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This listing is for one large black Kyanite blade/fan similar to those pictured (and sold previously) from Minas Gerais, Brazil. Each cluster is 3-4" in size and weighs 38-100+ grams. These fine blades would be ideal for jewelry making or wire wrap, crafts, or many other projects. We can also provide different sizes or quantities according to your needs - feel free to contact us with your requests. Link to Our Other Crystal and Mineral Specimens
KYANITE PROPERTIES:
Kyanite is one of the index minerals that are used to estimate the temperature, depth, and pressure at which a rock undergoes metamorphism.Color: Blue, white, rarely green, gray, yellow, pink, orange, and black, can be zoned.
Crystal habit: Columnar; fibrous; bladed.
Crystal system: Triclinic.
Twinning: Lamellar.
Cleavage: perfect; imperfect with 79° angle between.
Fracture: Splintery.
Tenacity: Brittle.
Hardness: 4.5-5 parallel to one axis; 6.5-7 perpendicular to that axis.
Luster: Vitreous to pearly.
Streak: White.
Diaphaneity: Transparent to translucent.
Specific gravity: 3.53 - 3.65 measured; 3.67 calculated.
Courtesy of Wikipedia
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