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碳氢钠石是一种无水碱金属碳酸盐矿物,最初发现于美国的绿河盆地。一九八二年,在我国河南省泌阳凹陷首次发现。该矿物的化学成分是Na_2CO_3和NaHCO_3,分子式是:Na_2CO_3·3NaHCO_3。该矿物晶体呈板状,无色透明,主要产在重碳钠盐组成的碱矿层中。经测试确定,该矿物属二轴晶负光性,主折射率:Ng=1.531,Nm=1.524,Np=1.435,2V=31.45°;晶胞参数:a=10.046,b=15.633,c=3.492,a=92°8′,β=95。42′,γ=108°34′;最强的粉晶衍射线有:3.70(35),2.97(100),2.67(41),2.213(60);主要的红外光谱吸收带是:2616,1692,1662,1359,1048,1018,839,677cm_(-1)。据碳氢钠石的产状和共生组合特征,该矿物产于富钠,高P_(CO_2)的碳酸盐型内陆盐湖,是较高温度条件下快速蒸发的产物。
Sodium bicarbonate is an anhydrous alkali metal carbonate mineral originally found in the Green River Basin in the United States. In 1982, it was first discovered in the Biyang Depression in Henan Province of China. The chemical composition of the mineral is Na_2CO_3 and NaHCO_3, the formula is: Na_2CO_3 · 3NaHCO_3. The mineral crystals are plate-like, colorless and transparent, mainly produced in the heavy carbon sodium salt composition of the base layer. It has been determined by testing that the mineral is a biaxial crystal with the main refractive index of Ng = 1.531, Nm = 1.524, Np = 1.435 and 2V = 31.45 °. The unit cell parameters are a = 10.046, b = 15.633 and c = 3.492 , a = 92 ° 8 ’, β = 95.42’ and γ = 108 ° 34 ’. The strongest powder diffraction lines are 3.70 (35), 2.97 (100), 2.67 (41) and 2.213 (60) ; The main infrared absorption bands are: 2616,1692,1662,1359,1048,1018,839,677cm _ (- 1). According to the occurrence and symbiosis characteristics of sodiumbite, this mineral is produced in sodium carbonate and high P_ (CO_2) carbonate inland salt lake and is the product of rapid evaporation at higher temperature.