measured	value	unit
[SiO₂]	36.84	%
[Al₂O₃]	33.15	%
[Cr₂O₃]	0.54	%
[FeO]	7.49	%
[MgO]	5.32	%
[Na₂O]	2.4	%

tables:

SA1.Major Element Abundances of Tourmalines (tour-31 - tour-40), determined by FESEM-EDX (continued) of Van Kranendonk, Martin J. (2021) Elements for the Origin of Life on Land: A Deep-Time Perspective from the Pilbara Craton of Western Australia, Astrobiology, 21, 39-59. more
Table 2. B-isotope abundances of Tourmalines of Van Kranendonk, Martin J. (2021) Elements for the Origin of Life on Land: A Deep-Time Perspective from the Pilbara Craton of Western Australia, Astrobiology, 21, 39-59. more