Esperite PbCa2 (ZnSiO4 )3 IMA symbol: Epr approved
Esperite is a silicate mineral with the formula PbCa2(ZnSiO4)3, crystallizing in the monoclinic system. It has a calculated density of 4.553 g/cm3. Its streak is white.
Crystallography Crystal system monoclinic crystal systemWikidata (CC0) Space group P 1 21/n 1 Cell (Å, °) a = 8.7889, b = 8.2685, c = 15.2535; α = 90, β = 90.05, γ = 90 Cell volume 1108.49 ų, Z = 4 Axial ratios 1.0629:1:1.8448calculated from COD 9016115 Source structure COD 9016115 (American Mineralogist, 2010)
Powder X-ray diffraction (calculated) 2θ (degrees, Cu Kα1) I/I₀ (max 100) d (Å) 7.612 7.618 7.627 3.014 3.011 3.013 I/I₀ 100 98.5 96.4 95.5 95.1 94.3
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9016115; idealized occupancies, no preferred orientation.
Physical properties Density (calculated) 4.553 g/cm³calculated from COD 9016115 Streak whitesingle source Wikidata (CC0)
Chemistry (calculated) Molecular weight 759.83 g/molcalculated from the IMA formula Composition (wt%) Pb 27.27%, Ca 10.55%, Zn 25.83%, Si 11.09%, O 25.27%
Classification Nickel-Strunz (10th) 9.AB.15Wikidata (CC0) Nickel-Strunz (9th) 9.AB.15Wikidata (CC0) Dana (8th) 51.2.1.3Wikidata (CC0)
