#mineralmonday collection of travertine-limestone from 1910, Karlsbad, Germany http://pic.twitter.com/ci9La06aRy
— David Bressan (@David_Bressan) December 14, 2015
via Twitter https://twitter.com/David_Bressan
December 14, 2015 at 07:00PM
#mineralmonday collection of travertine-limestone from 1910, Karlsbad, Germany http://pic.twitter.com/ci9La06aRy
— David Bressan (@David_Bressan) December 14, 2015
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