Primary Stone / Iolite

Gemstone: Iolite

Gemstone Family: Gem

Gemstone Count: 1

Carat Weight: 0.41

Gemstone Shape: Trillion

Primary Color: purple

Color: Purple

Treatment: No Known Treatment

Country of Origin: India

Composition: Natural

Dimensions: 5.13 x 5.12 x 3.48 mm

Iolite gemology
Species: cordierite
Color: Blue, violet, brownish
Chemical composition: Mg2Al4Si5O18 magnesium aluminum silicate
Crystal system: Orthorhombic, short prisms
Hardness: 7-7.5 (Mohs scale)
Specific gravity: 2.58 - 2.66
Refractive index: 1.542 - 1.578
Birefringence: -0.008 to - 0.012
Optical character:
Color of streak: White
Absorption spectrum: 645,593, 585, 535, 492, 456, 436, 426
Fluorescence: None