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Armenite

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Isenwegg, Wasen Alp, Ganter valley, Simplon pass area, Brig, Wallis (Valais), Switzerland
© Stephan Wolfsried

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Formula:
BaCa
 
2
Al
 
6
Si
 
9
O
 
30
·2H
 
2
O
System:OrthorhombicColour:Colourless
Hardness:7½
This page provides mineralogical data about Armenite.

Classification of Armenite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:8/E.22-150
Nickel-Strunz 10th (pending) edition ID:9.CM.05

9 : SILICATES (Germanates)
C : Cyclosilicates
M : [Si6O18]12- 6-membered double rings (sechser-Doppelringe)
Dana 8th edition ID:63.2.1b.1

63 : CYCLOSILICATES Condensed Rings
2 : Condensed Rings (Milarite - Osumilite group)
Hey's CIM Ref.:16.12.12

16 : Silicates Containing Aluminum and other Metals
12 : Aluminosilicates of Sr, Ba and Zn
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Type Occurrence of Armenite

Type Locality:Armen Mine, Overberget Mine-field, Kongsberg Silver Mining District, Kongsberg, Buskerud, Norway
Year of Discovery:1939

Physical Properties of Armenite

Lustre:Vitreous
Colour:Colourless
Streak:White
Hardness (Mohs):7½

Crystallography of Armenite

Crystal System:Orthorhombic
Cell Parameters:a = 13.87Å, b = 18.66Å, c = 10.69Å
Ratio:a:b:c = 0.743 : 1 : 0.573
Unit Cell Volume:V 2,766.72 ų (Calculated from Unit Cell)

Optical Data of Armenite

Type:Biaxial (-)
RI values: nα = 1.550 nβ = 1.552 nγ = 1.556
2V:Measured: 59° to 60°, Calculated: 72°
Maximum Birefringence:δ = 0.006

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

Chemical Properties of Armenite

Formula:
BaCa
 
2
Al
 
6
Si
 
9
O
 
30
·2H
 
2
O
Essential elements:Al, Ba, Ca, H, O, Si
All elements listed in formula:Al, Ba, Ca, H, O, Si
Common Impurities:Sr,Na,K

Relationship of Armenite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.CM.05Brannockite
(K,Na)Li
 
3
Sn
 
2
Si
 
12
O
 
30
9.CM.05Chayesite
K(Mg,Fe)
 
4
FeSi
 
12
O
 
30
9.CM.05Darapiosite
KNa
 
2
Li(Mn,Zn)
 
2
ZrSi
 
12
O
 
30
9.CM.05Eifelite
KNa
 
3
Mg
 
4
Si
 
12
O
 
30
9.CM.05Merrihueite
(K,Na)
 
2
(Fe,Mg)
 
5
Si
 
12
O
 
30
9.CM.05Milarite
K
 
2
Ca
 
4
Al
 
2
Be
 
4
Si
 
24
O
 
60
·H
 
2
O
9.CM.05Osumilite-(Mg)
(K,Na)(Mg,Fe)
 
2
(Al,Fe)
 
3
(Si,Al)
 
12
O
 
30
·H
 
2
O
9.CM.05Osumilite
(K,Na)(Fe
2+
 
,Mg)
 
2
(Al,Fe
3+
 
)
 
3
(Si,Al)
 
12
O
 
30
9.CM.05Poudretteite
KNa
 
2
B
 
3
Si
 
12
O
 
30
9.CM.05Roedderite
(Na,K)
 
2
(Mg,Fe)
 
5
Si
 
12
O
 
30
9.CM.05Sogdianite
(K,Na)
 
2
(Li,Fe)
 
3
(Zr,Ti,Fe)Si
 
12
O
 
30
9.CM.05Sugilite
KNa
 
2
(Fe,Mn,Al)
 
2
Li
 
3
Si
 
12
O
 
30
9.CM.05Yagiite
(Na,K)
 
3
Mg
 
4
(Al,Mg)
 
6
(Si,Al)
 
24
O
 
60
9.CM.05Berezanskite
KLi
 
3
Ti
 
2
Si
 
12
O
 
30
9.CM.05Dusmatovite
K(K,Na,[ ])(Mn
2+
 
,Y,Zr)
 
2
(Zn,Li)
 
3
Si
 
12
O
 
30
9.CM.05Shibkovite
K(Ca,Mn,Na)
 
2
(K
 
2-x
,□
 
x
)
 
2
ZnSi
 
12
O
 
30
9.CM.05Almarudite
(K,Na)(Mn
2+
 
,Fe
2+
 
,Mg)
 
2
(Be,Al)
 
3
[Si
 
12
O
 
30
]
9.CM.05Trattnerite
([],K)(Mg, Fe
2+
 
)
 
3
Fe
3+
2
[Si
 
12
O
 
30
]
9.CM.05Oftedalite
(Sc,Ca,Mn
2+
 
)
 
2
K[(Be,Al)
 
3
Si
 
12
O
 
30
]
9.CM.10Faizievite
K
 
2
Na(Ca
 
6
Na)Ti
 
4
Li
 
6
[F
 
2
|Si
 
24
O
 
66
]
Related Minerals - Hey's Index Grouping:

- +
16.12.1Stronalsite
SrNa
 
2
[Al
 
2
Si
 
2
O
 
8
]
 
