lamprophyre

American  

[lam-pruh-fahy^uhr] / ˈlæm prəˌfaɪər /

noun

Petrology.

1. any dark intrusive rock in which dark minerals occur both as phenocrysts and as groundmass.

---

lamprophyre British  

/ ˈlæmprəˌfaɪə /

noun

1. any of a group of basic igneous rocks consisting of feldspathoids and ferromagnesian minerals, esp biotite: occurring as dykes and minor intrusions

---

lamprophyre Scientific  

/ lăm′prə-fīr′ /

1. A dark igneous rock, having a porphyritic texture in which both the phenocrysts (larger crystals) and the matrix consist primarily of pyroxene, hornblende, and biotite.

---

Other Word Forms

• lamprophyric adjective

Etymology

Origin of lamprophyre

1885–90; lampro- (< Greek lamprós clear) + -phyre

Example Sentences

There are only three types of magma on the planet that can manage it, at least that we’ve identified so far: kimberlite, lamproite, and lamprophyre.

From Scientific American • May 4, 2019

They are found mostly as loose crystals in gravel, but are known also in igenous rocks like andesite and lamprophyre.

From Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 4 "Coquelin" to "Costume" by Various

Sheets of quartz-porphyry, lamprophyre and diorite are also represented, the first of these types being quarried at Crarae on the north shore of Loch Fyne.

From Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 5 "Arculf" to "Armour, Philip" by Various

Typically they occur as dikes or as thin sills, often in association with nepheline-syenite; and they seem to bear a complementary relationship to certain types of lamprophyre, such as camptonite and monchiquite.

From Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 3 "Borgia, Lucrezia" to "Bradford, John" by Various