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Niobophyllite

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About NiobophylliteHide

Formula:
(K,Na)3(Fe,Mn)6(Nb,Ti)2Si8(O,OH,F)31
Hardness:
3 - 4
Crystal System:
Triclinic
Name:
From its Nb content and phyllos (φύλλον), Greek for leaf, in allusion to its foliated habit.

Classification of NiobophylliteHide

Approved
9.DC.05

9 : SILICATES (Germanates)
D : Inosilicates
C : Inosilicates with branched 2-periodic single chains; Si2O6 + 2SiO3 Si4O12
69.1.1.4

69 : INOSILICATES Chains with Side Branches or Loops
1 : Chains with Side Branches or Loops with (P=2, and N=4, 2 branches)
17.8.17

17 : Silicates Containing other Anions
8 : Silicates with niobate or tantalate

Physical Properties of NiobophylliteHide

Hardness:
3 - 4 on Mohs scale

Optical Data of NiobophylliteHide

Type:
Biaxial (-)
RI values:
nα = 1.724 nβ = 1.760 nγ = 1.772
2V:
Measured: 60° , Calculated: 58°
Max Birefringence:
δ = 0.048
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v medium

Chemical Properties of NiobophylliteHide

Formula:
(K,Na)3(Fe,Mn)6(Nb,Ti)2Si8(O,OH,F)31
IMA Formula:
K2NaFe2+7(Nb,Ti)2Si8O26(OH)4(F,O)
Common Impurities:
Al,Ta,Mg,Ca,H2O

Crystallography of NiobophylliteHide

Crystal System:
Triclinic
Cell Parameters:
a = 5.39 Å, b = 11.88 Å, c = 11.66 Å
α = 113.1°, β = 94.5°, γ = 103.1°
Ratio:
a:b:c = 0.454 : 1 : 0.981
Unit Cell V:
657.11 ų (Calculated from Unit Cell)

Type Occurrence of NiobophylliteHide

Synonyms of NiobophylliteHide

Other Language Names for NiobophylliteHide

Relationship of Niobophyllite to other SpeciesHide

Other Members of this group:
AstrophylliteK2NaFe2+7Ti2Si8O28(OH)4FTric. 1 : P1
BulgakiteLi2(Ca,Na)Fe2+7Ti2(Si4O12)2O2(OH)4(F,O)(H2O)2Tric. 1 : P1
Hydroastrophyllite(H3O,K,Ca)3(Fe,Mn)5-65Ti2Si8(O,OH)31Tric.
NalivkiniteLi2Na(Fe2+,Mn2+)7Ti2Si8O26(OH)4FTric. 1 : P1
Tarbagataite(K□)Ca(Fe2+,Mn)7Ti2(Si4O12)2O2(OH)5 Tric. 1 : P1
ZircophylliteK2NaFe2+7Zr2(Si4O12)2O2(OH)4FTric.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Aegirine6 photos of Niobophyllite associated with Aegirine on mindat.org.
Feldspar Group2 photos of Niobophyllite associated with Feldspar Group on mindat.org.
Hydroxycalciopyrochlore2 photos of Niobophyllite associated with Hydroxycalciopyrochlore on mindat.org.
Monazite-(Ce)2 photos of Niobophyllite associated with Monazite-(Ce) on mindat.org.
Zircon1 photo of Niobophyllite associated with Zircon on mindat.org.
K Feldspar1 photo of Niobophyllite associated with K Feldspar on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.DC.05AstrophylliteK2NaFe2+7Ti2Si8O28(OH)4FTric. 1 : P1
9.DC.05Hydroastrophyllite(H3O,K,Ca)3(Fe,Mn)5-65Ti2Si8(O,OH)31Tric.
9.DC.05Kupletskite(K,Na)3(Mn,Fe)7Ti2Si8O26(OH)4FTric.
9.DC.05LobanoviteK2Na(Fe2+4Mg2Na)Ti2(Si4O12)2O2(OH)4Mon. 2/m : B2/m
9.DC.05ZircophylliteK2NaFe2+7Zr2(Si4O12)2O2(OH)4FTric.
9.DC.05Kupletskite-(Cs)Cs2NaMn2+7Ti2(Si4O12)2O2(OH)4FTric.
9.DC.05NiobokupletskiteK2NaMn2+7(Nb,Ti)(Si4O12)2O2(OH)4(O,F)Tric. 1 : P1
9.DC.05NalivkiniteLi2Na(Fe2+,Mn2+)7Ti2Si8O26(OH)4FTric. 1 : P1
9.DC.05SveinbergeiteCa(Fe2+6Fe3+)Ti2(Si4O12)2O2(OH)5(H2O)4Tric. 1 : P1

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

69.1.1.1AstrophylliteK2NaFe2+7Ti2Si8O28(OH)4FTric. 1 : P1
69.1.1.2Kupletskite(K,Na)3(Mn,Fe)7Ti2Si8O26(OH)4FTric.
69.1.1.3Kupletskite-(Cs)Cs2NaMn2+7Ti2(Si4O12)2O2(OH)4FTric.
69.1.1.5ZircophylliteK2NaFe2+7Zr2(Si4O12)2O2(OH)4FTric.
69.1.1.5NalivkiniteLi2Na(Fe2+,Mn2+)7Ti2Si8O26(OH)4FTric. 1 : P1
69.1.1.6Hydroastrophyllite(H3O,K,Ca)3(Fe,Mn)5-65Ti2Si8(O,OH)31Tric.
69.1.1.6SveinbergeiteCa(Fe2+6Fe3+)Ti2(Si4O12)2O2(OH)5(H2O)4Tric. 1 : P1
69.1.1.7LobanoviteK2Na(Fe2+4Mg2Na)Ti2(Si4O12)2O2(OH)4Mon. 2/m : B2/m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

