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BaAl2Si2(O,OH)8 · H2O
Colourless, green, brown
2 - 3
From Cymru (Wales).
This page provides mineralogical data about Cymrite.

Classification of Cymrite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"

9 : SILICATES (Germanates)
E : Phyllosilicates
G : Double nets with 6-membered and larger rings

78 : Unclassified Silicates
1 : Miscellaneous

16 : Silicates Containing Aluminum and other Metals
12 : Aluminosilicates of Sr, Ba and Zn URL:
Please feel free to link to this page.

Type Occurrence of Cymrite

Year of Discovery:

Physical Properties of Cymrite

Vitreous, Silky
Diaphaneity (Transparency):
Colourless, green, brown
Green and brown colours are caused by inclusions of alteration products.
Hardness (Mohs):
2 - 3

Crystallography of Cymrite

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

Optical Data of Cymrite

Biaxial (-)
RI values:
nα = 1.611 nβ = 1.619 nγ = 1.621
Max Birefringence:
δ = 0.010
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
relatively strong

Chemical Properties of Cymrite

BaAl2Si2(O,OH)8 · H2O
Essential elements:
All elements listed in formula:
Common Impurities:

Relationship of Cymrite to other Species

9.EG.25SträtlingiteCa2Al2SiO7 · 8H2O
9.EG.25VertumniteCa4Al4Si4O6(OH)24 · 3H2O
9.EG.30Eggletonite(Na,K,Ca)2(Mn,Fe)8(Si,Al)12O29(OH)7 · 11H2O
9.EG.30Ganophyllite(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O
9.EG.30Tamaite(Ca,K,Ba,Na)3-4Mn24(Si,Al)40(O,OH)112 · 21H2O
9.EG.40Franklinphilite(K,Na)4(Mn,Zn,Mg,Fe)48(Si,Al)72(O,OH)216 · 6H2O
9.EG.40LennilenapeiteK6-7(Mg,Mn,Fe,Zn)48(Si,Al)72(O,OH)216 · 16H2O
9.EG.40Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al,Fe3+)8(Si,Al)12(O,OH)36 · nH2O
9.EG.45Tuscanite(K(Ca,Na)6(Si,Al)10O22[SO4,CO3,(OH)2] · H2O
9.EG.60HyttsjöitePb18Ba2Ca5Mn22+Fe23+Si30O90Cl · 6H2O
9.EG.65ArmbrusteriteK5Na7Mn15[(Si9O22)4](OH)10 · 4H2O
9.EG.75BannisteriteCa0.5(K,Na)0.5(Mn,Fe,Zn)10(Si,Al)16O38(OH)8 · 5.5H2O
16.12.7EdingtoniteBa[Al2Si3O10] · 4H2O
16.12.9Harmotome(Ba0.5,Ca0.5,K,Na)5[Al5Si11O32] · 12H2O
16.12.12ArmeniteBaCa2Al6Si9O30 · 2H2O
16.12.13Wellsite(Ba,Ca,K2)Al2Si6O16 · 6H2O
16.12.14Merlinoite(K,Na)5(Ca,Ba)2Al9Si23O64 · 23H2O
16.12.17SauconiteNa0.3Zn3((Si,Al)4O10)(OH)2 · 4H2O

Other Names for Cymrite

Name in Other Languages:
Simplified Chinese:铝硅钡石

Other Information

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 Cymrite

Reference List:
American Mineralogist: 35: 135.

American Mineralogist: 49: 158-165.

Doklady Akademii Nauk SSSR: 169: 201-203.

Sorokhtina, N.V., Chukanov, N.V., Voloshin, A.V., Pakhomovsky, Y.A., Bogdanova, A.N., and Moiseev, M.M. (2008): Cymrite as an Indicator of High Barium Activity in the Formation of Hydrothermal Rocks Related to Carbonatites of the Kola Peninsula. Geology of Ore Deposits 50(7), 620-628.

N. B. Bolotina, R. K. Rastsvetaeva and A. A. Kashaev (2010): Refinement of the twinned structure of cymrite from the Ruby Creek deposit (Alaska). Crystallography Reports 55, 569-574.

