kyanite cabochons 8mm
- 8110931
- 35
- Regular Price: £6.90 exc.VAT
- Special Price: £5.52 exc.VAT
These are a lovely navy blue with a silvery reflective feature
Kyanite has directional hardness (it's harder in some directions, softer in others) and also easy cleavage; it can chip or cleave easily.
Hardness (vs abrasion/scratching) 7/10 - 5/10
Toughness (resistance to fracture) fair to poor
Stability (resistance to chemicals, UV etc.) good