![]() ![]() Talc is considered to be a clay mineral and when in powder form will often be mixed in with corn starch to create baby powder. Talc is soft enough to easily be ground into powder. It is used on the Mohs scale of hardness as the definition for 1, being the lowest and softest on the scale. Talc is the softest mineral known on earth. As you may know, chalk can be run across other surfaces and leave traces of chalk behind. This sedimentary rock can easily be dissolved or broken apart. For a great article on the rock cycle and the changes each of the 3 types of rocks go through, see my article “ Diagram of the Rock Cycle”.Ĭhalk is a great example of a very soft sedimentary rock. Many have heard of the rock cycle and there are some that have not. This means that the rock will be harder and more compact than softer sedimentary rock. Igneous and metamorphic rocks have undergone large amounts of pressure, heat, and transformation.
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