The Vickers hardness test puts this mineral at a 48.

Then to test the hardness Vickers hardness test was used.

Besides pressure testing, shotshells containing steel pellets require an additional Vickers hardness test.

This is seen by looking at how long the indentation is along a certain direction (related to the indentations made with a Vickers hardness test).

Vickers hardness test (HV)

A superhard material is a material with a hardness value exceeding 40 GPa (gigapascals) when measured by the Vickers hardness test.

The material's primary properties are its strength, allowing thin glass without fragility, its high scratch resistance and its hardness - with a Vickers hardness test rating of 595 to 673.

The mechanical properties of iron and its alloys can be evaluated using a variety of tests, including the Brinell test, Rockwell test and the Vickers hardness test.

The Vickers hardness test VH1 must be below 100 but even so, steel is known to wear the barrel excessively over time if the pellets velocity becomes too high leading to potentially harmful situations for the user.

The Vickers hardness test was developed in 1921 by Robert L. Smith and George E. Sandland at Vickers Ltd as an alternative to the Brinell method to measure the hardness of materials.