Cymrite
A valid IMA mineral species - grandfathered
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About Cymrite
Formula:
BaAl2Si2(O,OH)8 · H2O
Colour:
Colourless, green, brown
Lustre:
Vitreous, Silky
Hardness:
2 - 3
Specific Gravity:
3.413
Crystal System:
Monoclinic
Name:
Named for the country of Wales, United Kingdom, which includes the type locality. Wales, in Welsh, is Cymru.
Type Locality:
The UHP phase 'K-cymrite' is the unapproved K analogue. Compare the chemically related UM1990-58-SiO:AlBaH.
Chemically very similar to celsian and paracelsian.
A similar aluminosilicate anion is present, e.g., in the structure of kampfite and burckhardtite.
Chemically very similar to celsian and paracelsian.
A similar aluminosilicate anion is present, e.g., in the structure of kampfite and burckhardtite.
Unique Identifiers
Mindat ID:
1205
Long-form identifier:
mindat:1:1:1205:4
GUID
(UUID V4):
(UUID V4):
a4361b0c-03a8-452c-9529-3a7298849a8f
IMA Classification of Cymrite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Ba(Si,Al)4(O,OH)8 · H2O
Classification of Cymrite
9.EG.05
9 : SILICATES (Germanates)
E : Phyllosilicates
G : Double nets with 6-membered and larger rings
9 : SILICATES (Germanates)
E : Phyllosilicates
G : Double nets with 6-membered and larger rings
78.1.3.1
78 : Unclassified Silicates
1 : Miscellaneous
78 : Unclassified Silicates
1 : Miscellaneous
16.12.6
16 : Silicates Containing Aluminum and other Metals
12 : Aluminosilicates of Sr, Ba and Zn
16 : Silicates Containing Aluminum and other Metals
12 : Aluminosilicates of Sr, Ba and Zn
Mineral Symbols
As of 2021 there are now IMAâCNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Cym | IMAâCNMNC | Warr, L.N. (2021). IMAâCNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Cymrite
Vitreous, Silky
Transparency:
Translucent
Colour:
Colourless, green, brown
Comment:
Green and brown colours are caused by inclusions of alteration products.
Streak:
White
Hardness:
2 - 3 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on {001}, imperfect on {110}
Perfect on {001}, imperfect on {110}
Fracture:
Irregular/Uneven
Density:
3.413 g/cm3 (Measured) 3.447 g/cm3 (Calculated)
Optical Data of Cymrite
Type:
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.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
relatively strong
Comments:
pseudouniaxial.
Chemistry of Cymrite
Mindat Formula:
BaAl2Si2(O,OH)8 · H2O
Common Impurities:
Fe,Mn,K
Crystallography of Cymrite
Crystal System:
Monoclinic
Class (H-M):
2 - Sphenoidal
Space Group:
P21
Setting:
P21
Cell Parameters:
a = 5.329(5) Å, b = 36.6 Å, c = 7.681(22) Å
β = 90°
β = 90°
Ratio:
a:b:c = 0.146 : 1 : 0.21
Unit Cell V:
1,498.11 Ă
Âł (Calculated from Unit Cell)
Z:
8
Comment:
pseudohexagonal
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0008028 | Cymrite | Fasshauer D W, Chatterjee N D, Marler B (1997) Synthesis, structure, thermodynamic properties, and stability relations of K-cymrite, K[AlSi3O8].H2O Physics and Chemistry of Minerals 24 455-462 | 1997 | 0 | 293 | ||
0015567 | Cymrite | Drits V A, Kashaev A A, Sokolova G V (1975) Crystal structure of cymrite Soviet Physics Crystallography 20 171-175 | 1975 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
2.96 Ă | (100) |
3.96 Ă | (90) |
2.67 Ă | (70) |
7.71 Ă | (50) |
2.24 Ă | (40) |
2.21 Ă | (40) |
1.850 Ă | (40) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Near-surface Processes | |
23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47) | |
High-đ alteration and/or metamorphism | |
32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits |
Type Occurrence of Cymrite
General Appearance of Type Material:
As thin pseudohexagonal platelets and prisms, to 7 mm; also fibrous
Place of Conservation of Type Material:
The Natural History Museum, London, England, 1944,36 and 1944,48.
