Completely revised new edition 2008!

A find! Magnificent rock crystals – fresh from the mountain. Luckily, they were embedded in the clay of the fissure and therefore remained undamaged. The clay is quickly washed away with a water jet and a root brush, but a stubborn coating of iron oxides obscures all their splendor and beauty… This workbook was developed by two collecting scientists directly from their practical experience and compiled over many years. Every method is based on precise findings, every recipe has been tested extensively. The tables ensure that the correct method is used for each mineral. But it's not just about cleaning. Some minerals are not found on the Earth's surface – in "our" world – and must be prepared and preserved to retain their beauty. This workbook is a helpful guide for all the important questions.