mineral
Kyanite (or Tremolite)
Al2SiO5 (Kyanite)
AI-generated identification · may be incorrectHardness 4.5–7 (anisotropic), bladed or elongated habit, pearly to vitreous luster, light blue-grey to white color, and perfect cleavage.
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Physical properties
Hardness 4.5–7 (anisotropic), bladed or elongated habit, pearly to vitreous luster, light blue-grey to white color, and perfect cleavage.
Formation & geological history
Forms under high-pressure regional metamorphism of clay-rich sedimentary rocks or pelitic schists.
Uses & applications
Used in high-temperature refractory materials, spark plugs, ceramics, and as mineral collector specimens.
Geological facts
Exhibits distinct anisotropic hardness—it is much softer parallel to its length (4.5–5) than perpendicular to it (6.5–7).
Field identification & locations
Identified by bladed crystal habit, direction-dependent hardness, and fibrous/bladed structure in metamorphic terrains.
