Found in the aplitic zone of a zoned P-bearing granitic pegmatite exploited for feldspar for the ceramics industry. An alteration product of primary phosphates. Dimorphic relationsh ip with mangangordonite, and the Al-do
Approved IMA 1999 (Dana # Added)
Silbergrube quarry, Waidhaus, Upper Palatinate (Oberpf�lzer Wald), Bavaria, Germany. Link to MinDat.org Location Data.
Named after J�rgen Kastning (b. 1932), from Reinbeck bei Hamburg, Germany, amateur mineralogist specializing in phosphate minerals, who discovered the mineral.