staurolite

American  

[stawr-uh-lahyt] / ˈstɔr əˌlaɪt /

noun

1. a mineral, basic iron aluminum silicate, Fe 2 Al 2 O 7 (SiO4 ) 4 (OH), occurring in brown to black prismatic crystals, which are often twinned in the form of a cross.

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staurolite British  

/ ˈstɔːrəˌlaɪt, ˌstɔːrəˈlɪtɪk /

noun

1. a brown glassy mineral consisting of iron aluminium silicate in the form of prismatic crystals: used as a gemstone. Formula: Fe 2 Al 9 Si 4 O 11 (OH) 2

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staurolite Scientific  

/ stou′rə-līt′ /

1. A brownish to black orthorhombic mineral, often having crossed intergrown crystals and found in mica schists and gneisses. Chemical formula: (FeMg) ₂ Al ₉ Si ₄ O ₂₃ (OH).

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Other Word Forms

• staurolitic adjective

Etymology

Origin of staurolite

1790–1800; < Greek stauró ( s ) a cross + -lite

Example Sentences

Chlorite, muscovite, biotite, garnet, and staurolite are index minerals representing a respective sequence of low-to-high grade rock.

From Textbooks • Jan. 1, 2017

Regular intergrowths of crystals of totally different substances such as staurolite with cyanite, rutile with haematite, blende with chalcopyrite, calcite with sodium nitrate, are not uncommon.

From Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" by Various

Cyanite is a characteristic mineral of the metamorphic crystalline rocks—gneiss, schist, granulite and eclogite—and is often associated with garnet and staurolite.

From Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 "Cube" to "Daguerre, Louis" by Various

Kyanite and staurolite may also be mentioned as occasionally occurring.

From Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 2 "Gloss" to "Gordon, Charles George" by Various