measured	value	unit
[SiO₂]	49.6	%
[TiO₂]	0.45	%
[Al₂O₃]	30.6	%
[Cr₂O₃]	0.76	%
[FeO^T]	1.39	%
[MgO]	0.92	%
[Na₂O]	0.32	%
[K₂O]	11.2	%

tables:

Table 2. Chemical compositions of mica. With the exception of boron, abundances of elements are normalized to a total of 100cg/g of Ota, Tsutomu (2019) Tourmaline in a Mesoarchean pelagic hydrothermal system: Implications for the habitat of early life, Precambrian Research, 334. more