2
16.12.2Slawsonite
(Sr,Ca)[Al
 
2
Si
 
2
O
 
8
]
16.12.3Brewsterite
16.12.4Celsian
Ba[Al
 
2
Si
 
2
O
 
8
]
16.12.5Paracelsian
Ba[Al
 
2
Si
 
2
O
 
8
]
16.12.6Cymrite
BaAl
 
2
Si
 
2
(O,OH)
 
8
·H
 
2
O
16.12.7Edingtonite
Ba[Al
 
2
Si
 
3
O
 
10
] · 4H
 
2
O
16.12.8Banalsite
BaNa
 
2
[Al
 
2
Si
 
2
O
 
8
]
 
2
16.12.9Harmotome
(Ba
 
0.5
,Ca
 
0.5
,K,Na)
 
5
[Al
 
5
Si
 
11
O
 
32
] ·12H
 
2
O
16.12.10Hyalophane
(K,Ba)[Al(Si,Al)Si
 
2
O
 
8
]
16.12.11Balipholite
BaLiMg
 
2
Al
 
3
[(OH)
 
4
|Si
 
2
O
 
6
]
 
2
16.12.13Wellsite
(Ba,Ca,K
 
2
)Al
 
2
Si
 
6
O
 
16
·6H
 
2
O
16.12.14Merlinoite
(K,Na)
 
5
(Ca,Ba)
 
2
Al
 
9
Si
 
23
O
 
64
·23H
 
2
O
16.12.15Anandite
(Ba,K)(Fe
2+
 
,Mg)
 
3
[(O,OH)
 
2
|(Si,Al,Fe)
 
4
O
 
10
]
16.12.16Fraipontite
(Zn,Al)
 
3
[(OH)
 
4
|(Si,Al)
 
2
O
 
5
]
16.12.17Sauconite
Na
 
0.3
Zn
 
3
(Si,Al)
 
4
O
 
10
(OH)
 
2
·4H
 
2
O
16.12.18Minehillite
(K,Na)
 
2-3
Ca
 
28
Zn
 
4
Al
 
4
Si
 
40
O
 
112
(OH)
 
16
16.12.19Hendricksite
K(Zn,Mg,Mn
2+
 
)
 
3
[(OH)
 
2
|AlSi
 
3
O
 
10
]
16.12.20Baileychlore
(Zn,Fe,Al,Mg)
 
6
(Si,Al)
 
4
O
 
10
(OH)
 
8

Other Names for Armenite

Synonyms:
Calciocelsian
Other Languages:
German:Armenit
Russian:Арменит
Spanish:Armenita

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 Armenite

Reference List:American Mineralogist: 26: 235.

American Mineralogist: 77: 422-430, 1119.

Internet Links for Armenite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Armenite in the Natural History Museum (London) online catalogue
  • Armenite details from Handbook of Mineralogy (PDF)
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    Localities for Armenite

    Hide Locality List
    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.
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    (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.
    Australia
     
    • New South Wales
      • Yancowinna Co.
    		Birch BH Book
    Canada
     
    • Québec
      • Témiscamingue Co.
    		Canadian Mineralogist 22, 453-464 (1984)
    Italy
     
    • Piedmont
      • Verbano-Cusio-Ossola Province
        • Mergozzo
          • Candoglia
    		Piccoli, G.C., Maletto, G., Bosio, P., Lombardo, B. (2007). Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" Alba, Ed., Alba (Cuneo) 607 pp.
    • Sardinia
      • Carbonia-Iglesias Province
        • Fluminimaggiore
    		• Stara, P. Rizzo, R., Tanca, G., Vinci A. (1994): Su Zurfuru. 1° parte. Rivista Mineralogica Italiana, 4/1993, 215-236.
    Norway
     
    • Buskerud
      • Kongsberg
        • Kongsberg Silver Mining District
          • Overberget Mine-field
    		Neumann, H.(1941): " Armenite, a water-bearing barium-calcium-alumo-silicate". Norsk Geologisk Tidskrift 21, 19-24
    R. Kristiansen (2005) "Milarittgruppens mineraler i Norge" (The Milaritegroup minerals in Norway), Bergverksmuseets skrifter #30, p. 21.; Mineralogical Record (2001) 32:181-205
    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
    		www.koeln.netsurf.de/~w.steffens/lovo.htm
    South Korea
     
    • Daejeon
      • Daejeon-gun
    		Gi Young Jeong (2006): Mineralium Deposita 41, 469-481.
    Spain
     
    • Catalonia
      • Tarragona
        • Conca de Barberà
          • Vimbodí
            • Poblet Monastery
    		C.. Canet et al. , The Canadian Mineralogist, 2003, V41, pp. 581-595
    C.. Canet et al. , The Canadian Mineralogist, 2003, V41, pp. 581-595
    C.. Canet et al. , The Canadian Mineralogist, 2003, V41, pp. 581-595
    Switzerland
     
    • Wallis (Valais)
      • Brig
        • Simplon pass area
          • Ganter valley
            • Wasen Alp
    		Mineralogical Record (2001) 32:252
    UK
     
    • Scotland
      • Buchan Grampian (Aberdeenshire)
        • Braemar
    		BMS Database
    USA
     
    • Washington
      • King Co.
    Mineral and/or Locality
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