Bulletin Mineralogie Petrologie

Vrtiška Luboš, Sejkora Jiří, Dolníček Zdeněk, Malíková Radana

Ročník 30, číslo 1 (2022), strana 1-10

DOI: https://doi.org/10.46861/bmp.30.001

collinsite, messelite, phosphates, chemical composition, powder X-ray diffraction data, unit-cell parameters, Raman spectra, iron deposit, Nučice, Czech Republic

A very rare phosphate collinsite was found on historical samples of chamosite from the abandoned iron mine Nučice near Prague, Central Bohemia (Czech Republic) located in Ordovician sediments of the Barrandian area. Collinsite   forms white to beige radial aggregates up to 15 mm in size composed by platy crystals with pearly lustre. Its chemical composition corresponds to empirical formula: (Ca_1.87Sr_0.12Ba_0.01)_Σ2.00(Mg_0.57Fe_0.41Al_0.01)_Σ0.99 (PO₄)_2.00·2H₂O (Sr-rich zones) and (Ca_1.98Sr_0.01)_Σ1.99(Mg_0.58Fe_0.40Al_0.01)_Σ0.99(PO₄)_2.00·2H₂O (Sr-poor zones). Collinsite is triclinic, space group P-1, unit-cell parameters refined from X-ray powder diffraction data are a 5.734(3), b 6.779(3), c 5.441(2) Å, α 97.33(4)°, β 108.52(3)°, γ 107.25(3)° and V 185.7(1) ų. Collinsite was found in association with siderite in fissures of chamosite iron ore.

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