Melaphyre

Definitions

  • Webster's Revised Unabridged Dictionary
    • n Melaphyre (Min) Any one of several dark-colored augitic, eruptive rocks allied to basalt.
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Century Dictionary and Cyclopedia
    • n melaphyre A fine-grained greenish- or brownish-black aggregate of plagioclase, augite, olivin, magnetite, or titaniferous iron and some chloritic mineral, usually delessite. The term melaphyre, as it has been formerly used by lithologists, includes a considerable variety of rocks; but, as now generally restricted, it is properly applied to such basalts as have undergone considerable alteration. Hence the melaphyres are, in point of fact, mostly of Paleozoic age, although some are Mesozoic, because the older a rock is, other things being equal, the more likely it is to have undergone chemical change.
    • n melaphyre It is proposed, in the field classification accompanying the quantitative system of classification of igneous rocks (see rock), to restore the term melaphyre to its early significance and apply it to all dark-colored porphyries, of any composition.
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Chambers's Twentieth Century Dictionary
    • ns Melaphyre a pre-Tertiary basalt, usually altered
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Etymology

Webster's Revised Unabridged Dictionary
F., fr. Gr. me`las me`lanos, black + porphyre, porphyry

Usage

In literature:

The rocks consist chiefly of basalt, dolerite, melaphyre and felstone.
"Volcanoes: Past and Present" by Edward Hull
In China, at the close of the period, there were enormous eruptions of melaphyre, porphyrite and quartz-porphyry.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 3" by Various
The upper part of the Maluti range consists of flows of melaphyres and diabases belonging to the volcanic beds.
"Encyclopaedia Britannica, 11th Edition, Volume 3, Slice 4" by Various
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