Geological Setting of Type Material:
veins in manganese silicates
Associated Minerals at Type Locality:
Reference:
Campbell Smith, W., Bannister, F.A., Hey, M.H. (1949) Cymrite, a new barium mineral from the Benallt manganese mine, Rhiw, Carnarvonshire. Mineralogical Magazine, 28(206),676-681.
Other Language Names for Cymrite
German:Cymrit
Japanese:ăă„ă ăȘçł
ïŸïŸçł
ïŸïŸçł
Russian:ĐĐžĐŒŃĐžŃ
Simplified Chinese:éçĄ
éĄçł
Spanish:Cymrita
Common Associates
Associated Minerals Based on Photo Data:
7 photos of Cymrite associated with Melanotekite | Pb2Fe3+2(Si2O7)O2 |
6 photos of Cymrite associated with Manganophyllite | K(Fe,Mg,Mn)3AlSi3O10(OH)2 |
5 photos of Cymrite associated with Andradite | Ca3Fe3+2(SiO4)3 |
3 photos of Cymrite associated with Calcite | CaCO3 |
2 photos of Cymrite associated with Banalsite | Na2BaAl4Si4O16 |
2 photos of Cymrite associated with Celsian | Ba(Al2Si2O8) |
1 photo of Cymrite associated with Hedyphane | Ca2Pb3(AsO4)3Cl |
1 photo of Cymrite associated with Pyrite | FeS2 |
1 photo of Cymrite associated with Albite | Na(AlSi3O8) |
1 photo of Cymrite associated with Lawsonite | CaAl2(Si2O7)(OH)2 · H2O |
Related Minerals - Strunz-mindat Grouping
9.EG.10 | Naujakasite | (Na,K)6(Fe2+,Mn2+,Ca)(Al,Fe)4Si8O26 |
9.EG.10 | Manganonaujakasite | Na6(Mn2+,Fe2+)Al4Si8O26 |
9.EG.15 | Dmisteinbergite | Ca(Al2Si2O8) |
9.EG.20 | Kampfite | Ba12(Si11Al5)O31(CO3)8Cl5 |
9.EG.25 | StrÀtlingite | Ca2Al2SiO7 · 8H2O |
9.EG.25 | Vertumnite | Ca4Al4Si4O6(OH)24 · 3H2O |
9.EG.30 | Eggletonite | (Na,K,Ca)2(Mn,Fe)8(Si,Al)12O29(OH)7 · 11H2O |
9.EG.30 | Ganophyllite | (K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O |
9.EG.30 | Tamaite | (Ca,K,Ba,Na)3-4Mn24(Si,Al)40(O,OH)112 · 21H2O |
9.EG.35 | Coombsite | KMn2+13(Si,Al)18O42(OH)14 |
9.EG.35 | Zussmanite | K(Fe,Mg,Mn)13(Si,Al)18O42(OH)14 |
9.EG.40 | Franklinphilite | (K,Na)4(Mn2+,Mg,Zn)48(Si,Al)72(O,OH)216 · 6H2O |
9.EG.40 | Lennilenapeite | K6-7(Mg,Mn,Fe,Zn)48(Si,Al)72(O,OH)216 · 16H2O |
9.EG.40 | Parsettensite | (K,Na,Ca)7.5(Mn,Mg)49Si72O168(OH)50 · nH2O |
9.EG.40 | Stilpnomelane | (K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O |
9.EG.40 | Chalcodite | K(Fe3+,Mg,Fe2+)8(Si,Al)12(O,OH)27 |
9.EG.45 | Latiumite | (Ca,K)4(Si,Al)5O11(SO4,CO3) |
9.EG.45 | Tuscanite | KCa6(Si,Al)10O22(SO4,CO3)2(OH) · H2O |
9.EG.45 | Levantite | KCa3Al2(SiO4)(Si2O7)(PO4) |
9.EG.50 | Jagoite | Pb18Fe3+4[Si4(Si,Fe3+)6][Pb4Si16(Si,Fe)4]O82Cl6 |
9.EG.55 | Wickenburgite | CaPb3Al2Si10O24(OH)6 |
9.EG.60 | Hyttsjöite | Pb18Ba2Ca5Mn2+2Fe3+2Si30O90Cl · 6H2O |
9.EG.65 | Armbrusterite | K5Na7Mn15[(Si9O22)4](OH)10 · 4H2O |
9.EG.70 | Britvinite | [Pb7(OH)3F(BO3)2(CO3)][Mg4.5(OH)3(Si5O14)] |
9.EG.70 | Roymillerite | Pb24Mg9(Si10O28)(CO3)10(BO3)(SiO4)(OH)13O5 |
9.EG.75 | Bannisterite | (Ca,K,Na)(Mn2+,Fe2+)10(Si,Al)16O38(OH)8 · nH2O |
9.EG.75 | UM1989-30-SiO:AlBaCaFeHKMgMn | (Ba,Ca)(Mn,Fe,Mg)22(Si,Al)32O76(OH)16 · 12H2O |
9.EG.75 | Kayupovaite | Na2Mn10[(Si14Al2)O38(OH)8] · 7H2O |
Fluorescence of Cymrite
Greenish white
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.
