grey or green or brown mineral similar to mica and containing aluminum and potassium sulphates
pinite详细解释
pin.ite n.（名词）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 来源：After Pini , a mine in Saxony 源自 比尼 ，萨克森州的煤矿
