Quartz with Rutile needle crystals as inclusion, forming so called Rutile-Grid inside, Canton of Ticino, Swiss http://pic.twitter.com/mggzxEXMTN
— David Bressan (@David_Bressan) October 29, 2016
via Twitter https://twitter.com/David_Bressan
October 30, 2016 at 12:46AM
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