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Nature is fractal so I call them god's miniature paintings. They can depict meadows bounded by forests with blue sky and clouds above, or undersea scenes complete with fish and plants, or a glacier face marching into the sea, or mountains by a stormy sea...

If you visit Etsy.com and search for landscape stones you might find the guy I use for volcanic Indonesian glass. He has many hundreds but one in a hundred are truly amazing. He is or was fairly generous with bonus volcanic glass with orders.