TEST IZDELEK
Brazil
◆ Unique Specimen — one of a kind
0,10 €
Striking black kyanite fan cluster from Brazil. A naturally formed blade-like crystal with the characteristic anisotropic hardness that makes kyani...
Description
One of mineralogy’s most remarkable specimens: kyanite is famously anisotropic, displaying a hardness of 4.5–5 along the crystal axis and 6.5–7 across it — a physical property that has fascinated collectors and scientists for over a century. This black variety is rich in iron, lending it its deep, opaque coloration and distinctive metallic sheen.
The blade-like crystal habit is characteristic of kyanite, with natural striations running along the length of each crystal. The matrix presents a fan-like cluster of these blades, creating a striking sculptural form. All surfaces are natural, untreated.
- Mineral
- Kyanite (iron-rich variety)
- Locality
- Brazil
- Size
- ~8 × 5 cm
- Weight
- 185 g
- Formula
- Al₂SiO₅
- Crystal System
- Triclinic
- Hardness
- 5.5 – 7 Mohs
- Specific Gravity
- 3.53–3.67
- Luster
- Vitreous to pearly
- Condition
- Natural, untreated
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