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Di Penates (Roman deities): see Penates. diabase, also called dolerite, fine- to
medium-grained, dark-gray to black intrusive igneous rock. It is extremely hard
and tough and is commonly quarried for crushed stone, under the name of trap.
Dunira, Henry Dundas, Baron: see Melville, Henry Dundas, 1st Viscount. dunite,
light yellowish green, intrusive igneous rock that is composed almost entirely of
olivine. Dunite usually forms sills (tabular bodies intruded between other rocks) ...
There is only the roughest of tendencies for duricrust chemistry to be controlled
by bedrock chemistry, even in similar climates, although nephelinesyenites
characteristically weather into allitic (aluminum- rich) crusts, basic igneous rocks
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