A visual representation of the chemical composition of rocks from the Christiania region and lavas of the Caucasus
Abstract
A series of successive improvements in the precise representation of the chemical composition of rocks has shown how to find the figurative point of the chemical composition based on given four ratios of oxides. However, the spatial position of this point is determined not by one, but by two projections onto mutually perpendicular planes, following the method of descriptive geometry. Although the highest achievable simplicity was attained in all other respects, the clarity of the representation still suffered somewhat precisely because of the depiction in two projections. In this article, I aim to systematically present the sequence of all operations necessary for graphical representations so that they become clear even to persons who have no conception of either the tetrahedral scheme or the system of vectorial circles.
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References
- Fortschritte der Mineralogie, Kristallographie und Petrographie, Vol. IV, p. 175.
- Mineralogische und Petrographische Mitteilungen, Vol. 19, p. 351; Vol. 20, p. 399; Vol. 21, p. 365; Vol. 22, p. 322.