#cryptoperthite

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https://www.britannica.com/science/nepheline-syenite

What is nepheline syenite used for?

Nepheline syenite from Canada is used to replace feldspar in the manufacture of ceramic and glass products. The feldspar in nepheline syenite may be cryptoperthite or, rarely, a mixture of albite and microcline. Nepheline is sometimes wholly or partly replaced by sodalite or cancrinite.

Is nepheline syenite toxic?

Acute Toxicity Values: No acute toxicity data is available for product. No ecotoxicity data is available. This product is not expected to present an environmental hazard. Waste Disposal Method: Nepheline Syenite is not classified as a hazardous waste under US EPA RCRA regulations.

Does nepheline have cleavage?

Resembles feldspars but nepheline is uniaxial, lacks good cleavage and twinning, and has a low birefringence. Nepheline is softer than quartz and differs in optic sign. Nepheline occurs in alkali-rich, silicon poor igneous rocks (nepeline syenite, foidite and phonolite).

Is nepheline a rock or mineral?

feldspathoid mineral

Nepheline is an important feldspathoid mineral. It is white, grey or yellow in colour with a vitreous lustre and a poor cleavage. The name Nepheline comes from the Greek word nephele, which means “cloud,” because it becomes strongly clouded when put in strong acid. Nepheline only forms in silica-poor rocks.

[my-name-is-dahlia]

Vocabulary (pt.dccclxxviii)

Words related to igneous rocks taken from Children’s Encyclopedia of Rocks and Fossils (2019) by Claudia Martin:

dunite (n.) a green to brownish coarse-grained igneous rock consisting largely of olivine.

tuff (n.) rock formed by the consolidation of volcanic ash.

andesite (n.) a fine-grained brown or greyish intermediate volcanic rock.

aphanitic (adj.) of or relating to an igneous rock in which the crystals are so fine that individual minerals cannot be distinguished with the naked eye. [x]

larvikite (n.) an alkali-syenite rock composed chiefly of cryptoperthite or anorthoclase in rhombic crystals and widely used as an ornamental building stone. [x]

pyroclastic (adj.) of or formed from fragments of rock from a volcanic eruption.

porphyritic (adj.) geology. relating to or denoting a rock texture, typically found in volcanic rocks, containing distinct crystals or crystalline particles embedded in a fine-grained groundmass.

phaneritic (adj.) of or relating to an igneous rock in which the crystals are so coarse that individual minerals can be distinguished with the naked eye. Phaneritic rocks are intrusive rocks that cooled slowly enough to allow significant crystal growth.

pegmatitic (adj.) of a texture in which the mineral grains are exceptionally large. The largest ones are, by convention, more than about 3 cm long. This texture is found in intrusive rocks. [x]

glassy (adj.) of a vitreous texture that occurs during some volcanic eruptions when the lava is quenched so rapidly that crystallization cannot occur. The result is a natural amorphous glass with few or no crystals. [x]

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