Homilite

Homilite is a borosilicate mineral belonging to the gadolinite group of minerals with formula Ca
2(Fe,Mg)B
2Si
2O
10.

It occurs as brown monoclinic crystals (space group P21/a[1]) within feldspar masses in pegmatite and was discovered in 1876 in Stoko island, Langesundfiord, Norway. The name is from the Greek for to occur together, in allusion to its association with meliphanite and allanite.

References
  1. Miyawaki, R.; Nakai, I.; Nagashima, K. (15 January 1985). "Structure of homilite, Ca2.00(Fe0.90Mn0.03)B2.00Si2.00O9.86(OH)0.14". Acta Crystallographica Section C Crystal Structure Communications. 41 (1): 13–15. doi:10.1107/S010827018500261X.


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