LOT 384 天然玛瑙原石一组(3 件)
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重量:546g
玛瑙也作码瑙、马瑙、马脑等,是玉髓类矿物的一种,经常是混有蛋白石和隐晶质石英的纹带状块体,硬度6.5–7度,色彩相当有层次,古人常常将其粉碎、研磨,添加溶剂成分,制成矿物颜料,用来作画。亦可入药。玛瑙通体表面平坦光滑,玻璃光泽,有的较凹凸不平,蜡状光泽。无臭、味淡,质轻,硬而脆,易击碎,断面可见以受力点为中心的同心圆波纹,似贝壳状,具锋利棱角,可刻划玻璃并留下划痕,迅速磨擦不易热。
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2024.7.26-2024.8.5
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线上
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