The Singing Crystals are unique to Stranglethorn, and are very valuable to certain parties.  I can move those crystals, but the cursed Venture Company makes it hard for an honest entrepreneur like myself to gather any!$B$BI'd like to hire you.$B$BThe basilisks in Stranglethorn eat the crystal.  This gives them their hardened skin, and sometimes decent quality crystal can be harvested from it.$B$BYou can get it from any basilisk, but the less nasty ones are along the shores south of Zul'Kunda, to the north.