黑色，有光泽，硬度比白刚玉高，韧性较低。
Black colour, its hardness is higher than that of WA, its toughness is a bit lower.
以不同深度腺体层作为对照可获得不同的硬度比；
The stiffness of the lesions were different with different level glandular tissue as reference.
根据莫氏硬度表，人类牙齿的硬度比黄金大但比黄铁矿小。
Human teeth are harder than gold but softer than pyrite, according to the Mohs Hardness Scale, which categorizes how easily minerals scratch.
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