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Homilite

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About HomiliteHide

Formula:
Ca2(Fe2+,Mg)B2Si2O10
Colour:
Greenish black to brownish black
Lustre:
Vitreous, Resinous
Hardness:
5 - 5½
Specific Gravity:
3.34
Crystal System:
Monoclinic
Name:
Named by Sigurd Reinhold Paijkull (1849-1884) from the Greek ὁμιλέω, "to occur together," in allusion to its association with meliphanite and "erdmannite"
A borosilicate mineral belonging to the datolite subgroup of the gadolinite group of the gadolinite supergroup. Crystals of homilite was first noticed from Stokkøya, Langesundsfjorden, Norway by A. E. Nordenskiöld in 1860, but it was first published and described by S.R.Paijkull (1876). Brøgger (1890) published extensive crystallographic data. The structure was solved by Miyawaki et al. (1985) on the material from type locality.

In the Langesundsfjorden area, Norway it occurs in syenite pegmatites, exclusively within the "meliphanite zone", a zone strecthing across the central parts of the Stokkøya and Arøya Island. Homilite was also discovered in a volcanic ejectum at Tre Croci, Vico volcanic complex, Viterbo Province, Latium, Italy in 2004 (Pierini 2004).


Classification of HomiliteHide

Approved, 'Grandfathered' (first described prior to 1959)
First Published:
1876
9.AJ.20

9 : SILICATES (Germanates)
A : Nesosilicates
J : Nesosilicates with BO3 triangles and/or B[4], Be[4] tetrahedra, cornersharing with SiO4
54.2.1b.5

54 : NESOSILICATES Borosilicates and Some Beryllosilicates
2 : Borosilicates and Some Beryllosilicates with B in [4] coordination
17.5.48

17 : Silicates Containing other Anions
5 : Borosilicates

Physical Properties of HomiliteHide

Vitreous, Resinous
Transparency:
Opaque
Colour:
Greenish black to brownish black
Comment:
Translucent in very thin splinters
Streak:
Grey
Hardness:
5 - 5½ on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Sub-Conchoidal
Density:
3.34 g/cm3 (Measured)    

Optical Data of HomiliteHide

Type:
Biaxial (+)
RI values:
nα = 1.715 nβ = 1.725 nγ = 1.738
2V:
Measured: 80° , Calculated: 84°
Max Birefringence:
δ = 0.023
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
none

Chemical Properties of HomiliteHide

Formula:
Ca2(Fe2+,Mg)B2Si2O10
IMA Formula:
Ca2Fe2+B2Si2O10
Common Impurities:
Al,Mn,Na

Chemical AnalysisHide

Oxide wt%:
 12
SiO231.87 %31.58 %
B2O3 by difference18.08 %21.46 %
FeO16.25 %17.03 %
Fe2O32.15 % %
Al2O31.50 % %
CaO27.28 %29.43 %
MgO0.52 % %
Na2O1.50 % %
K2O0.41 % %
LOI0.85 % %
MnO %0.50 %
Total:100.41 %100 %
Sample references:
IDTypeLocalityReference
1Type SpecimenStokkøya, Langesundsfjorden, Larvik, Vestfold, NorwayPaijkull, S. R (1876): Homilit, ett mineral från Brevig i Norge, Geologiska Föreningens i Stockholm Förhandlingar 3, 229-232
2  "  "Miyawaki R, Makai I, Nagashima K (1985) Structure of homilite, Ca2.00(Fe0.90Mn0.03)B2.00Si2.00O9.86(OH)0.14. Acta Crystallographica C41: 13-15

Crystallography of HomiliteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/a
Cell Parameters:
a = 9.78 Å, b = 7.61 Å, c = 4.78 Å
β = 90.56°
Ratio:
a:b:c = 1.285 : 1 : 0.628
Unit Cell V:
355.74 ų (Calculated from Unit Cell)
Morphology:
Observed forms (after Brögger 1890): {001},{011},{021},{010},{100},{720},{310},{210},{110},{890},{120},{201},{11-1},{211},{111},{421},{221},{10.5.2}
Twinning:
Frequently occurs as twins: with [100) as the twin plane, with (001) as the twin plane, with (430) as the twin pane or with (120) as the twin plane.

