#ThinSectionThursday Allanite with concentric growth zoning in an ultramafic xenolith. Granatifera Tuff, Mercaderes, Colombia.
— micROCKScopica (@micROCKScopica) March 7, 2019
Sample kindly provided by A. RodrÃguez Vargas#colors #patterns #geology #rocks #crystals pic.twitter.com/1W1dr3E1kh
via Twitter https://twitter.com/micROCKScopica
March 07, 2019 at 10:17PM
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