View Original Image at Full SizeThe gabbro is composed of unstable minerals (plagioclase, pyroxene, olivine and amphibole) and easily succumbs to granular disintegration. The interlocking texture and more stable mineral assemblage of the hornfels (quartz, K-feldpar, plagioclase, mica, cordierite and andalusite), makes it more resistant than both the plutonic rock that created it and the slate from which it was derived.
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Image by Lindley Hanson
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