Andalusite is a polymorph with two other minerals, Kyanite and Sillimanite. 紅柱石屬多晶型物，含藍晶石和硅線(xiàn)石兩種不同礦物。
Some Andalusite crystals have carbonaceous inclusions, arranged so that in cross-section they form a dark cross. 某些紅柱石晶體含有碳質(zhì)包裹體，正是這種結構導致了她的橫截面有一個(gè)黑十字。
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