the.com/kyanite
the crystal that fights itself, hard one way and soft the other
means Kyanite is a blue-to-gray aluminum silicate mineral, prized in heat-resistant ceramics and as a gemstone, famous for being notably harder along one crystal axis than across it.
from From the Greek 'kyanos,' meaning dark blue — the same root that gives us 'cyan' — a nod to the stone's signature streaky blue color. The mineral was named in the late 18th century, and an older spelling, 'cyanite,' wore that Greek blue even more openly.
- split personality
- hardness varies by direction on same crystal
- name origin
- from Greek kyanos, meaning deep blue
- heat trick
- transforms into mullite for spark plugs and porcelain
- pressure clue
- its presence tells geologists rocks were deeply buried
- blade shape
- grows as flat elongated crystals like stone splinters
for instance
kyanite deposits in nepal — metamorphic mineral mined in the himalayas, valued for refractory ceramics and industrial abrasives