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[Chemical composition] Na, Rb, and Cs are substituted for K. Li and Al are substituted for Fe 2+ , Mn, Ca, Mg, and Ti.
The data show that the Li content is proportional to the F content. Whether the muscovite and lithium mica are continuous series of similar images is still controversial. However, it has been found that the muscovite can enter 33% of Li 2 O without causing an essential change in the structure. Therefore, it is generally included in the lithium mica range when the Li 2 O content is higher than 35%. Lithium muscovite. In addition, iron- rich lithium mica can be regarded as a transition product of lithium mica-biotite. TOT type, three octahedron type.
[Crystal Structure] The crystal system, space group, and unit cell parameters vary depending on the type, see Table 21-6.
It can be seen from Table 21-6 that a 0 and b 0 are substantially unchanged, but the orientation is variable, but c 0 is increased by an integral multiple of 1, that is, it is related to the number of repeating layers. Lepidolite polytype 1M and 2M 2 mainly, followed by 3T, without having a common muscovite 2M 1 structure, lepidolite 2M 2 type structure is a transitional or mixed structure.
[Form, physical properties] often become a small scale-like assembly, so it is also known as scale mica. The color is rose, light purple.
[genesis and occurrence] is mainly produced in granitic pegmatite, and is symbiotic with feldspar , quartz , spodumene, muscovite and tourmaline .
[Uses] is one of the main raw material to extract the rare metal lithium. Lithium mica often contains Rb and Cs, so it is also the main raw material for extracting Rb and Cs. The fine aggregate can be used as a jade material (the process name is lilac purple). Due to its low hardness, it is easy to honed and polished. The finished product is smooth and radiant. It has a unique lilac purple color and is very soft. It can be used for jade. Jewelry inlays such as handicrafts and ring faces are well received at home and abroad. In addition, lithium mica, like spodumene, can be used in the ceramic industry, as described in spodumene.
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