Occurrences of HomiliteHide

Paragenetic Mode(s):
•  Syenite

Type Occurrence of HomiliteHide

General Appearance of Type Material:
Black to black-brownish crystal
Place of Conservation of Type Material:
Muséum National d’Histoire Naturelle, Galerie Nationale de Minéralogie et de Géologie, Paris, France (catalogue #78142), Naturhistoriske Riksmuseet, Sektionen för Mineralogi, Stockholm, Sweden (catalogue # 531010)
Geological Setting of Type Material:
Nepheline syenite pegmatite
Associated Minerals at Type Locality:
Reference:
Paijkull, S. R. (1876): Homilit, ett mineral från Brevig i Norge. Geologiska Föreningens i Stockholm Förhandlingar, 3: 229-232

Other Language Names for HomiliteHide

German:Homilit
Spanish:Homilita

Relationship of Homilite to other SpeciesHide

Other Members of this group:
DatoliteCaB(SiO4)(OH)Mon. 2/m : P21/b

Common AssociatesHide

AegirineNaFe3+Si2O6
AnalcimeNa(AlSi2O6) · H2O
Apatite"Apatite" is a field term for unidentified calcium phosphate members of the apatite group.
AstrophylliteK2NaFe2+7Ti2Si8O28(OH)4F
BiotiteA series or subgroup of the Mica Group.
LöllingiteFeAs2
Meliphanite(Ca,Na)2(Be,Al)[Si2O6(OH,F)]
MicroclineK(AlSi3O8)
NephelineNa3K(Al4Si4O16)
TitaniteCaTi(SiO4)O
ZirconZr(SiO4)
Associated Minerals Based on Photo Data:
Meliphanite1 photo of Homilite associated with Meliphanite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.AJ.Hingganite-(Nd)(Nd,Y,Ce,Sm)2(◻,Fe2+)Be2[SiO4]2(OH)2Mon. 2/m : P21/b
9.AJ.05Grandidierite(Mg,Fe2+)(Al,Fe3+)3(SiO4)(BO3)O2Orth. mmm (2/m 2/m 2/m)
9.AJ.05Ominelite(Fe2+,Mg)(Al,Fe3+)3(SiO4)(BO3)O2Orth. mmm (2/m 2/m 2/m)
9.AJ.10Dumortierite(Al,Fe3+)7(SiO4)3(BO3)O3Orth. mmm (2/m 2/m 2/m)
9.AJ.10Holtite(Ta0.60.4)Al6BSi3O18(O,OH)2.25Orth. mmm (2/m 2/m 2/m) : Pnma
9.AJ.10Magnesiodumortierite(Mg,Ti,◻(Al,Mg)2Al4Si3O18-y(OH)yB y = 2-3Orth.
9.AJ.15GarrelsiteBa3NaSi2B7O16(OH)4Mon.
9.AJ.20BakeriteCa4(H5B5Si3O20)Mon. 2/m : P21/b
9.AJ.20DatoliteCaB(SiO4)(OH)Mon. 2/m : P21/b
9.AJ.20Gadolinite-(Ce)(Ce,La,Nd,Y)2Fe2+Be2Si2O10Mon. 2/m
9.AJ.20Gadolinite-(Y)Y2Fe2+Be2Si2O10Mon. 2/m : P21/b
9.AJ.20Hingganite-(Ce)(Ce,REE)2(□,Fe2+)Be2[SiO4]2(OH)2Mon. 2/m : P21/b
9.AJ.20Hingganite-(Y)(Y,REE,Ca)2(□,Fe2+)Be2[SiO4]2(OH)2Mon. 2/m : P21/b
9.AJ.20Hingganite-(Yb)(Yb,Y,REE)2□Be2[SiO4]2(OH)2
9.AJ.20Melanocerite-(Ce)(Ce,Ca)5(SiO4,BO4)3(OH,0)Hex.
9.AJ.20Minasgeraisite-(Y)BiCa(Y,Ln)2(□,Mn)2(Be,B,Si)4Si4O16 [(OH),O]4Tric. 1 : P1
9.AJ.20Calcybeborosilite-(Y)(Y,Ca)2(□,Fe2+)(B,Be)2[SiO4]2(OH,O)2Mon.
9.AJ.25Stillwellite-(Ce)(Ce,La,Ca)BSiO5
9.AJ.30Cappelenite-(Y)Ba(Y,Ce)6Si3B6O24F2Trig. 3 : P3
9.AJ.35Okanoganite-(Y)(Na,Ca)3(Y,Ce)12Si6B2O27F14
9.AJ.35Vicanite-(Ce)(Ca,Ce,La,Th)15As5+(As3+0.5,Na0.5)Fe3+Si6B4O40F7Trig.
9.AJ.35Hundholmenite-(Y)(Y,REE,Ca,Na)15(Al,Fe3+)(CaxAs3+1-x)(Si,As5+)Si6B3(O,F)48Trig. 3m : R3m
9.AJ.35Proshchenkoite-(Y)Ca(Y,REE,Ca,Na,Mn)15Fe2+(P,Si)Si6B3O34F14Trig. 3m : R3m
9.AJ.40JadariteLiNaSiB3O7(OH)Mon. 2/m

