摘要
官山坡缕石矿物为典型的沉积成因,结晶程度低、化学成分较复杂,以富Fe_2O_3为特征。矿物在380～580℃热脱水过程中TG曲线近于连续,因此,推测其存在结晶水(OH_2)和结构水(OH)同时脱失的温度区域。X射线粉晶衍射数据中,矿物的(121)、(161)面网衍射不同程度地发生分裂,应属于单斜晶系,但单斜角β近于90°。矿物红外光谱特征和摩叶根标谱类似,只是由于Mg^(2+)、Al^(3+)等八面体阳离子占位率的变化引起部分振动频数的微小飘移。
The fibrous palygorskite, with poor crystallinity and complicated chemical: composition (abundant in Fe), from Guanshan, Anhui Province, is sedimentary in origin. Strong thermogravimetric evidence shows a temperature range (380～580℃)at which the water of different types(OH_2 and OH)has been lost simultaneously. At 20～850℃, the total amount of water lost is 24.10(wt.%) for G70-04 and 19.55 (wt%)for G70-01. The XRD data indicated the (121) and (161) reflections split. So it may be of monoclinic symmetry after C. L. Christ (1969), whose monoclinic angle is equal to 91° 12' for G70-04 and 92° 49' for G70-01. Because of difference in occupancy for Mg^(2+), Al^(3+) and Fe^(3+) in octahedral sheets, the mineral unit cell parameters and its I. R. frequency wavenumbers vary slightly from one sample to another.
出处
《矿物学报》
CAS
CSCD
北大核心
1993年第1期92-96,共5页
Acta Mineralogica Sinica
关键词
坡缕石
脱水
矿物学
沉积型
palygorskite
dehydrate
Guanshan
mineralogy
