This is a crystal that is in the wall near Lake Nemo, the crystal is a gypsum
 crystal named Selenite. Priest's Grotto is filled with crystals of several different
chemical compositions, but they are all gypsum crystals.  Sometimes they
contain magnesium that makes the crystals appear black.  Others like this one
contain moisture and they appear Amber. When a piece of the amber crystal
is heated the water evaporates and it becomes clear.



www.UAYCEF.org - Ternopol-Podilskyi Ukraine Trip -- -- Priest's Grotto, Aug 2003