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finnchaga: Banded Agate from Morocco
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finnchaga: Another pictures of agate from Morocco
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finnchaga: Thinsection of altered Kihniö rock
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finnchaga: Heavily altered pyroxene in Kihniö rock
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finnchaga: Kihniö fragmentoitunut osin muuntunut pyrokseeni
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finnchaga: Drumheller dinosaur thinsection
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finnchaga: More old ragged bone...
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finnchaga: Details from Lappajärvi impactite chalcedony sample
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finnchaga: Vuotso chalcedony sample
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finnchaga: Thinning it down...
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finnchaga: Lapin kalsedoni / Lapland chalcedony 2018
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finnchaga: Lapland chalcedony in cross-polarised reflected light
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finnchaga: "Wearing down and turning grey..."
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finnchaga: Lapland goethite reflected light
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finnchaga: Lapland goethite transmitted XPL
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finnchaga: Taking it too far and hard...
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finnchaga: Compositional Art in Polish Chalcedony
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finnchaga: Chalcedony from Lower Silesia
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finnchaga: Bluish "orthoclase impactite sample" photomicrographs
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finnchaga: Another photomigrograph of "bluish Sääksjärvi impactite"
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finnchaga: Fibrous chalcedony etc in Sääksjärvi Bluish impcatite
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finnchaga: ohuthie läpivalaistu XPL valo 0,2 mm
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finnchaga: Sääksjärvi impaktiitti XPL valo 1,1 mm
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finnchaga: Sääksjärvi impaktiitti pintavalo 1,1 mm