Mohs Hardness Scale | Geology Page
The hardness test developed by Friedrich Mohs was the first known test to assess resistance of a material to scratching. It is a very simple but inexact comparative test. Perhaps its simplicity has enabled it to become the most widely used hardness test. Since the Mohs Scale was developed in 1812, many different hardness tests have been invented.Aggregate Hardness Map of the United States | For,,Jul 23, 2012· The following minerals are used as standards: 1 Talc, 2 Gypsum, 3 Calcite (soft limestone), 4 Fluorite, 5 Apatite, 6 Feldspar (some river rock, some type of granite), 7 Quartz (some river rock,Geology Fundamentals: Identifying Igneous Rocks in the,,Mar 01, 2021· Talc has a hardness of 1, and diamond has a hardness of 10. Mohs hardness scale is very useful for identifying minerals in the field. Common objects like a copper penny (3), glass plate (5.5), or a fingernail (2-2.5) can be used to measure mineral hardness in the field and further determine a rock’s mineral assemblage. Table 1.