Related Minerals - Dana Grouping (8th Ed.)Hide

54.2.1b.1BakeriteCa4(H5B5Si3O20)Mon. 2/m : P21/b
54.2.1b.2Gadolinite-(Ce)(Ce,La,Nd,Y)2Fe2+Be2Si2O10Mon. 2/m
54.2.1b.3Gadolinite-(Y)Y2Fe2+Be2Si2O10Mon. 2/m : P21/b
54.2.1b.4Calciogadolinite-(Y)(YCa)2Fe3+Be2[SiO4]2O2
54.2.1b.6Minasgeraisite-(Y)BiCa(Y,Ln)2(□,Mn)2(Be,B,Si)4Si4O16 [(OH),O]4Tric. 1 : P1

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

17.5.1ManandoniteLi2Al4(Si2AlB)O10(OH)8Orth.
17.5.2ReedmergneriteNaBSi3O8Tric.
17.5.3SearlesiteNa(H2BSi2O7)Mon. 2 : P21
17.5.4OleniteNa(Al3)Al6(Si6O18)(BO3)3O3(OH)Trig.
17.5.5ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
17.5.6KalborsiteK6Al4BSi6O20(OH)4ClTet.
17.5.7BoromuscoviteKAl2(BSi3O10)(OH)2Mon.
17.5.8PoudretteiteKNa2B3Si12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
17.5.9LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
17.5.10DatoliteCaB(SiO4)(OH)Mon. 2/m : P21/b
17.5.11DanburiteCaB2Si2O8Orth. mmm (2/m 2/m 2/m)
17.5.12HowliteCa2B5SiO9(OH)5Mon. 2/m : P21/b
17.5.13BakeriteCa4(H5B5Si3O20)Mon. 2/m : P21/b
17.5.14OyeliteCa10Si8B2O29 · 12.5H2OOrth.
17.5.15KornerupineMg3Al6(Si,Al,B)5O21(OH)Orth. mmm (2/m 2/m 2/m)
17.5.16HarkeriteCa12Mg4Al(BO3)3(SiO4)4(CO3)5 · H2OTrig. 3m (3 2/m) : R3m
17.5.17SerendibiteCa4[Mg6Al6]O4[Si6B3Al3O36]Tric. 1 : P1
17.5.18Stillwellite-(Ce)(Ce,La,Ca)BSiO5
17.5.19Tadzhikite-(Ce)Ca4Ce3+2Ti◻(B4Si4O22)(OH)2Mon.
17.5.20Melanocerite-(Ce)(Ce,Ca)5(SiO4,BO4)3(OH,0)Hex.
17.5.21Okanoganite-(Y)(Na,Ca)3(Y,Ce)12Si6B2O27F14
17.5.22Tritomite-(Ce)Ce5(SiO4,BO4)3(OH,O)
17.5.23Tritomite-(Y)Y5(SiO4,BO4)3(O,OH,F)
17.5.24Cappelenite-(Y)Ba(Y,Ce)6Si3B6O24F2Trig. 3 : P3
17.5.25Dumortierite(Al,Fe3+)7(SiO4)3(BO3)O3Orth. mmm (2/m 2/m 2/m)
17.5.26Holtite(Ta0.60.4)Al6BSi3O18(O,OH)2.25Orth. mmm (2/m 2/m 2/m) : Pnma
17.5.27DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
17.5.28 FerridraviteNaFe3+3(Mg2Fe3+4)(Si6O18)(BO3)3(OH)3O
17.5.29Axinite-(Mg)Ca2MgAl2BSi4O15OHTric.
17.5.30Uvite SeriesCa(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(F/OH)Trig. 3m : R3m
17.5.31GarrelsiteBa3NaSi2B7O16(OH)4Mon.
17.5.32TienshaniteKNa3Na6Ca2Ba6Mn6(Ti4+,Nb)6B12Si36O114(O,OH,F)11Hex. 6/m : P6/m
17.5.33LeucospheniteBaNa4Ti2B2Si10O30Mon.
17.5.34TaramelliteBa4(Fe3+,Ti,Fe2+,Mg)4(B2Si8O27)O2ClxOrth. mmm (2/m 2/m 2/m) : Pmmn
17.5.35TitantaramelliteBa4(Ti,Fe3+,Fe2+,Mg)4(B2Si8O27)O2ClxOrth.
17.5.36NagashimaliteBa4(V,Ti)4B2Si8O27(O,OH)2ClOrth. mmm (2/m 2/m 2/m) : Pmmn
17.5.37Chromium-draviteNa(Mg3)Cr3+6(Si6O18)(BO3)3(OH)3(OH)Trig.
17.5.38WawayandaiteCa6Mn2BBe9Si6O23(OH,Cl)15Mon.
17.5.39Werdingite(Mg,Fe)2Al14Si4B4O37Tric.
17.5.40Axinite-(Mn)Ca2Mn2+Al2BSi4O15(OH)Tric. 1 : P1
17.5.41AxiniteTric.
17.5.42TinzeniteCa2Mn2+4Al4[B2Si8O30](OH)2Tric.
17.5.44SchorlNa(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
17.5.45Fluor-buergeriteNa(Fe3+3)Al6(Si6O18)(BO3)3O3FTrig. 3m : R3m
17.5.46FeruviteCa(Fe2+)3MgAl5(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
17.5.47Axinite-(Fe)Ca2Fe2+Al2BSi4O15OHTric. 1 : P1
17.5.49Grandidierite(Mg,Fe2+)(Al,Fe3+)3(SiO4)(BO3)O2Orth. mmm (2/m 2/m 2/m)
17.5.50Hyalotekite(Pb,Ba,K)4(Ca,Y)2(B,Be)2(Si,B)2Si8O28(F,Cl)Tric. 1 : P1
17.5.51Hellandite-(Y)(Ca,REE)4Y2Al◻2(B4Si4O22) (OH)2Mon.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for HomiliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Paijkull, S. R. (1876): Homilit, ett mineral från Brevig i Norge, Geologiska Föreningens i Stockholm Förhandlingar, 3, 229-232
Des Cloizeaux, A. & Damour, A. (1877): Note sur la forme cristalline, les propriétes optiques et la composition chimique de la homilite. Annales de Chimie et de Physique. 12 : 405-412
Brögger, W.C. (1890): Die Mineralien der Syenitpegmatitgänge der südnorwegischen Augit- und Nephelinsyenite. Zeitschrift für Kristallographi und Mineralogie, B. 16, Leipzig 1890.
Miyawaki R, Makai I, Nagashima K (1985) Structure of homilite, Ca2.00(Fe0.90Mn0.03)B2.00Si2.00O9.86(OH)0.14. Acta Crystallographica C41: 13-15
Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).
Pierini, G. (2004): Homilite in un proietto vulcanico a Tre Croci di Vetralla (VT). Micro (notizie mineralogiche), 2004: 5-12.

