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一、概述本文研究的黑云母(少铁黑云母Meroxen),颜色为黑褐色,折射率Ng=1.6112,光轴角(-)2V=4°,色散V>γ.其化学成分(重量%)如下:SiO_2 36.95,Al_2O_3 16.69,Fe_2O_3 1.94,FeO6.37,MgO 20.22,CaO 0.14,Na_2O 0.45,K_2O 9.63,H_2O~+ 3.96,H_2O~- 0.68,TiO_2 2.38,P_2O_5 0.12,MnO O.12,F 0.62,总和为100.27.晶体化学式为:(K_(0.90)Na_(0.06)Ca_(0.01))_(0.97)(Mg_(2.21)Fe_(0.39)~(2+)Fe_(0.11)~(3+)Mn_(0.01)Ti_(0.13)Al_(0.15))_(3.00)(Si_(2.71)Al_(1.29))_(4.00)O_(10)(O_(1.23)OH_(0.62)F_(0.15))_(2.00).从常温到1500℃,每隔100℃,在高温炉内加热一个样品,恒温一小时后取出淬火.对加热后的样品分别作了肉眼及光性鉴定,其中折射率用油浸法,光轴角用弗氏台干涉图法测定.
I. Overview The biotite (less iron mica Meroxen) studied in this paper is dark brown with a refractive index of Ng = 1.6112, optical axis angle (-) 2V = 4 ° and dispersion V> γ. Its chemical composition As follows: SiO 2 36.95 Al 2 O 3 16.69 Fe 2 O 3 1.94 FeO 6.37 MgO 20.22 CaO 0.14 Na 2 O 0.45 K 2 O 9.63 H 2 O + 3.96 H 2 O 0.68 TiO 2 2.38 P 2 O 5 0.12 MnO 0.12 F 0.62 , The sum is 100.27. The chemical formula of the crystal is: (K_ (0.90) Na_ (0.06) Ca_ (0.01)) ______________________________________ 0.97 Mg_ 2.21 Fe 0.39 Fe 2+ 0.11 ~ Mn 0. 01 Ti 0.13 Al 0.15 0.15 3.00 Si 2 2.71 Al 1.29 4.00 O 10 O 1.23 OH 0.62 F 0.15 _ (2.00) from room temperature to 1500 ℃, every 100 ℃, heating a sample in a high temperature furnace, heated for one hour and then quenched out of the heated samples were made macroscopic and photometric identification, wherein the refractive index of the oil immersion Method, optical axis angle with Freescale interferometry determination.