Internet Links for Cymrite

Localities for Cymrite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Burma (Myanmar)
Xiaoli Wang and Xinqiang Yuan (2006): Journal of Gems & Gemmology 9(2), 30-33
  • Kachin State
    • Mohnyin District (Moe Hnyin District)
      • Hpakant Township (Hpakan; Phakant; Phakan)
Shi, G., Harlow, G.E., Wang, J. Wang, J., Ng, E., Wang, X., Cao, G. & Cui, W. (2012): Mineralogy of jadeitite and related rocks from Myanmar:a review with new data. Eur. J. Mineral. 24, 345–370
  • Yukon Territory
    • Watson Lake Mining District
      • Macmillan Pass
Econ Geol (1989)84:841-856
  • Gansu Province
    • Longnan Prefecture
      • Cheng Co.
Can. J. Earth Sci. 44: 479–492 (2007)
  • Shaanxi Province
    • Ankang Prefecture
      • Hanbin District
Shenghua Wu, Jiajun Liu, Zhenjiang Liu, Degao Zhai, and Meijuan Yao (2010): Geology in China 37(5), 1469-1479
Czech Republic
  • Moravia (Mähren; Maehren)
    • Moravia-Silesia Region
      • Bruntál
Staňková, J. et al.: Cymrit z ložiska Pb-Zn-rud u Horního Benešova. Časopis pro mineralogii a geologii, 1989, roč. 34, č. 2, s. 137-150.
      • 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.
    • Olomouc Region
Petr Paulis (2001): Die interessanten mineralogische Fundstellen in Mahren und Schlesien; Kuttna, Kutná Hora p69-73
  • Aegean Islands Department (Aiyaíon)
    • Kykládes Prefecture
      • Cyclade Islands (Cyclades; Kikladhes; Nomos Kikladhon)
        • Andros Island
Reinecke, T. (1982): Contributions to Mineralogy and Petrology 79, 333-336.
  • Motagua Valley
Mikhail Ostrooumov and Alfredo Victoria Morales (2010) Mexican jadeite-bearing rock: a first mineralogical and gemmological approach. The Journal of Gemmology, Vol. 32, No. 1–4.
  • Tuscany
    • Lucca Province
      • Apuan Alps
        • Stazzema
          • Sant'Anna di Stazzema
Biagioni, C. & Orlandi, P. (2010). Cymrite and benstonite from the Monte Arsiccio mine (Apuan Alps, Tuscany, Italy): first Italian occurrence. Plinius, 36, 365.
  • Honshu Island
    • Kanto Region
      • Gunma Prefecture
        • Kiryuu City
Takahashi, S. (2009) Suisyou, 20, 6-7.
      • Tokyo Metropolis
        • Nishi-Tama-gun
          • Okutama-cho
Matsubara, S. (1985) Bulletin of the National Science Museum, 11, 37-95.; Matsubara S, Miyawaki R, Yokoyama K, Shimizu M, Imai H (2004) Tokyoite, Ba2Mn3+(VO4)2(OH), a new mineral from the Shiromaru mine, Okutama, Tokyo, Japan. Journal of Mineralogical and Petrological Sciences 99, 363-367
    • Kinki Region
      • Kyoto Prefecture
        • Kyoto City
          • Ukyou-ku
Masutomi Museum specimen (Kyoto)
  • Kyushu Region
    • Oita Prefecture
      • Saiki City
Alfredo Petrov specimen
  • Shikoku Island
    • Kochi Prefecture
      • Konan City
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
  • Veles
Bulletin Scientifique, Section A: Sciences Naturelles, Techniques et Medicales (Zagreb) (1975), 20 (9-10), 274; V. Bermanec et al. (1993): "Zn-rich magnetoplumbite from Nezilovo, Macedonia", Eur. Journ. Mineral., 5, 957-960
      • Jakupica Mts
        • Babuna Valley
Bermanec et al, 1996
  • Bistrița-Năsăud Co.
    • Rodna Mtn (Rodnei Mtn)
Udubaşa, G., Nedelcu, L., Andăr, A., and Andăr, P. (1983): Mineralium Deposita 18, 519-528.
  • Harghita Co.
  • Northern Region
    • Arkhangel'skaja Oblast'
      • Novaya Zemlya District
        • Novaya Zemlya
Sorokhtina, N.V., Chukanov, N.V., Voloshin, A.V., Pakhomovsky, Y.A., Bogdanova, A.N., and Moiseev, M.M. (2008): Geology of Ore Deposits 50(7), 620-628.
