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Fenaksite

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Big Photo

Rasvumchorr Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
© O. Dziallas

Show Fenaksite Photos (6)



Formula:
(K,Na)
 
4
(Fe,Mn)
 
2
(Si
 
4
O
 
10
)
 
2
(OH,F)
System:TriclinicHardness:5 - 5½
Name:Named for its chemical composition (Fe, Na, K, Si).
This page provides mineralogical data about Fenaksite.

Classification of Fenaksite

IMA status:Approved
Strunz 8th edition ID:8/H.04-10
Nickel-Strunz 10th (pending) edition ID:9.DG.70

9 : SILICATES (Germanates)
D : Inosilicates
G : Inosilicates with 3-periodic single and multiple chains
Dana 8th edition ID:70.1.1.2

70 : INOSILICATES Column or Tube Structures
1 : Column or Tube Structures with columnar silicate units
Hey's CIM Ref.:14.20.8

14 : Silicates not Containing Aluminum
20 : Silicates of Fe and alkali metals
mindat.org URL:http://www.mindat.org/min-1475.html
Please feel free to link to this page.

Type Occurrence of Fenaksite

Type Locality:Material'naya Adit, Yukspor Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
Year of Discovery:1959

Physical Properties of Fenaksite

Hardness (Mohs):5 - 5½

Crystallography of Fenaksite

Crystal System:Triclinic
Cell Parameters:a = 8.2Å, b = 9.97Å, c = 6.97Å
α = 98.58°, β = 114.47°, γ = 105.02°
Ratio:a:b:c = 0.822 : 1 : 0.699
Unit Cell Volume:V 479.12 ų (Calculated from Unit Cell)

Optical Data of Fenaksite

Type:Biaxial (+)
RI values: nα = 1.541 nβ = 1.560 nγ = 1.567
2V:Measured: 84° , Calculated: 60°
Maximum Birefringence:δ = 0.026

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Dispersion:weak

Chemical Properties of Fenaksite

Formula:
(K,Na)
 
4
(Fe,Mn)
 
2
(Si
 
4
O
 
10
)
 
2
(OH,F)
Essential elements:Fe, H, K, O, Si
All elements listed in formula:F, Fe, H, K, Mn, Na, O, Si
Common Impurities:Ti,Al,Mg

Relationship of Fenaksite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.DG.05Bustamite
CaMn
2+
 
(Si
 
2
O
 
6
)
9.DG.05Ferrobustamite
Ca(Fe
2+
 
,Ca,Mn
2+
 
)(Si
 
2
O
 
6
)
9.DG.05Pectolite
NaCa
 
2
(HSi
 
3
O
 
9
)
9.DG.05Sérandite
Na(Mn
2+
 
,Ca)
 
2
(HSi
 
3
O
 
9
)
9.DG.05Wollastonite
CaSiO
 
3
9.DG.05Wollastonite-1A
CaSiO
 
3
9.DG.07Cascandite
Ca(Sc,Fe
3+
 
)(HSi
 
3
O
 
9
)
9.DG.08Plombièrite
Ca
 
5
(HSi
 
3
O
 
9
)
 
2
 · 7H
 
2
O
9.DG.10Clinotobermorite
Ca
 
5
(Si
 
6
O
 
17
) · 5H
 
2
O
9.DG.10Riversideite
Ca
 
5
(HSi
 
3
O
 
9
)
 
2
 · 2H
 
2
O
9.DG.10Tobermorite
Ca
 
4+x
(H
 
2-2x
Si
 
6
O
 
17
) · 5H
 
2
O
9.DG.15Foshagite
Ca
 
4
(Si
 
3
O
 
9
)(OH)
 
2
9.DG.20Jennite
Ca
 
9
(Si
 
3
O
 
9
)
 
2
(OH)
 
8
 · 8H
 
2
O
9.DG.25Paraumbite
K
 
3
Zr
 
2
H(Si
 
3
O
 
9
)
 
2
 · nH
 
2
O
9.DG.25Umbite
K
 
2
(Zr,Ti)Si
 
3
O
 
9
 · H
 
2
O
9.DG.30Sørensenite
Na
 
4
SnBe
 
2
Si
 
6
O
 
16
(OH)
 
4
9.DG.35Xonotlite
Ca
 
6
(Si
 
6
O
 
17
)(OH)
 
2
9.DG.40Hillebrandite
Ca
 
2
(SiO
 
3
)(OH)
 
2
9.DG.45Zorite
Na
 
8
(Ti,Nb)
 
5
(Si
 
6
O
 
17
)
 
2
(OH,O)
 
5
 · 14H
 
2
O
9.DG.45Chivruaiite
Ca
 
4
(Ti,Nb)
 
5
(Si
 
6
O
 
17
)
 
2
(OH,O)
 
5
 · 13-14H
 
2
O
9.DG.50Haineaultite
(Na,Ca)
 
5
Ca(Ti,Nb)
 
5
(Si
 
6
O
 
17
)
 
2
(OH,F)
 
