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kareinaThe sample I was describing yesterday is one with a large (1.8 cm) garnet with a screamingly obvious visual difference between the core and the rim.
Comparing the photo with the graph showing the changes in composition shows that not only is there a visual difference between the core and the rim, but there is a very abrupt change in the composition as well (the four lines relate to the four "end members" which combine to make up garnet--adding up the values for those four at any given point will equal 1). Last night, when describing this garnet, I was ok with the change of composition between the core and the rim, but was at a loss at how to describe the second change which takes place in the middle of the rim, and was reduced to clunky sentences that said things like "at the same point in which almandine starts to decrease again". This morning I woke up with this photo & graph hovering in my dream eyes, and realized that "duh", I could refer to that point as a "transition point", and suddenly the sentences are ever so much easier to construct, and, more importantly, easier to understand when reading them again. I love sleep, it is so good for one's ability to think!
Comparing the photo with the graph showing the changes in composition shows that not only is there a visual difference between the core and the rim, but there is a very abrupt change in the composition as well (the four lines relate to the four "end members" which combine to make up garnet--adding up the values for those four at any given point will equal 1). Last night, when describing this garnet, I was ok with the change of composition between the core and the rim, but was at a loss at how to describe the second change which takes place in the middle of the rim, and was reduced to clunky sentences that said things like "at the same point in which almandine starts to decrease again". This morning I woke up with this photo & graph hovering in my dream eyes, and realized that "duh", I could refer to that point as a "transition point", and suddenly the sentences are ever so much easier to construct, and, more importantly, easier to understand when reading them again. I love sleep, it is so good for one's ability to think!
