docAnkangite from the Monte Arsiccio mine (Apuan Alps, Tuscany, Italy
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Icosahedral coordination of phosphorus in the crystal
occur as ten-coordinated as, for instance, in the synthetic Co2P
(Rundqvist 1962), but higher coordination-numbers for P atoms
are unknown in nature. On the contrary, a similar coordination
to that...
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Color pale rose, luster dull, streak white, II. 1.5-2. Cleavage {001}, fair. Optically biaxial, positive, rn a 1.750,p L.766,7 1.85 = 0.O2,2V 48", X - a. Z : b.
The mineral occurs in alkalic rocks ...
the Scanned PDF
The mineral occurs as prismatic grains, up to0.22mm in diameter, intergtown with
microcline, quartz, ilmenite and fluorite. Crystals in microcline are surrounded by dark
red and brown aureoles. Wol...
