phacoidaladj.

Brit.

/faˈkɔɪdl/, U.S.

/fæˈkɔɪd(ə)l/

Origin: A borrowing from Latin, combined with an English element. Etymons: Latin phacoides , -al suffix¹.

Etymology: < post-classical Latin phacoides (see phacoid adj. and n.) + -al suffix¹. Compare earlier phacoid adj. and slightly later phacoid n.

Geology.

Lens-shaped, lenticular; spec. designating lenticular inclusions of feldspar, quartz, etc., in rock (cf. augen n.). Also: characterized by the presence of such inclusions.

ΘΚΠ

the world > the earth > minerals > mineral structure or appearance > [adjective] > phacoidal

phacoidal1901

the world > the earth > structure of the earth > constituent materials > rock > texture or colour > [adjective] > texture > round inclusions

orbicular1824

chondritic1866

phacoidal1901

oncolitic1933

1901 Rep. Brit. Assoc. Advancem. Sci. 617 The basic dykes..appear frequently as phacoidal masses amid the reconstructed gneiss.

1920 A. Holmes Nomencl. Petrol. 39 Augen-gneiss, a general term for gneissose rocks, independently of their origin, containing ‘eyes’, i.e. phacoidal or lenticular crystals, or aggregates, which simulate the porphyritic crystals of igneous rocks.

1956 E. W. Heinrich Microsc. Petrogr. vii. 185 In phacoidal rocks the characteristic textural feature consists of ellipsoidal or lensoid units in a finer-grained matrix that is brecciated and sheared.

1979 Nature 1 Nov. 58/2 A zone of chaotic sediments with phacoidal inclusions of pillow lavas, greywackes and quartzites.

2002 Jrnl. Asian Earth Sci. 20 315/2 Numerous asymmetrical phacoidal pods indicate a top-to-the-SW sense of shear.

This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022).

单词	phacoidal
释义	phacoidaladj. Brit. /faˈkɔɪdl/, U.S. /fæˈkɔɪd(ə)l/ Origin: A borrowing from Latin, combined with an English element. Etymons: Latin phacoides , -al suffix¹. Etymology: < post-classical Latin phacoides (see phacoid adj. and n.) + -al suffix¹. Compare earlier phacoid adj. and slightly later phacoid n. Geology. Lens-shaped, lenticular; spec. designating lenticular inclusions of feldspar, quartz, etc., in rock (cf. augen n.). Also: characterized by the presence of such inclusions. ΘΚΠ the world > the earth > minerals > mineral structure or appearance > [adjective] > phacoidal phacoidal1901 the world > the earth > structure of the earth > constituent materials > rock > texture or colour > [adjective] > texture > round inclusions orbicular1824 chondritic1866 phacoidal1901 oncolitic1933 1901 Rep. Brit. Assoc. Advancem. Sci. 617 The basic dykes..appear frequently as phacoidal masses amid the reconstructed gneiss. 1920 A. Holmes Nomencl. Petrol. 39 Augen-gneiss, a general term for gneissose rocks, independently of their origin, containing ‘eyes’, i.e. phacoidal or lenticular crystals, or aggregates, which simulate the porphyritic crystals of igneous rocks. 1956 E. W. Heinrich Microsc. Petrogr. vii. 185 In phacoidal rocks the characteristic textural feature consists of ellipsoidal or lensoid units in a finer-grained matrix that is brecciated and sheared. 1979 Nature 1 Nov. 58/2 A zone of chaotic sediments with phacoidal inclusions of pillow lavas, greywackes and quartzites. 2002 Jrnl. Asian Earth Sci. 20 315/2 Numerous asymmetrical phacoidal pods indicate a top-to-the-SW sense of shear. This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022). < adj.1901
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