The sclerometer (from the Greek skleros meaning "hard") is a mineralogist's (usually) instrument used to measure the hardness of materials.
The instrument is designed to determine the degree of hardness of a given mineral by applying pressure on a moving diamond point until a "scratch" has occurred.
Methods of hardness testing:
- Turner's Sclerometer
- Shore's Scleroscope
- Brinell's Test
- Keep's Test
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