Physical property tests can be extremely helpful in determining the composition of an unknown mineral. Utilizing such established tests as the Moh's hardness scale, streak tests, cleavage, and luster, individuals can compare what they see to catalogued data to try to determine the origin of an unknown mineral. In some examples such as halite and magnetite, these physical diagnostic tests can be enough to completely establish the identity of the mineral, while in many others they simply present a starting place to work from. Table 1 shows the collected physical properties of the unknown mineral compared to those that are previously known for axinite. One of the more determining tests in this case was the dichroism in the color of the mineral - that is the changing of the mineral from purple to green as the viewing angle changed, caused by different levels of light absorption along distinct axes.