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online 2570-7345

Waylandit a petitjeanit, dva nové fosfáty pro lokalitu Cetoraz u Pacova (Česká republika)

Waylandite and petitjeanite, two new phosphates for locality Cetoraz near Pacov (Czech Republic)


Klíčová slova

Abstrakt

Association of the supergene phosphate minerals within quartz fissures on the quartz-wolframite sample from the locality Cetoraz near Pacov, Czech Republic was studied. The most abundant supergene phosphate is waylandite, which occurs in two types. Waylandite I is Bi and Fe depleted and enriched in Ca, Pb, W, F and P with average composition (Bi0.54Ca0.24Na0.02Pb0.02)∑0.82(Al2.87Fe0.20)∑3.07[(PO4)2.07(SiO4)0.02(WO4)0.01]∑2.10(OH)4.88F0.21. Waylandite II is closer to ideal formula with average composition (Bi0.92Ca0.11K0.01)∑1.04(Al2.65Fe0.38)∑3.04[(PO4)1.87(SiO4)0.08(SO4)0.01]∑1.96(OH)6,23.  Waylandite is accompanied by the less abundant petitjeanite, which is very close to its ideal formula with average composition (Bi2.85Ca0.11Fe0.03Al0.01)∑3.00[(PO4)1,92(SiO4)0.09]∑2.01O(OH)0.77. Remaining space in fissures is filled with the limonite. Unknown late Bi-Fe-W-O phase was observed as grains in tiny fissures of the limonite. Another unknown Bi-W-O phase was observed inside the tiny vugs and fissures in the quartz and wolframite. These supergene phases originated from the primary wolframite-apatite-bismuth-scheelite mineralization.

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