Iolite
Iolite is a mysterious gemstone that exhibits "trichroism," showing different colors depending on the angle of light. Its blue-violet transparency evokes a sense of tranquility and intelligence, making it an elegant and unique choice for jewelry.
Blue-violet Iolite
Basic Information
| Chemical Formula | (Mg,Fe2+)2(Al2Si)[Al2Si4O13] |
|---|---|
| Classification | Orthorhombic system |
| Hardness | 7–7.5 (Mohs hardness) |
| Specific Gravity | 2.65 (53–78) |
| Crystal Habit | Columnar crystals, twinning present |
Characteristics
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Trichroism: An important characteristic useful for identifying Iolite. It can be confirmed using a tool called a "dichroscope."
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Etymology: "Iolite" means blue stone. In mineralogy, it is called "Cordierite" (named after French geologist Pierre Louis Antoine Cordier).
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Color Variations: Purple-blue Blue Colorless (rare)
Varieties & Aliases
- Alias Dichroite: Derived from its pleochroic properties.
- Variety White Cordierite: Colorless Iolite (iron-free).
- Variety Bloodshot Iolite: Meaning "flash of blood."
- Variety Cat's Eye / Star Iolite
- Alias Water Sapphire
Related & Similar Stones
Similar Stones
Blue Sapphire
Tanzanite
Related Stones
- Sakura-ishi (Cherry Blossom Stone): Found in mica hornfels. Pseudomorphous.
- Kanko-seki: Stone associated with Sugawara no Michizane.
Note: Both color orientation and cut orientation must be taken into account.