Spilite (from σπιλάς) is a fine-grained igneous rock, resulting particularly from alteration of oceanic basalt. The term was introduced into the geological literature by Alexandre Brongniart in 1827. Spilite is formed when basaltic lava reacts with seawater, or from hydrothermal alteration when seawater circulates through hot volcanic rocks....
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http://en.wikipedia.org/wiki/Spilite
fine-grained or dense, extrusive igneous (volcanic) rock that is usually free of visible crystals and is commonly greenish or grayish green in ...
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http://www.britannica.com/eb/a-z/s/140
Fine grained, basic igneous rocks richer in sodium and water than basalt and containing albite rather than plagioclase
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https://www.encyclo.co.uk/local/20501
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