Progress in Earth and Planetary Science

Table 1 Chemical composition of points in particle in Fig. 8

From: Magnesium silicate chimneys at the Strytan hydrothermal field, Iceland, as analogues for prebiotic chemistry at alkaline submarine hydrothermal vents on the early Earth

Cation	1	2	3	4	5	6
Si	3.80	3.85	4.37	3.76	3.82	3.96
Al	0.16	0.16	0.96	0.49	0.28	0.18
Mg	3.11	2.99	0.38	2.53	2.87	2.76
Fe(III)	0.00	0.01	0.02	0.00	0.00	0.00
Na	0.00	0.00	0.49	0.14	0.00	0.00
K	0.00	0.01	0.19	0.03	0.00	0.01
Ca	0.05	0.04	0.06	0.13	0.06	0.04

Chemical analysis was converted to cations on the basis of O₁₀(OH)₂. Analyses 2, 4, and 5 are compatible with Mg smectites

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