Mohs Hardness Scale,teaching tool

Mohs Hardness Scale,teaching tool is that of a standard mineral hardness. In 1824 by the German mineralogist Moss (Frederich Mohs) the first place. Application of the scratch method pyramid-shaped diamond pin test described by the occurrence of mineral scratches the surface, the habit or mineralogy are used gemmology Mohs hardness. Measured by the depth of the scratch 10 minutes to express hardness: talc (talc) 1 (hardness minimum), gypsum (gypsum) 2, calcite (calcite) 3, fluorite (fluorite) 4, apatite (apatite) 5, orthoclase (feldspar; orthoclase; periclase) 6, quartz (quartz) 7, topaz (topaz) 8, corundum (corundum) 9, Diamond (diamond) 10. Mohs hardness is also used to indicate the hardness of other solid materials. Diamond that is Diamond, Mohs hardness of 10 Specimen size(L x W x H)is 0.78inch x 0.4inch x 0.4inch Box size is(L x W x H)5.2inch x 2.8inch x0.9inch it is useful for teaching tools