
Aluminum, calcium and sodium silicate crystallizing in the tetragonal system
General Physical properties: hardness 5.5 to 6 - density 2.63 g/cm3 - refractive indexes 1.544 and 1.560
Due to the low hardness, it is cut as gem only for collecting purposes
- Weight: 0.54 Kt
- Size 7.5 x 5.20 x 2.50 mm
- Cut: mix, drop shape
- Color: light violet
- Purity: slightly included
- Treatments: none
- Origin: Brazil