افغانیت
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Afghanite, (Na,K)22Ca10[Si24Al24O96](SO4)6Cl6, is a hydrous sodium, calcium, potassium, sulfate, chloride, carbonate alumino-silicate mineral. Afghanite is a feldspathoid of the cancrinite group and typically occurs with sodalite group minerals. It forms blue to colorless, typically massive crystals in the trigonal crystal system. The lowering of the symmetry from typical (for cancrinite group) hexagonal one is due to ordering of Si and Al. It has a Mohs hardness of 5.5 to 6 and a specific gravity of 2.55 to 2.65. It has refractive index values of nω = 1.523 and nε = 1.529. It has one directio
Key facts
- Mineral.name
- Afghanite
- Mineral.image
- Afghanite (Afghanistan) 1.jpg
- Mineral.imagesize
- 260
- Mineral.caption
- Afghanite (light blue) with sodalite/lazurite (blue) coating
- Mineral.category
- Tectosilicate minerals
- Mineral.group
- Feldspathoid group, cancrinite group
- Mineral.formula
- (Na,K)22Ca10[Si24Al24O96](SO4)6Cl6
- Mineral.IMAsymbol
- Afg
- Mineral.strunz
- 9.FB.05
- Mineral.system
- Trigonal
- Mineral.class
- Ditrigonal pyramidal H-M symbol: (3m)
- Mineral.symmetry
- P3c1
- Mineral.unit cell
- a = 12.796, c = 21.409 [Å]; Z = 1
- Mineral.color
- light blue, dark blue
- Mineral.habit
- elongated, bullet-like crystals with pointed ends
- Mineral.cleavage
- Perfect {100}
- Mineral.fracture
- Conchoidal
- Mineral.mohs
- 5.5–6
via Wikipedia infobox
Wikidata facts
- Subclass of
- gemstone
- Named after
- Afghanistan
- Image
- Afghanite (Afghanistan) 1.jpg
Show 8 more facts
- IMA Mineral Symbol
- Afg
- Commons category
- Afghanite
- Nickel-Strunz 9th edition (updated 2009)
- 9.FB.05
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 9.FB.05
- crystal system
- trigonal crystal system
- streak color
- white
- chemical formula
- (Na,K)₂₂Ca₁₀(Si₂₄Al₂₄)O₉₆(SO₄)₆Cl₆
- Strunz 8th edition (series ID, updated)
- VIII/F.05
Sources (2)
via Wikidata · CC0