A Comment on the Difference between Pianlinite and Metakaolinite—— On " The Existence of Allophane Heated Metakaolinite"in Acta Mineralogica Sinica
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摘要: 《矿物学报》１９９５年第４期发表了何宏平的“天然烧变高岭石中水铝英石发现”一文。该文用核磁共振谱中－７９.０×１０－６附近的谱峰，认为该信号来自水铝英石，而不是来自Ａｌ－Ｓｉ尖晶石。这种说法较合理，因刘长龄早就阐明偏岭石在成岩阶段由水铝英石变来。但是我们不同意“天然煤烧变高岭石经后期水化作用变成水铝英石”的观点，而主张“水铝英石是沼泽相原生沉积的；在成岩作用中转变为偏岭石不是煤烧的，有一些理化性质与变高岭石的不同”Abstract: The paper "The Existence of Allophane Heated Metakaolinite" was published by He Hongping et alin No4 of Acat Mineralogica Sinica, 1995.In the paper, the author thought that the spectrum peak ar-round -79.0 × 10- 6of M ASNMR spectra was originated from allophane, not from Al-Si spinel.This opin-ion is relatively rational because Liu Changling had stated that pianlinite originated from allophane dur-ing diagenetic stage.Howeuer, we don't agree with the opinion that heated kaolinite became allophanethrough late hydration, we think allophane is originally deposited in swamp;during diagenesis it changesinto planlinite, thus pianlinite is not formed by coal combustion, Some of its physical and chemical prop-erties are different from that of metakaolinite.
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Key words:
- pianlinite /
- metakaolinite /
- allophane /
- nuclear-magnetic-resonance (MASNMR) /
- qua-sicrystal
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