Here's why:

* Hardness: Talc is the softest mineral on the Mohs Hardness Scale, with a rating of 1. This means it can be scratched easily by your fingernail.

* Color: Talc can range in color from white to green, but it's often found in a dark gray or greenish-gray shade.

Important Note: While talc is a common candidate, it's crucial to remember that mineral identification should ideally be done by a professional geologist or mineralogist using various tests and tools.