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Tag Archives: aluminum silicate mineral

Kyanite: The bridge of light

March 5, 2012

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by Karyn Diane Kish —  Kyanite is an aluminum silicate mineral that crystallizes as flat mica-like layers, forming elongated blades that can be twisted or straight. Its hardness ranges from 4.5 to 7, depending on the direction by which it is measured. In the past, cutting this stone for jewelry-making could be difficult. However, in […]

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