Afghanite

Химия

IMA chemistry:: (Na,K)22Ca10(Si24Al24)O96(SO4)6Cl6
Valence chemistry:: (Na,K)22Ca10(Si24Al24)O96(S6+O4)6Cl6

Классификация

Crystal systems:: hexagonal
Space groups:: P31c
Structural group:: Cancrinite-sodalite
IMA status:: Approved

Происхождение

Country:: Afghanistan
Published:: 1967
Oldest age Ma:: 1600
Paragenetic modes:: Abiotic, Primary, Secondary, Stage 4a: Earth's earliest continental crust, PM31 - Contact metamorphism, Stage 4b: Highly evolved igneous rocks, PM35 - Ultra-alkali and agpaitic igneous rocks

Примечания

Bariand P, Cesbron F, Giraud R (1968) Une nonvelle espece minerale: L’afghanite de Sar–e–Sang, Badakhshan, Afghanistan–Comparaison avec les mineraux du groupe de la cancrinite, Bulletin de la Société Française de Minéralogie et de Cristallographie 91, 34-42 Chemical formula revised: Ballirano P, Bonaccorsi E, Maras A, Merlino S (1997) Crystal structure of afghanite, the eight-layer member of the cancrinite-group: evidence for long-range Si,Al ordering. European Journal of Mineralogy 9, 21-30