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1955年在苏联发现。物理性质晶形为假六方板状,呈薄膜状(?)贝壳状集合体,很少遇到极小的晶体(约0.01—0.03mm)(图69)。沿(001)解理完全。颜色为亮黄色,硬度低,接近于2。比重3.644。在
Found in 1955 in the Soviet Union. PHYSICAL PROPERTIES The crystal form is a fake hexagonal platelet that is in the form of a thin-film (?) Shell-like assembly that rarely encounters very small crystals (about 0.01-0.03 mm) (Figure 69). Cleavage along (001) is complete. Bright yellow color, low hardness, close to 2. The proportion of 3.644. in