ophitic

British  

/ əʊˈfɪtɪk /

adjective

1. (of the texture of rocks such as dolerite) having small elongated unorientated feldspar crystals enclosed within pyroxene grains

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Example Sentences

The commonest type of structure in dolerite is the ophitic, which results from the felspar of the rock having crystallized before the augite; the latter mineral forms shapeless masses in which the idiomorphic felspars lie.

From Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 6 "Dodwell" to "Drama" by Various

Many of them are ophitic, especially those which contain olivine, but others are intersertal, like the intersertal dolerites.

From Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 3 "Destructors" to "Diameter" by Various

In the rocks of this group ophitic structure is typically absent, and the presence of an interstitial finely crystalline or amorphous material gives rise to the structure which is known as “intersertal.”

From Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 6 "Dodwell" to "Drama" by Various

Exceptions to this sequence are unusual; sometimes the first of the felspars have preceded the hornblende or biotite which may envelop them in ophitic manner.

From Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 "Gordon, Lord George" to "Grasses" by Various

Their structure is ophitic in the finer varieties, and to some extent in the coarser kinds as well.

From History and Comprehensive Description of Loudoun County, Virginia by Head, James William