17.8.1EpistoliteNa2(Nb,Ti)2(Si2O7)O2 · nH2OTric.
17.8.2MurmaniteNa2Ti2(Si2O7)O2 · 2H2OTric.
17.8.3PerraultiteBaNaMn2+4Ti2(Si2O7)2O2(OH)2FMon. 2/m : B2/m
17.8.4Niocalite(Ca,Nb)4(Si2O7)(O,OH,F)2Mon.
17.8.5MongoliteCa4Nb6Si5O24(OH)10 · nH2OTet.
17.8.6FersmaniteCa4(Na,Ca)4(Ti,Nb)4(Si2O7)2O8F3Tric.
17.8.7Nacareniobsite-(Ce)NbNa3Ca3(Ce,REE )(Si2O7)2OF3Mon.
17.8.8Nenadkevichite(Na,◻)8Nb4(Si4O12)2(O,OH)4 · 8H2OOrth. mmm (2/m 2/m 2/m) : Pbam
17.8.9Natrokomarovite(Na,Ca,H)2Nb2Si2O10(OH,F)2 · H2OOrth.
17.8.10WöhleriteNaCa2(Zr,Nb)(Si2O7)(O,OH,F)2Mon. 2 : P21
17.8.11BelkoviteBa3(Nb,Ti)6(Si2O7)2O12Hex.
17.8.12BaotiteBa4Ti8Si4O28ClTet. 4/m : I41/a
17.8.13Shcherbakovite(K,Ba)KNa(Ti,Nb)2(Si4O12)O2Orth.
17.8.14Ilímaussite-(Ce)(Na,K)7-8(Ba,K)10Ce5(Nb,Ti)6(Si3O9)4(Si9O18)O6(O,OH)24Trig. 3 2 : R3 2
17.8.15Komarovite(Ca,Mn)Nb2[O3|Si2O7] · 3.5H2OOrth.
17.8.16Manganbelyankinite(Mn,Ca)(Ti,Nb)5O12 · 9H2O
17.8.18Caesium-Kupletskite(Cs,K,Na)3(Mn,Fe2+)7(Ti,Nb)2Si8O24(O,OH,F)7

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 NiobophylliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Nickel, E.H., J.F. Rowland, and D.J. Charette (1964) Niobophyllite - the niobium analogue of astrophyllite; a new mineral from Seal Lake, Labrador. Can. Mineral., 8, 40-52.
American Mineralogist (1965): 50: 263.

Internet Links for NiobophylliteHide

Localities for NiobophylliteHide

ⓘ - 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.
Canada
 
  • Newfoundland and Labrador
    • Labrador
Curtis, L.W. & Currie, K.L. (1977) Geology and petrology of the Red Wine complex, Central Labrador. GSC Bulletin 287, 61p. + maps
Nickel, E.H., J.F. Rowland, and D.J. Charette (1964) Niobophyllite - the niobium analogue of astrophyllite; a new mineral from Seal Lake, Labrador. Can. Mineral., 8, 40-52.
\"Rare Earth Element Mines, Deposits, and Occurrences,\" G.J. Orris and R.I. Grauch, Open File Report 02-189, U.S. Department of the Interior, U.S. Geological Survey, 2002.; GSC database locality No. 4100
Nickel, E.H., J.F. Rowland, and D.J. Charette (1964) Niobophyllite - the niobium analogue of astrophyllite; a new mineral from Seal Lake, Labrador. Can. Mineral., 8, 40-52.; GSC database locality No. 4101; Cámara, F., Sokolova, E., Hawthorne, F. C., Rowe, R., Grice, J. D., & Tait, K. T. (2013). Veblenite, K2〈 2Na (Fe2+ 5Fe3+ 4Mn2+ 7〈) Nb3Ti (Si2O7) 2 (Si8O22) 2O6 (OH) 10 (H2O) 3, a new mineral from Seal Lake, Newfoundland and Labrador: mineral description, crystal structure, and a new veblenite Si8O22 ribbon. Mineralogical Magazine, 77(7), 2955-2974.
A. Kerr (2010) Rare-earth-element (REE) mineralization in Labrador: A review of known environments and the geological context of current exploration activity. Newfoundland and Labrador Department of Natural Resources Current Research 2010 pp 109-143
Denmark
 
  • Greenland
    • Kujalleq
      • Narsaq
Soerensen, H. (2001): The Ilimaussaq alkaline complex, South Greenland: status of mineralogical research with new results, Geology of Greenland Survey Bulletin 190, GEUS; Petersen, O.V. (2001): List of all minerals identified in the Ilímaussaq alkaline complex, South Greenland. Geology of Greenland Survey Bulletin. 190, 25-33
Malawi
 
Jordi Fabre
  • Zomba District
Demartin, F.; Guastoni, A. & Pezzotta, F. (2003): Barylith, Niobophyllit & yttriumreicher Milarit- Neufunde aus den Pegmatiten von Zomba-Malosa, Malawi. Lapis 28 (1), 18-21; American Mineralogist, Volume 94, pages 1216–1222, 2009; Guastoni, A., & Pezzotta, F. (2007). REE-mineral phases replacing helvite, niobian-rutile, bastnäsite-(Ce) from alkaline pegmatites of Mount Malosa, Zomba District, Malawi. Granitic Pegmatites: the State of the Art. Memorias, 8, 42-43.
South Africa
 
  • North West Province
    • Bojanala Platinum District
      • Western Bushveld Complex
R. Liferovich - L. Horváth p.c. (2004)
Mineral and/or Locality  
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