measured	value	unit
[SiO₂]	50.1	%
[TiO₂]	0.18	%
[Al₂O₃]	31.5	%
[FeO^T]	0.39	%
[MgO]	0.37	%
[Na₂O]	0.47	%
[K₂O]	7.87	%
[BaO]	4.43	%

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