Internet Links for Cymrite
mindat.org URL:
https://www.mindat.org/min-1205.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
References for Cymrite
Reference List:
Localities for Cymrite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
â - Click for references and 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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Canada | |
| Econ Geol (1989) +1 other reference |
China | |
| Can. J. Earth Sci. 44: 479â492 (2007) |
| Shenghua Wu et al. (2010) |
| Xing et al. (2011) |
Cuba | |
| Blanco-Quintero et al. (2010) |
Czech Republic | |
| StaĆkovĂĄ |
Fojt | |
| Kuttna +1 other reference |
France | |
| Pouit et al. (1986) +1 other reference |
Greece | |
| Reinecke (1982) |
Guatemala | |
| Mikhail Ostrooumov and Alfredo Victoria Morales (2010) |
India | |
| Kaur et al. (2016) |
Iraq | |
| Mohammad et al. (2007) |
Italy | |
| Biagioni et al. (2010) +1 other reference |
Japan | |
| Takahashi (2009) |
| Matsubara et al. (1988) |
| Handbook of Mineralogy (c) |
| Masutomi Museum specimen (Kyoto) |
| Shi et al. (2012) |
| Nishio-Hamane et al. (2012) |
| Fukuoka et al. (1988) |
| Matsubara (1985) +1 other reference |
Myanmar | |
| Shi et al. (2012) |
Shi et al. (2012) | |
New Zealand | |
| Soong et al. (1975) +1 other reference |
North America | |
Brosgé (1960) | |
North Macedonia | |
| Bulletin Scientifique et al. (Zagreb) +1 other reference |
| Bermanec et al +1 other reference |
Chukanov et al. (2015) | |
JanÄev et al. (2017) | |
Romania | |
| UdubaĆa et al. (1983) +1 other reference |
| Editor:SzakĂĄll |
Russia | |
| Sorokhtina et al. (2008) |
| Sorokhtina et al. (2008) |
| Sorokhtina et al. (2008) |
| Sorokhtina et al. (2008) |
| Sorokhtina et al. (2008) |
Sorokhtina et al. (2008) | |
South Africa | |
| Cairncross et al. (1995) |
| Wilson et al. (1978) |
Spain | |
| Aye et al. (1975) |
| Moro et al. (2001) |
| Moro et al. (2001) |
Sweden | |
| Gatedal (n.d.) +1 other reference |
| Holtstam et al. (1994) |
| Nysten (2004) |
Switzerland | |
| Stalder et al. (1998) +1 other reference |
UK | |
| Coats (1980) +2 other references |
| Campbell Smith et al. (1949) +2 other references |
USA | |
| Runnells (1964) +1 other reference |
- (2008) | |
- (2008) | |
| Runnells (1964) +1 other reference |
| Shi et al. (2012) |
| Essene (1967) |
| Van Nostrand Reinholt Press: 368. +3 other references |
| Castor et al. (2004) |
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Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK