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Sillimanite ct.4.89



103,70 €

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Sillimanite ct.4.89

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SILLIMANITE Is an Aluminum Silicate with formula Al2 SiO5 .Is also polymorph with two other minerals: kianite and andalusite. A polymorph is a mineral that shares the same chemistry but a different crystal structure with another, or other, minerals. Sillimanite is the rarest of the three trimorphs. The hardness is about 7-7.5 of the Mohs scale. This stone is almost colourless slightly grey-blue, clean.From India. Size:11x8.6x7.2 mm. Weight: 7.89 ct. CODE#1872