8
 · 5H
 
2
O
9.DG.55Epididymite
Na
 
2
Be
 
2
Si
 
6
O
 
15
 · H
 
2
O
9.DG.60Eudidymite
Na
 
2
Be
 
2
Si
 
6
O
 
15
 · H
 
2
O
9.DG.65Elpidite
Na
 
2
ZrSi
 
6
O
 
15
 · 3H
 
2
O
9.DG.70Litidionite
CuNaKSi
 
4
O
 
10
9.DG.70Manaksite
KNaMnSi
 
4
O
 
10
9.DG.75Tinaksite
K
 
2
Na(Ca,Mn
2+
 
)
 
2
Ti[O|Si
 
7
O
 
18
(OH)]
9.DG.75Tokkoite
K
 
2
Ca
 
4
Si
 
7
O
 
17
(O,OH,F)
 
4
9.DG.75Senkevichite
CsKNaCa
 
2
Ti[O|Si
 
7
O
 
18
(OH)]
9.DG.80Canasite
K
 
2
Na
 
4
Ca
 
5
(Si
 
12
O
 
30
(OH,F)
 
4
9.DG.80Fluorcanasite
K
 
3
Na
 
3
Ca
 
5
Si
 
12
O
 
30
F
 
4
 · H
 
2
O
9.DG.85Miserite
K(Ca,Ce)
 
4
Si
 
5
O
 
13
(OH)
 
3
9.DG.90Frankamenite
K
 
3
Na
 
3
Ca
 
5
(Si
 
12
O
 
30
)(F,OH)
 
4
 · H
 
2
O
9.DG.92Charoite
(K,Sr)
 
15-16
(Ca,Na)
 
32
[Si
 
6
O
 
11
(O,OH)
 
6
]
 
2
[Si
 
12
O
 
18
(O,OH)
 
12
]
 
2
[Si
 
17
O
 
25
(O,OH)
 
18
]
 
2
(OH,F)
 
4
 · ~3H
 
2
O
9.DG.95Yuksporite
(K,Ba)NaCa
 
2
(Si,Ti)
 
4
O
 
11
(F,OH) · H
 
2
O
9.DG.97Eveslogite
(Na,K,Ca,Sr,Ba)
 
48
 [(Ti,Nb,Mn,Fe
2+
 
)
 
12
Si
 
48
O
 
144
(OH)
 
12
](F,OH,Cl)
 
14
Related Minerals - Hey's Index Grouping:

- +
14.20.1Emeleusite
Li
 
2
Na
 
4
Fe
 
2
Si
 
12
O
 
30
14.20.2Aegirine
NaFe
3+
 
Si
 
2
O
 
6
14.20.4Wilkinsonite
Na
 
2
Fe
2+
4
Fe
3+
2
(Si
 
6
O
 
18
)O
 
2
14.20.5Tuperssuatsiaite
Na
 
2
Fe
 
3
Si
 
8
O
 
20
(OH)
 
2
 · 4H
 
2
O
14.20.6Riebeckite
◻[Na
 
2
][Fe
2+
3
Fe
3+
2
]Si
 
8
O
 
22
(OH)
 
2
14.20.7 Ferri-annite
14.20.9Montdorite
(K,Na)
 
2
(Fe
2+
 
,Mn
2+
 
,Mg)
 
5
(Si
 
4
O
 
10
)
 
2
(OH,F)
 
4

Other Names for Fenaksite

Synonyms:
PhenaksitePhenaxite
Other Languages:
German:Fenaksit
Phenaksit
Phenaxit
Russian:Фенаксит
Spanish:Fenaksita

Other Information

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

References for Fenaksite

Reference List:

- +
I.V. Rozhdestvenskaya, I.I. Bannova, L.V. Nikishova, and T.V. Soboleva (2004): The crystal structure of fenaksite K2Na2Fe2Si8O20. Transactions (Doklady) of the Russian Academy of Sciences/Earth Science Section, 398, 1029-1033.

American Mineralogist: 45: 252.

Trudy Mineralogicheskogo Muzeya Academii Nauk SSSR: 9: 152-157.

Doklady Akademii Nauk SSSR: 329: 212-215.

Acta Crystallographica: B33: 1071-1075.

Internet Links for Fenaksite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Fenaksite details from Handbook of Mineralogy (PDF)
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    • Localities for Fenaksite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Portugal
     
    • Vila Real District
      • Chaves
        • Vidago
    		Seixigal granite pegmatite (NE Portugal): Structural analysis and general evolution of an outergranite - pegmatite - innergranite stockscheider - M. F. C. PEREIRA, C. LEAL GOMES & L. A. AIRES-BARROS
    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
          • Khibiny Massif
    		Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
    [World of Stones 95:5-6, p64]
    Takai, Y., Uehara, S., Inoo, T. (2011) Minerals from Khibiny, Kola, Russia. Chigaku Kenkyu, 60 (1), 41-46.
    O Dziallas collection; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
    Sokolova et al (2005) New Data on Minerals Vol 40 pp115-118
            • Vuonnemiok River Valley
    		Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
            • Yukspor Mt
    		Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
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