First, the composition and structure
K (LiAl) 3 [AlSi 4 O 10] (OHF) 2, often containing Na and Rb, Cs and the like dilute alkali metal element. The lithium mica produced in the Fuxin granitic pegmatite in Liaoning contains Li 2 O4.51%, SiO 2 50.40%, Al 2 O 3 23.22%, K 2 O10.33%, Rb 2 O1.57%, Cs 2 O0 .08%, MnO2.17%, F7.51%. The mineral is a monoclinic system.
Second, the materialized nature
The crystal has a plate shape along (001) and has a pseudo-hexagonal outline, often a scaly or leaf-like aggregate. Lithium (001) is extremely complete, the sheet is elastic, the hardness is 2 to 3, the relative density is 2.8 to 2.9, rosy, light purple, white, sometimes colorless, glass luster, cleavage surface pearl luster. The mineral is soluble in H 3 PO 4 and is incompletely dissolved in HCl, HNO 3 , H 2 SO 4 . Due to the inclusion of Li, the blowpipe flame is red.
Third, the identification features
Lithium mica is easily recognized by its color, flaky crystal form and mineral symbiosis. Light-colored lithium mica is similar to muscovite and can be accurately identified by flame reaction.
Fourth, the birthplace and origin
Lithium mica mainly produces granitic pegmatite, which is symbiotic with quartz , feldspar , muscovite, spodumene, beryl and tourmaline . Mica is also produced in the lithium-rich Li, Rb, Cs, Nb, Ta granite, quartz, albite, topaz, wolframite, tantalum, niobium, iron ore and other symbiotic. Lithium mica fine particle aggregate-lithium mica rock, called lilac purple jade, is a new jade found in China in the 1970s. The granitic pegmatite containing lithium mica is produced in Xinjiang Altai and Henan Guanpo, and the Lithium-containing mica granite is produced in Yichun, Jiangxi.
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