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Melanocerite-(Ce)

A valid IMA mineral species - grandfathered
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Probably a Ca-REE borosilicate within theapatite supergroup.
"To be potentially discredited [=tritomite-(Ce)]" according to Pasero et al. (2010).


Unique Identifiers

IMA Formula:
Ce5(SiO4,BO4)3(OH,O)
First published:
1887

Classification of Melanocerite-(Ce)
Dana 8th ed.:
54.2.5.3

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

Hey's CIM Ref.:
17.5.20

17 : Silicates Containing other Anions
5 : Borosilicates

Mineral Symbols
Colour:
Brown to black
Comment:
Yellow translucent in thin splinters
Streak:
Pale brown
Hardness:
5 - 6 onMohs scale
Hardness Data:
Measured
Tenacity:
Brittle
Cleavage:
None Observed
None
Fracture:
Conchoidal
Density:
4.13 - 4.30 g/cm3 (Measured)    

Optical Data of Melanocerite-(Ce)
Surface Relief:
High

Chemistry of Melanocerite-(Ce)

Crystallography of Melanocerite-(Ce)
Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Geological Environment
General Appearance of Type Material:
Deepbrown to black platy crystals, from a few mm to a about 2 cm in size, embedded in feldspar
Place of Conservation of Type Material:
Natural History Museum, Stockholm, Sweden inventory nr 531071–72
Geological Setting of Type Material:
A syenite pegmatite dike

Synonyms of Melanocerite-(Ce)

Other Language Names for Melanocerite-(Ce)

Varieties of Melanocerite-(Ce)CaryoceritePossibly a thorian Melanocerite-(Ce).
First described by Brögger (1890) from the Arøy skerries, Langesundsfjord, Vestfold, Norway.

FreyaliteThorium-rich variety of melanocerite-(Ce) which has been altered with subsequent leaching of Na,Ca,and F.

Common AssociatesMon. 2/m :P21/b9.AJ.Arrheniusite-(Ce)CaMg[(Ce7Y3)Ca5](SiO4)4(Si2B3AsO18)(BO3)F11Trig. 3m :R3m9.AJ.05Ominelite(Fe2+,Mg)(Al,Fe3+)3(SiO4)(BO3)O2Orth.mmm(2/m2/m2/m)9.AJ.05Grandidierite(Mg,Fe2+)(Al,Fe3+)3(SiO4)(BO3)O2Orth.mmm(2/m2/m2/m)9.AJ.10DumortieriteAl(Al2O)(Al2O)2(SiO4)3(BO3)Orth.mmm(2/m2/m2/m)9.AJ.10Nioboholtite(Nb0.6◻0.4)Al6BSi3O18Orth.mmm(2/m2/m2/m) :Pbcm9.AJ.10Titanoholtite(Ti0.75◻0.25)Al6BSi3O18Orth.mmm(2/m2/m2/m) :Pbcm9.AJ.10Holtite(Ta0.6◻0.4)Al6BSi3O18(O,OH)2.25Orth.mmm(2/m2/m2/m) :Pnma9.AJ.10MagnesiodumortieriteMg(Al2OH)(Al2O)2(SiO4)3(BO3)Orth.mmm(2/m2/m2/m)9.AJ.15GarrelsiteBa3NaSi2B7O16(OH)4Mon. 2/m :B2/b9.AJ.20Muromontitenear Be2FeY2Si3O129.AJ.20Gadolinite-(Nd)Nd2Fe2+Be2O2(SiO4)2Mon. 2/m :P21/b9.AJ.20DatoliteCaB(SiO4)(OH)Mon. 2/m :P21/b9.AJ.20Gadolinite-(Ce)(Ce,La,Nd,Y)2Fe2+Be2Si2O10Mon. 2/m9.AJ.20Gadolinite-(Y)Y2Fe2+Be2Si2O10Mon. 2/m :P21/b9.AJ.20Unnamed (OH-analogue of Gadolinite-(Y))(Y,Ca)2(Fe,◻)Be2Si2O8(OH,O)2Mon. 2/m9.AJ.20Hingganite-(Ce)(Ce,REE)2(◻,Fe2+)Be2[SiO4]2(OH)2Mon. 2/m :P21/b9.AJ.20Hingganite-(Y)(Y,REE,Ca)2(◻,Fe2+)Be2[SiO4]2(OH)2Mon. 2/m :P21/b9.AJ.20Hingganite-(Yb)(Yb,Y,REE)2◻Be2[SiO4]2(OH)2Mon. 2/m :P21/b9.AJ.20HomiliteCa2(Fe2+,Mg)B2Si2O10Mon. 2/m :P21/b9.AJ.20Minasgeraisite-(Y)(Ca2Y2)◻2(Be2B2)[SiO4]4(OH)4Tric. 1 :P19.AJ.20Calcybeborosilite-(Y)(Y,Ca)2(◻,Fe2+)(B,Be)2[SiO4]2(OH,O)2Mon.9.AJ.25Stillwellite-(Ce)(Ce,La,Ca)BSiO5Trig. 3 :P319.AJ.30Cappelenite-(Y)Ba(Y,Ce)6Si3B6O24F2Trig. 3 :P39.AJ.35Laptevite-(Ce)Ca6(Fe2+,Mn2+)Y3REE7(SiO4)3(PO4)(B3Si3O18)(BO3)F11Trig. 3m :R3m9.AJ.35Proshchenkoite-(Y)Ca(Y,REE,Ca,Na,Mn)15Fe2+(P,Si)Si6B3O34F14Trig. 3m :R3m9.AJ.35Okanoganite-(Y)(Na,Ca)3(Y,Ce)12Si6B2O27F14Trig. 3m :R3m9.AJ.35Hundholmenite-(Y)(Y,REE,Ca,Na)15(Al,Fe3+)(CaxAs3+1-x)(Si,As5+)Si6B3(O,F)48Trig. 3m :R3m9.AJ.35Vicanite-(Ce)(Ca,Ce,La,Th)15As5+(As3+0.5,Na0.5)Fe3+Si6B4O40F7Trig. 3m :R3m9.AJ.40JadariteLiNaSiB3O7(OH)Mon. 2/m

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    • References for Melanocerite-(Ce)ⓘBancroft area162-165.+1 other referenceRichard Gunter Collection.Royal Ontario Museum specimen M22568GSC misc report 39
    China
     
    Dahlkamp (2009)
    Czech Republic
     
    Tvrdý et al. (2021)
    Norway
     
    Andersen et al. (1985)Andersen et al. (1996)Brøgger (1890, January)Brögger (1887)+1 other referenceBrøgger (1890, January)
    Romania
     
    Pál Molnár (2000)
    Russia
     
    Vladykin et al. (2017)
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