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Cymrite

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Benallt Mine (Tyddyn Meirion mine; Ty Canol mine), Rhiw, Llanfaelrhys, Lleyn Peninsula, Gwynedd (Caernarvonshire), Wales, UK
© Steve Rust

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Formula:
BaAl
 
2
Si
 
2
(O,OH)
 
8
·H
 
2
O
System:MonoclinicColour:Brown
Hardness:2 - 3
Name:From Cymru (Wales).
This page provides mineralogical data about Cymrite.

Classification of Cymrite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:8/H.38-60
Nickel-Strunz 10th (pending) edition ID:9.EG.05

9 : SILICATES (Germanates)
E : Phyllosilicates
G : Double nets with 6-membered and larger rings
Dana 8th edition ID:78.1.3.1

78 : Unclassified Silicates
1 : Miscellaneous
Hey's CIM Ref.:16.12.6

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

Type Locality:Benallt Mine (Tyddyn Meirion mine; Ty Canol mine), Rhiw, Llanfaelrhys, Lleyn Peninsula, Gwynedd (Caernarvonshire), Wales, UK
Year of Discovery:1949

Physical Properties of Cymrite

Lustre:Vitreous, Silky
Colour:Brown
Streak:White
Hardness (Mohs):2 - 3

Crystallography of Cymrite

Crystal System:Monoclinic
Cell Parameters:a = 5.32Å, b = 36.6Å, c = 7.66Å
β = 90°
Ratio:a:b:c = 0.145 : 1 : 0.209
Unit Cell Volume:V 1,491.49 ų (Calculated from Unit Cell)

Optical Data of Cymrite

Type:Biaxial (-)
RI values: nα = 1.611 nβ = 1.619 nγ = 1.621
Maximum Birefringence:δ = 0.010

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

Chemical Properties of Cymrite

Formula:
BaAl
 
2
Si
 
2
(O,OH)
 
8
·H
 
2
O
Essential elements:Al, Ba, H, O, Si
All elements listed in formula:Al, Ba, H, O, Si
Common Impurities:Fe,Mn,K

Relationship of Cymrite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.EG.10Naujakasite
(Na,K)
 
6
(Fe
2+
 
,Mn
2+
 
,Ca)(Al,Fe)
 
4
Si
 
8
O
 
26
9.EG.10Manganonaujakasite
Na
 
6
(Mn
2+
 
,Fe
2+
 
)Al
 
4
Si
 
8
O
 
26
9.EG.15Dmisteinbergite
Ca[Al
 
2
Si
 
2
O
 
8
]
9.EG.20Kampfite
Ba
 
6
[(Si,Al)O
 
2
]
 
8
(CO
 
3
)
 
2
Cl
 
2
(Cl,H
 
2
O)
 
2
9.EG.25Strätlingite
Ca
 
2
Al
 
2
SiO
 
7
·8H
 
2
O
9.EG.25Vertumnite
Ca
 
4
Al
 
4
Si
 
4
O
 
6
(OH)
 
24
·3H
 
2
O
9.EG.30Eggletonite
(Na,K,Ca)
 
2
(Mn,Fe)
 
8
(Si,Al)
 
12
O
 
29
(OH)
 
7
·11H
 
2
O
9.EG.30Ganophyllite
(K,Na,Ca)
 
2
Mn
 
8
(Si,Al)
 
12
(O,OH)
 
32
·8H
 
2
O
9.EG.30Tamaite
(Ca,K,Ba,Na)
 
3-4
Mn
 
24
(Si,Al)
 
40
(O,OH)
 
112
·21H
 
2
O
9.EG.35Coombsite
K(Mn,Fe,Mg)
 
13
(Si,Al)
 
18
O
 
42
(OH)
 
14
9.EG.35Zussmanite
K(Fe,Mg,Mn)
 
13
(Si,Al)
 
18
O
 
42
(OH)
 
14
9.EG.40Franklinphilite
(K,Na)
 
4
(Mn,Zn,Mg,Fe)
 
48
(Si,Al)
 
72
(O,OH)
 
216
·6H
 
2
O
9.EG.40Lennilenapeite
K
 
6-7
(Mg,Mn,Fe,Zn)
 
48
(Si,Al)
 
72
(O,OH)
 
216
·16H
 
2
O
9.EG.40Parsettensite
K
 
1.2
Mn
 
8
(Si,Al)
 
12
O
 
26
(OH)
 
10
9.EG.40Stilpnomelane
K(Fe
2+
 
,Mg,Fe
3+
 
)
 
8
(Si,Al)
 
12
(O,OH)
 
27
9.EG.45Latiumite
K
 
2
Ca
 
6
(Si,Al)
 
11
O
 
25
(SO
 
4
,CO
 
3
)
9.EG.45Tuscanite
(K(Ca,Na)
 
6
(Si,Al)
 
10
O
 
22
[SO
 
4
,CO
 
3
,(OH)
 
2
]·H
 
2
O
9.EG.50Jagoite
(Pb,Ca)
 
3
FeSi
 
3
O
 
10
(Cl,OH)
9.EG.55Wickenburgite
CaPb
 
3
Al
 
2
Si
 
10
O
 
24
(OH)
 
