nepheline
Sign in to saveNepheline (), also called nephelite, is a rock-forming mineral in the feldspathoid groupa silica-undersaturated aluminosilicate (Na3KAl4Si4O16) that occurs in intrusive and volcanic rocks with low silica, and in their associated pegmatites. It is used in glass and ceramic manufacturing and other industries, and has been investigated as an ore of aluminium.
Key facts
- Mineral.name
- Nepheline
- Mineral.category
- Tectosilicate minerals
- Mineral.group
- Feldspathoid group
- Mineral.image
- Nepheline3.jpg
- Mineral.IMAsymbol
- Nph
- Mineral.molweight
- 146.08 g/mol
- Mineral.strunz
- 9.FA.05
- Mineral.system
- Hexagonal
- Mineral.class
- Pyramidal (6) H–M symbol: (6)
- Mineral.symmetry
- P63
- Mineral.color
- White, gray, brown, brownish gray, or reddish white
- Mineral.habit
- Massive granular to prismatic
- Mineral.twinning
- On [1010], [3365], and [1122]
- Mineral.cleavage
- [1010] Poor
- Mineral.fracture
- Subconchoidal
- Mineral.mohs
- 6
- Mineral.luster
- Vitreous to greasy
- Mineral.refractive
- nω = 1.529–1.546 nε = 1.526–1.542
via Wikipedia infobox
Article
6 sectionsContents
- Description and properties
- Structure and composition
- Occurrence
- Uses
- References
- External links
Nepheline (), also called nephelite, is a rock-forming mineral in the feldspathoid groupa silica-undersaturated aluminosilicate (Na3KAl4Si4O16) that occurs in intrusive and volcanic rocks with low silica, and in their associated pegmatites. It is used in glass and ceramic manufacturing and other industries, and has been investigated as an ore of aluminium.
== Description and properties == thumb|left|Grayish-white nepheline crystals with dark schorlomite from Bou-Agrao Mount, Tamazeght complex, High Atlas Mountains, Morocco. Size: |204x204px