Massive ruby (a variety of corundum) in a matrix of zoisite and tschermakite. Sample collected from Mt Kilimanjaro and housed at Caltech. Although not every department may not NEED a library, every department needs a mineral collection! https://t.co/OCcRNbH5Kw pic.twitter.com/zEfocRVZsV
— Traveling Geologist (@travelinggeolog) February 22, 2019
via Twitter https://twitter.com/travelinggeolog
February 22, 2019 at 12:02PM
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