Internet Links for HomiliteHide

Localities for HomiliteHide

ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Italy
 
  • Latium
    • Viterbo Province
      • Vico volcanic complex (Vico Lake)
        • Vetralla
Pierini, G. (2004): Homilite in un proietto vulcanico a Tre Croci di Vetralla (VT). Micro (notizie mineralogiche), 2004, 5-12; American Mineralogist, Volume 91, pages 1170–-1177, 2006
Norway
 
  • Vestfold
    • Larvik
      • Langesundsfjorden
        • Arøya (Arö)
Brøgger, W.C. (1890): Die Mineralien der Syenitpegmatitgänge der südnorwegischen Augit-und Nephelinsyenite. Zeitschrift für Kristallographie und Mineralogie 16. p. 61-64
Åsheim, A., Aadahl, H. Chr. & Larsen, A. O.(1980): Nytt funn av Nordenskiöldin. NAGS-nytt 7 (3), 10 (in norwegian)
Larsen, A. O. (ed.) (2010): The Langesundsfjord. History, geology, pegmatites, minerals. Bode Verlag Gmbh, Salzhemmendorf, Germany, 240 p
Brøgger, W.C. (1890): Die Mineralien der Syenitpegmatitgänge der südnorwegischen Augit-und Nephelinsyenite. Zeitschrift für Kristallographie und Mineral. 16. 663 pp (p 367-377)
Paijkull, S. R (1876): Homilit, ett mineral från Brevig i Norge, Geologiska Föreningens i Stockholm Förhandlingar 3, 229-232; Larsen, A. O. (ed.) (2010): The Langesundsfjord. History, geology, pegmatites, minerals. Bode Verlag Gmbh, Salzhemmendorf, Germany, 240 p
        • Stokksund (Stoksund)
Naturhistorska Riskmuseets Stockholm collection # g17709,g17701 ; Knut Eldjarn collection
      • Tvedalen
Nordrum, F.S. (2001): Noen funn av mineraler i Norge 2000-2001. STEIN 28 (2): 13- 19
    • Sandefjord
      • Vesterøya
Hansen, R.(1981): Mineralnotater. NAGS-nytt 8 (4),18
Romania
 
  • Suceava Co.
    • Suceava district
      • Iacobeni (Jakobeny; Jacobeny; Jakabfalva)
http://minerals-of-the-carpathians.eu
Sweden
 
  • Värmland
    • Filipstad
      • Nordmark Odal Field (Nordmarksberg)
Probed 2004 - M.E. Ciriotti
Mineral and/or Locality  
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