块云母类似云母的灰色、绿色或棕色矿物，由其它矿经化学变化形成，如堇青石。
A gray, green, or brown mineral similar to mica, formed by chemical alteration of other minerals, such AS cordierite.
块云母类似云母的灰色、绿色或棕色矿物，由其它矿经化学变化形成，如堇青石。
A gray, green, or brown mineral similar to mica, formed by chemical alteration of other minerals, such AS cordierite.
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