Indicolite – a captivating blue variety of the tourmaline mineral, belonging to the large borosilicate group. It is renowned for its rich hues, ranging from deep indigo-blue to vibrant blue-green. Its profound color can sometimes resemble aquamarine or the famous Paraiba tourmaline, yet Indicolite possesses its own unique character and beauty.
The name "Indicolite" originates from the indigo color, accurately conveying the characteristic blue hue of this precious gemstone. Some specimens can exhibit astonishing variations, including zones of yellowish or pinkish tints, or even white bands, which adds to their individuality and collector's value. This relatively rare member of the tourmaline group is mined in a limited number of locations worldwide.
The most famous deposits are found in Brazil, Nigeria, Mozambique, Afghanistan, and the USA. Indicolite typically forms in granitic pegmatites, but it can also be found as rounded pebbles in alluvial deposits, where it ends up as a result of erosion.
Due to its appealing appearance, rarity, and good hardness, Indicolite is highly prized by both mineral collectors and jewelers. It lends itself beautifully to cutting in various shapes, without losing its luster and depth of color. Exquisite jewelry pieces – rings, pendants, earrings, and necklaces – are crafted from Indicolite, highlighting its natural elegance.
Physical properties
Chemical formula
Na(Li,Al)₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₄ (approximate formula for Elbaite, to which Indicolite belongs)
Hardness
7 - 7.5
Crystal system
Trigonal
Transparency
Transparent to translucent
Luster
Vitreous
Color
Blue, greenish-blue, indigo-blue; sometimes with zones of yellow, pink, or white
Specific gravity
3.02 - 3.26
Jewelry with this mineral
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