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Formula: Ca2Fe2+B2Si2O10
Nesosilicate (insular SiO4 groups),
datolite-gadolinite group
Crystal System: Monoclinic
Specific gravity: 3.34 measured
Hardness: 5 to 5½
Streak: Grey
Colour: Greenish black to brownish black
Solubility: Readily soluble in common acids
Common impurities: Al,Mn,Na
Environments
Volcanic igneous environments
Pegmatites
Homilite occurs in veins in augite
nepheline syenite associated with
allanite, meliphanite,
titanite, zircon,
aegirine, löllingite,
astrophyllite, melanocerite,
nordenskiöldine, wöhlerite,
hiortdahlite and molybdenite
(HOM, Dana).
Localities
At Tre Croci, Vetralla, Viterbo Province, Lazio, Italy, homilite was discovered in a volcanic ejectum
(Mindat).
At the type locality, Stokkøya, Langesundsfjorden, Larvik, Vestfold og Telemark, Norway, homilite was found in
nepheline syenite
pegmatites associated with
meliphanite
(Mindat).
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