Friedrich Mohs harder. This became the basis of the hardness scale developed by Mohs. The hardest mineral, diamond was given a value of 10 and softer minerals such as talc were given the very low value of 1 (unity). Other minerals were given intermediate values, depending on their ability to scratch another mineral in the scale. Thus gypsum was given the value 2 because it will scratch talc crystals, and calcite the value 3 because it will scratch gypsum. Minerals are also now classified by chemical characteristics, but the physical properties are still useful in field examination. In 1812, Mohs became a
Universalmuseum Joanneum collection traces its origin to the private collection of Archduke Johann, which encompassed several thousand pieces at that time. Today the inventory has grown to about 80,000 specimens. The collection presents minerals from across the world as well as a Styrian regional collection. The mineralogy department of the Joanneum was where Friedrich Mohs developed the Mohs scale of mineral hardness which remains authoritative. He was the first curator of the Joanneum. Schloss Eggenberg was added to the registry of the Graz Old Town as a UNESCO World Heritage Site in 2010. Schloss Eggenberg is the most significant palace ensemble in