天然碱是一种蒸发盐矿物，为水合碳酸氢钠。它呈纤维状或柱状块，灰或黄白色或无色。具有玻璃光泽。在盐湖沉积地带和干旱地成盐霜状出现。一些地方会形成大面积的碱荒漠。
n. trona
misc. urao ; tronite trona
给出了又一种天然碱碳酸化相图及相图分析。
This paper provide another method to phase diagram of trona carbonation and phase diagram analysis.
碱湖矿层剖面上，天然碱与芒硝呈互为消长关系，天然碱和石盐则呈正相关。
Trona is negatively correlated with mirabilite in the mineral bed sections of soda lakes. Trona and halite show a positive correlation.
该公司还通过从事非经营的合资企业和各种煤炭，天然碱（天然纯碱），工业矿物开采矿物质。
The company also engages in the hard minerals business through non-operated joint ventures and royalty arrangements in various coal, trona (natural soda ash), and industrial mineral mines.
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