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