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Summary Embreyite is a new mineral that has been found only in old specimens collected at Berezov, Siberia. The composition is Pb 4·97 (CrO 4 ) 2·00 (PO 4 ) 1·91 .0·75H 2 O, or Pb 5 (CrO 4 ) 2 (PO 4 ) 2 . H 2 O based on both wet and electron-probe analyses. Z = I, D meas 6·45, D eale 6·41. Crystals are monoclinic with a 9·755 Å, b 5·636, c 7·135, β 103°5′ the space group may be P 2 1 / m . No single crystals were found. α = 2·20, β = γ = 2·36. Colour in various shades of orange with a yellow streak. H = 3½; no cleavages observed. Occurs with vauquelinite, crocoite, and phoenicochroite in the oxide zone assemblage from Berezov.
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S. A. Williams (1972) studied this question.
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