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Esperite from Franklin, New Jersey, was first described by Moore and Ribbe (1965) as monoclinic with a well-developed “superlattice” a = 2 × 8.814(2) Å, b = 8.270(3) Å, c = 2 × 15.26(1) Å, β ≈ 90°, space group P2 1 /n (subcell), and the chemical formula PbCa 3 (ZnSiO 4 ) 4 . They attributed “superlattice” reflections to the ordered distributions of Pb and Ca cations over four beryllonite-type subcells for esperite with the Ca:Pb ratio greater than 2:1.

The crystal structure of esperite, with a revised chemical formula, PbCa 2 (ZnSiO 4 ) 3 , isostructural with beryllonite