A network of intruded mineral vein in a coherent facies of ryolite lava.  This picture ca. 40 c

A network of intruded mineral vein in a coherent facies of ryolite lava.  This picture ca. 40 c

A network of intruded mineral vein in a coherent facies of ryolite lava.  This picture ca. 40 cm wide.   鉱物脈  

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Fri, 18 Feb 2022 18:52:14