CIBJO releases Gemmological Special Report: considers process of separating measurable facts from opinion; See Gemological Articles below.
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 Post subject: Ternary plots: Explained with downloads
PostPosted: Thu Oct 24, 2013 2:17 pm 
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Will Vaughan wrote:

and, furthermore:
Dave Mogk of Montana State Univ. wrote:
I've compiled a number of geochemical plotting programs on a website called Geochemical Plotting Programs, and these include a number of Ternary Plotting programs.
These are posted on the Teaching Petrology site:
http://serc.carleton.edu/NAGTWorkshops/ ... grams.html


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 Post subject: Re: Ternary plots: Explained with downloads
PostPosted: Thu Oct 24, 2013 8:34 pm 
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For the record, with pyroxenes you don't technically use the full triangle--it's actually cut off at the middle where Fe/Mg=Ca, forming a trapezoid. The mineral stops being a pyroxene when the Ca exceeds Fe/Mg and starts being a pyroxenoid with a rather different crystal structure (wollastonite). A different example might be the three feldspar end-members, though only a sliver of the triangle is actually occupied since K generally refuses to substitute for Ca.

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 Post subject: Re: Ternary plots: Explained with downloads
PostPosted: Thu Oct 24, 2013 8:47 pm 
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I was thinking the same thing.
For us, the feldspar group, or the garnet group would have been a better example.....but now, if we ever need a ternary plot, we know where to find it. :D


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 Post subject: Re: Ternary plots: Explained with downloads
PostPosted: Thu Oct 24, 2013 11:08 pm 
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The garnet group would be pretty exciting, though you'd probably need one heck of a polygon to represent it.

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 Post subject: Re: Ternary plots: Explained with downloads
PostPosted: Fri Oct 25, 2013 10:29 am 
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:lol: :lol:


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 Post subject: Re: Ternary plots: Explained with downloads
PostPosted: Fri Oct 25, 2013 2:15 pm 
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Quote:
The garnet group would be pretty exciting, though you'd probably need one heck of a polygon to represent it.

If I remember correctly, Dr. Hanneman's Naming Garnets book has a nice cardboard cut-out that does just this, forming into a tetrahedron to display the different chemistries between pyrope, spessartine, almandine, etc. garnets.

It's an interesting read, though I freely admit that much of it went over my head.

You can purchase it by pinging Dr. Hanneman

-Allan

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