada where it occurs in voids in massive sulfides showing incipient oxidation to supergene galena, serpierite, and langite.

The color is violet with a pale streak; H = 2, Gmeas ∼ 6, ρcaic- = 6.321 gcm.−3. Good cleavage on {001}, and crystals are sectile. Crystals are monoclinic 2/m and show: a {100}, c {001}, d {501}, k {120}, I {310}, and h {211}. Twinning in {001} common, α = 1.990, β = 1.993, γ = 1.994.

Cell dimensions are a = 14.248Å, b = 5.768, c = 7.309; β = 100°26’, P21/a. Z = 2. The strongest lines (in Å) are 7.189 (99), 6.999 (100), 4.456 (25), 3.627 (21), 3.341 (31), 3.136 (32), 3.081 (29), 3.047 (30), 2.995 (73), and 2.884 (37).

Chemical analyses gave (averaged and calculated to 100%): PbO 79.40%, CuO 7.76%, SO3 6.90%, and H2O 5.93% which leads to Pb4Cu(SO4)(OH)8.

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