Crocidolite, (blue asbestos,) alters to quartz, but while retaining its fibrous structure. This material is frequently stained by iron, giving it a golden brown color. We know this material as tiger's eye. Unstained pieces, retaining their original blue color, are called Hawk’s Eye. There are also pieces with both colors.
Metaphysical Properties of Tiger's Eye - Blue: Throat Chakra - Calm & Relaxation, Reduce Anxiety, increase clarity and focus, Insight into struggles, Universal Truth, Go with the Flow, increase psychic awareness, Honesty & Integrity, Confidence & Willpower, Grounded