14 September 2010


Delicate crystals of Hematite, Fe2O3, and Cristobalite, SiO2.  I had to look up the latter: "cristobalite is a high-temperature polymorph of quartz, meaning that it is composed of the same chemistry, SiO2, but has a different structure..."  Much more at the link, where it gets way more complicated than I care to blog.

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