Spiruna's Black Crystal

I need to meet Spiruna, who lives in a small house in Orbis Park. Spiruna promised to tell me everything that she knows, as long as I find the Black Crystal that she lost in the snowfield while on a search for some materials for spells. Now where in the snowfield must that be... I found a snow-covered rock in the snowfield. Could the Black Crystal be somewhere around here

Part of: In Search of the Book of Ancient