Some stones have blotches of alternate mineral content, whether the blotches are toxic or not, softer or not, helpful or not they are always showy and unique. Japanese naturals seem to have a wide variety of dual color or contrast stones, how about European stones too?
Below is my Nakayama Karasu from the deeper Aisa tomae layer showing bold black crows against the sky pattern. A dark and similar coloration and karasu type but a suita stone with Namazu from a shallower Tenjyou suita layer. And another suita with Namazu and Renge in red and Arigane small brown spots and Suji non-toxic hairline inclusions from the Tenjyou level.
Below is my Nakayama Karasu from the deeper Aisa tomae layer showing bold black crows against the sky pattern. A dark and similar coloration and karasu type but a suita stone with Namazu from a shallower Tenjyou suita layer. And another suita with Namazu and Renge in red and Arigane small brown spots and Suji non-toxic hairline inclusions from the Tenjyou level.
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