| (documentation MohsScaleFn EnglishLanguage "(MohsScaleFn ?SUBSTANCE) returns a RealNumber between 0 to 10. The Mohs Scale of mineral hardness is a qualitative ordinal scale from 1 to 10, characterizing scratch resistance of minerals through the ability of harder material to scratch softer material. The scale was introduced in 1812 by the German geologist and mineralogist Friedrich Mohs. Diamond was the hardest known naturally occurring mineral when the scale was designed, and defines the top of the scale, arbitrarily set at 10. Each of the ten hardness values in the Mohs scale is represented by a reference mineral, most of which are widespread in rocks. Some substance have a hardness between two of the Mohs scale reference minerals.The hardness of a material is measured against the scale by finding the hardest material that the given material can scratch, or the softest material that can scratch the given material. For example, if some material is scratched by apatite but not by fluorite, its hardness on the Mohs scale would be between 4 and 5. [Wikipedia]") |
Mid-level-ontology.kif 10598-10608 |
Mohs Scale is an instance of unary function |
MohsScaleFn