Part of determining what mineral you are observing in the field is being able to test, analyse and understand a mineral samples hardness, for example, by using the ‘Mohs Scale of Hardness’ talc is a very soft mineral, this can be determined on the scale by simply scratching a potential hand sample with your finger nail, however, corundum is much harder, and can only be scratched by a steel nail. Items in this category will enable you to test the geophysical hardness of hand samples you observe and include engineer scribers and tungsten carbide scribers.
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