<i>Michelinia</i> sp., Tournaisian (Lower Carboniferous). "Belgian Blue Stone". Polished section in a block used as construction element. Private residence in Belgium. They often come from quarries in Ecaussines (Soignies) or around Tournai. <small>(Coin scale: 1 EUR, Ø 23.25 mm)</small>
<a href="//commons.wikimedia.org/wiki/User:PePeEfe" title="User:PePeEfe">PePeEfe</a>
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<span class="int-own-work" lang="en">Own work</span>