© 1998 by Udo J.A. Behner
© 1998 by Udo J.A. Behner
| chemical formula | : NH4H2PO4 |
| crystal class | : tetragonal skalenoedric |
| growing method | : slowly cooling of the aquaeous solution |
| growing time | : app. 7 days |
| crystal size | : up to 10 centimeters |
Here the ADP contains an extreme high amount of chromium which
results in an almost emerald like color (which is no wonder as
chromium is the coloring agent in emerald, too !).
Solutions with such a high chromium content tend to produce
extreme needle shaped crystals. If that happens its almost
impossible to get such a solution back to "normal".
This specimen is currently exhibited at the mineral museum in
Pforzheim.