瑪瑙
瑪瑙，石英類礦物也，與玉髓同質，時有赤、白、灰各色相間，成平行層，多圓形，常中空，水晶簇生其中，品類甚多，中國有之。生南方者，色正紅而無瑕。生西北者，色青黑，謂之鬼面青，間以紅色如蛛絲者為妙。上有枝葉儼如柏枝者，曰柏枝瑪瑙。黑白相間者，曰金子瑪瑙。質理純黑，中間白綠者，曰合子瑪瑙。正視之，瑩白光彩，側視之，若凝血者，曰夾胎瑪瑙，最珍。
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