I may not have been clear about what I was looking for. I had two
(1) scientific validity of two components that if they are individually
scientifically viable, can they be divided one by the other and then this
figure plotted against a third component, z (which is actually 1D space, ie.
z = location of x/y along the mineral grain).
I know about spurious correlation from Rollinson, but I had in mind an
isochron plot for (ii) – (x = f/g -v- y = h/g), which I understand holds
unlike oxide plots. If this is now considered not to be the case, please
advise. Specifically, can (1) above hold scientifically?
(2) Plot 2D in Excel – again I was thinking along the lines of (1) above but
for 2D = crystal face. Thank you for suggestions of alternative programmes
to do this.
I thank all for suggestions of tetrahedra plots – they were not what I was
looking for today (my fault, apologies), but I know I will in the future – I
have kept the details.
Frank Spear and Paul Jackson: I will write to you separately.
Thank you all for your responses.
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