diabasic acid

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Masaya Volcano — View of the crater Elevation 635 m (2,083 ft) … Wikipedia
Variolite — Variolites (Latin varius , speckled, variegated ) are a group of dark green basic igneous rocks that, especially on weathered surfaces, exhibit pale colored spots, or spherules, that give them a pockmarked appearance. In some conditions these… … Wikipedia

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