homilite

Homilite is a borosilicate mineral belonging to the gadolinite group of minerals with formula .

Key facts

Mineral.symmetry: P21/b
Mineral.name: Homilite
Mineral.imagesize: 260px
Mineral.category: Nesosilicate
Mineral.formula: Ca2(Fe2+,Mg)B2Si2O10
Mineral.IMAsymbol: Hom
Mineral.strunz: 8/B.29-30
Mineral.system: Monoclinic
Mineral.class: Prismatic (2/m)
Mineral.unit cell: a = 9.78 Å, b = 7.61 Å, c = 4.78 Å; β = 90.56°; Z = ?
Mineral.color: Greenish to brownish black
Mineral.mohs: 5–
Mineral.luster: Vitreous, resinous
Mineral.diaphaneity: Opaque
Mineral.gravity: 3.34
Mineral.opticalprop: Biaxial (+)
Mineral.refractive: nα = 1.715 nβ = 1.725 nγ = 1.738
Mineral.birefringence: δ =

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Nickel-Strunz '10th ed', review of (9th ed/ 2009 update): 9.AJ.20
chemical formula: Ca₂Fe²⁺B₂Si₂O₁₀
Nickel-Strunz 9th edition (updated 2009): 9.AJ.20
IMA Mineral Symbol: Hom
Strunz 8th edition (series ID, updated): VIII/A’.12

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Homilite is a borosilicate mineral belonging to the gadolinite group of minerals with formula .

It occurs as brown monoclinic crystals (space group P21/a) 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.