我国某金伯利岩管中混型金刚石的紫外形貌和光谱特征
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Ultra-Violet Photographs and Spectral Characteristics of Mixed Type Diamonds in a Kimberlite Tube in China
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    Mixed type diamonds occur in porphyritic Kimberlite tube in China. It a- mounts to 6% of the total diamonds yield. Mixed type crystal of diamond is composed mainly of type I molecules and a less amount (about third to fif- th of the crystal) of type I molecules. The crystals are colorless, transparent and small octahedra (most sized mm).On the ultra-violet transparent pho- tographs, within the crystal, shows small black area of opacities, and outside of this area shows white area transparent under emissive ultra-violet light (wa- velenth 2370A).On the ultra-violet spectrogram, absorption edge of the black area is between 2916A—2970A,but the white area transmits ultra-violet light beginning at 2230A,Its representing forbidden band width is 5. 51 ev. On the infrared spectrogram, the black area shows strong absorption at 1175,1282, 1370 cm-1 and week absorption at 1100 cm-1 that they were lead. by rich, bi- nitrogen and poly-nitrogen; But the white area have no absorption peak lea- ding by impurities of nitrogen. Therefore, in a mixed type diamond, local small black area marks type , I,and vast white area indicates type II.

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范良明,杨永富,闻辂,1984,我国某金伯利岩管中混型金刚石的紫外形貌和光谱特征[J].岩石矿物学杂志,3(4):339~344.,1984,Ultra-Violet Photographs and Spectral Characteristics of Mixed Type Diamonds in a Kimberlite Tube in China[J]. Acta Petrologica et Mineralogica,3(4):339~344.

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