cool crystals

quartz is one of the gems, crystals I don't know but I find it very often but there are still many types of gems hiding around they are quite good looking for any collection (if it is polished) one is worth RM2.50 or so I've been told

A pearl is a hard object produced within the soft tissue of a living shelled mollusc. Just like the shell of a clam, a pearl is composed of calcium carbonate in minute crystalline form