6
9.EG.60Hyttsjöite
Pb
 
18
Ba
 
2
Ca
 
5
Mn
2+
2
Fe
3+
2
Si
 
30
O
 
90
Cl·6H
 
2
O
9.EG.65Armbrusterite
K
 
5
Na
 
7
Mn
 
15
[(OH)
 
10
|(Si
 
9
O
 
22
)
 
4
] · 4H
 
2
O
9.EG.70Britvinite
[Pb
 
7
(OH)
 
3
F(BO
 
3
)
 
2
(CO
 
3
)][Mg
 
4.5
(OH)
 
3
(Si
 
5
O
 
14
)]
9.EG.75Bannisterite
Ca
 
0.5
(K,Na)
 
0.5
(Mn,Fe,Zn)
 
10
(Si,Al)
 
16
O
 
38
(OH)
 
8
·5.5H
 
2
O
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
]
16.12.7Edingtonite
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
16.12.12Armenite
BaCa
 
2
Al
 
6
Si
 
9
O
 
30
·2H
 
2
O
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 Cymrite

Other Languages:
German:Cymrit
Russian:Кимрит
Spanish:Cymrita

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 Cymrite

Reference List:American Mineralogist: 35: 135.

American Mineralogist: 49: 158-165.

Doklady Akademii Nauk SSSR: 169: 201-203.

Articles/Blogs about Cymrite

Internet Links for Cymrite

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

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    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.
    Czech Republic
     
    • Moravia (Mähren; Maehren)
      • Olomouc Region
        • Javorník
          • Rýmařov
    		Fojt, B. et al.: Paragenetická charakteristika ložisek Pb-Zn rud v širším okolí Horního Města u Rýmařova. Acta Mus. Moraviae, Sci. geol., 2007, 92, 3-57.
    Petr Paulis (2001): Die interessanten mineralogische Fundstellen in Mahren und Schlesien; Kuttna, Kutná Hora p69-73
    Italy
     
    • Liguria
      • La Spezia Province
        • Vara Valley
          • Borghetto Vara
    Japan
     
    • Honshu Island
      • Kanto Region
        • Tokyo Prefecture
          • Nishi-Tama-gun
            • Okutama
    		Matsubara, S. (1985) Bulletin of the National Science Museum, 11, 37-95.
    • Shikoku Island
      • Kochi Prefecture
        • Kagami
    		Handbook of Mineralogy, (c) 2001.
    New Zealand
     
    • South Island
      • Nelson
    		Soong, R., & Olivecrona, J. A. (1975). An occurrence of cymrite in black shale, north-west Nelson, South Island, New Zealand. Mineralogical Magazine, 40, 311-312. Railton, G.L. & Watters, W.A., Minerals of New Zealand, New Zealand Geological Survey Bull. #104 (1990).
    Republic of Macedonia
     
    • Pelagonian massif
    		V. Bermanec et al. : "Zn-rich magnetoplumbite from Nezilovo, Macedonia", Eur. Journ. Mineral., 1993, 5, pp 957-960
    South Africa
     
    • Northern Cape Province
      • Kalahari manganese fields
        • Black Rock
    		Minerals of South Africa
        • Hotazel
    		MinRecord 9:137-153
    Sweden
     
    • Värmland
      • Filipstad
    		Nysten, P., Holtstam, D. and Jonsson, E. (1999) The Långban minerals. In Långban - The mines,their minerals, geology and explorers (D. Holtstam and J. Langhof, eds.), Swedish Museum of Natural History and Raster Förlag, Stockholm & Chr. Weise Verlag, Munich, pp. 89-183. ; K:Gatedal
        • Nordmark
    		MinMag 58, 172
        • Pajsberg
    		Kjell Gatedal
    Switzerland
     
    • Wallis (Valais)
      • Anniviers Valley
        • Ayer
    		Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): Mineralienlexikon der Schweiz. Wepf (Basel), p. 128.
    UK
     
    • Wales
      • Gwynedd (Caernarvonshire)
        • Lleyn Peninsula
          • Llanfaelrhys
            • Rhiw
    		Campbell Smith, W., Bannister, F. A., & Hey, M. H. (1949). Cymrite, a new barium mineral from the Benallt manganese mine, Rhiw, Carnarvoshire. Mineralogical Magazine, 28, 676-681.
    USA
     
    • Alaska
    		Brosgé, W. F. (1960). Metasedimentary rocks in the south-central Brooks Range, Alaska. U. S. Geological Survey Prof. Paper, 400-B, 351-352.
      • Yukon-Koyukuk Borough
        • Amber District
    		Runnells, D.D. (1964). Cymrite in a copper deposit, Brooks Range, Alaska. The American Mineralogist, 49, 158-165.
    • California
      • San Benito Co.
    		Essene, J. (1967). An occurrence of cymrite in the Franciscan Formation, California. The American Mineralogist, 52, 1885-1890.
    • Nevada
      • Humboldt Co.
        • Golconda District
    		NBMG Spec. Pub. 31 Minerals of Nevada
    Mineral and/or Locality
    Google
     
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