© 1998 by Udo J.A. Behner
© 1998 by Udo J.A. Behner
| chemical formula | : K2Cr2O7 |
| crystal class | : triclinic pinakoidal |
| growing method | : slowly cooling of the aquaeous solution |
| growing time | : app. 10 days |
| crystal size | : up to 3 centimeters |
Potassium dichromate is doubtless one of the most beautifull
lab growns on the market. However in spite the facts that it so
pretty its toxic and cancerogen potential is some draw back. The
literature states its only dangerous if dust is inhaled over a
long time or larger amounts of the compound are ingested. So far
the crystal grower should take care when handling the salt and
the solution, the owner of a specimen may be not in such a severe
danger of getting harmed.
However potassium dichromate is not a kids toy.
The solubility of potassium dichromate increases strongly with
higher temperatures but its solubility at room temperature is
only low, so far the evaporation process gives only poor results.
But also the slowly cooling process needs some skill to produce
extraordinary specimen like this.
This specimen is currently exhibited at the mineral museum in
Pforzheim