Refraction Index: 1.522 - 1.578 Hardness: 7 - 7.5 Species: Cordierite Specific Gravity: 2.53 - 2.78 Treatment: None Care: Wash with soapy water. Avoid harsh detergents. Never clean ultrasonically or steam clean.
Iolite cabochons are a beautiful transparent blue violet gemstone. Iolites name comes from the Greek word for violet. It has also been called "water-sapphire". Iolite is sometimes used as an inexpensive substitute for sapphire.
Metal Clay, safe to fire at some temperatures. Test results; Silver 1200F-1HR-OK, Silver 1475F-1HR a little darker, Silver 1650F-2HR Metallic, Bronze 1525F-2HR OK, Copper 1778F-30min color change to lavender.