    • Murmanskaja Oblast'
      • Kola Peninsula
        • Kovdor Massif
Sorokhtina, N.V., Chukanov, N.V., Voloshin, A.V., Pakhomovsky, Y.A., Bogdanova, A.N., and Moiseev, M.M. (2008): Geology of Ore Deposits 50(7), 620-628.
Sorokhtina, N.V., Chukanov, N.V., Voloshin, A.V., Pakhomovsky, Y.A., Bogdanova, A.N., and Moiseev, M.M. (2008): Geology of Ore Deposits 50(7), 620-628.
  • Western-Siberian Region
    • Polar Urals
Sorokhtina, N.V., Chukanov, N.V., Voloshin, A.V., Pakhomovsky, Y.A., Bogdanova, A.N., and Moiseev, M.M. (2008): Geology of Ore Deposits 50(7), 620-628.
Sorokhtina, N.V., Chukanov, N.V., Voloshin, A.V., Pakhomovsky, Y.A., Bogdanova, A.N., and Moiseev, M.M. (2008): Geology of Ore Deposits 50(7), 620-628.
Sorokhtina, N.V., Chukanov, N.V., Voloshin, A.V., Pakhomovsky, Y.A., Bogdanova, A.N., and Moiseev, M.M. (2008): Geology of Ore Deposits 50(7), 620-628.
South Africa
  • Northern Cape Province
    • Kalahari manganese field
      • Black Rock
Minerals of South Africa
      • Hotazel
Wilson, W.E. & Dunn, P.J., (1978) Famous localities: The Kalahari manganese field. Mineralogical Record 9(3) 137-153.
  • Andalusia
    • Huelva
      • Calañas
Aye, F., and Strauss, G.K. (1975): C. R. Acad. Sci. Paris 281(24), 1935-1938.
  • Castile and Leon
Moro, M.C., Cembranos, M.L., and Fernandez, A. (2001): Canadian Mineralogist 39, 1039-1051.
      • Losacino
        • Vide de Alba
Moro, M.C.,Cembranos,M.L. y Fernandez,A. (2001) Celsian, (Ba,K)-feldspar and cymrite from SEDEX barite deposits of Zamora, Spain. The Canadian Mineralogist, 39, 1039-1051
  • 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 district
        • Jakobsberg ore field
MinMag 58, 172
      • Persberg district
        • Pajsberg
Nysten, P. (2004): Harstigen ett mineralogisk eldorado i Bergslagen. Norsk Bergverksmuseum Skrift 28: 5-13
  • Wallis (Valais)
    • Anniviers Valley
      • Ayer
Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): Mineralienlexikon der Schweiz. Wepf (Basel), p. 128.; Ansermet, S. (2012): Mines et minéraux du Valais - II. Anniviers et Tourtemagne. With contributions by N. Meisser, Ed. Porte-plumes (Ayer)
  • Wales
    • Gwynedd
      • 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. ; UK Journal of mines & Minerals, number 29 pp47-48; UKJMM Vol.29 p.14
  • Alaska
    • North Slope Borough
Brosgé, W. F. (1960). Metasedimentary rocks in the south-central Brooks Range, Alaska. U. S. Geological Survey Prof. Paper, 400-B, 351-352.
    • Northwest Arctic Borough
      • Shungnak District
U.S. Geological Survey, 2008, Alaska Resource Data File (ARDF): U.S. Geological Survey Open-File Report 2008-1225.
        • Ruby Creek Prospect
U.S. Geological Survey, 2008, Alaska Resource Data File (ARDF): U.S. Geological Survey Open-File Report 2008-1225.
U.S. Geological Survey, 2008, Alaska Resource Data File (ARDF): U.S. Geological Survey Open-File Report 2008-1225.
    • 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.
      • Diablo Range
        • Panoche Pass
Essene, J. (1967). An occurrence of cymrite in the Franciscan Formation, California. The American Mineralogist, 52, 1885-1890.
    • Santa Clara Co.
      • Diablo Range
        • Pacheco Pass
Essene, E.J. (1967) An occurrence of Cymrite in the Franciscan formation, California. American Mineralogist: 52: 1885-1890; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 368.
  • Nevada
    • Humboldt Co.
      • Golconda District
NBMG Spec. Pub. 31 Minerals of Nevada
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