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Magnesiocarpholite

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Formula:
(Mg,Fe2+)Al2(Si2O6)(OH)4
System:
Orthorhombic
Hardness:
5 - 5½

Classification of Magnesiocarpholite

Approved
9.DB.05

9 : SILICATES (Germanates)
D : Inosilicates
B : Inosilicates with 2-periodic single chains, Si2O6; Pyroxene-related minerals
65.1.5.3

65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
1 : Single-Width Unbranched Chains, W=1 with chains P=2
16.19.12

16 : Silicates Containing Aluminum and other Metals
19 : Aluminosilicates of Fe and Mg
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First Recorded Occurrence of Magnesiocarpholite

Year of Discovery:
1977

Physical Properties of Magnesiocarpholite

Hardness (Mohs):
5 - 5½

Crystallography of Magnesiocarpholite

Crystal System:
Orthorhombic
Cell Parameters:
a = 13.71Å, b = 20.07Å, c = 5.1Å
Ratio:
a:b:c = 0.683 : 1 : 0.254
Unit Cell Volume:
V 1,403.31 ų (Calculated from Unit Cell)

Optical Data of Magnesiocarpholite

Type:
Biaxial (-)
RI values:
nα = 1.590 nβ = 1.600 nγ = 1.610
2V:
Measured: 50° to 60°, Calculated: 88°
Max Birefringence:
δ = 0.020
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v distinct

Chemical Properties of Magnesiocarpholite

Formula:
(Mg,Fe2+)Al2(Si2O6)(OH)4
Essential elements:
All elements listed in formula:
Common Impurities:
Ti,Fe,Mn,Ca,Na,K,H2O,P

Relationship of Magnesiocarpholite to other Species

Series:
Forms a series with Ferrocarpholite (see here)
Other Members of Group:
CarpholiteMn2+Al2(Si2O6)(OH)4
Ferrocarpholite(Fe2+,Mg)Al2(Si2O6)(OH)4
Potassiccarpholite(K,☐)(Li,Mn2+)2Al4(Si2O6)2(OH,F)8
VanadiocarpholiteMn2+V3+Al(Si2O6)(OH)4
9.DB.05BalipholiteBaLiMg2Al3(Si2O6)2(OH)4
9.DB.05CarpholiteMn2+Al2(Si2O6)(OH)4
9.DB.05Ferrocarpholite(Fe2+,Mg)Al2(Si2O6)(OH)4
9.DB.05Potassiccarpholite(K,☐)(Li,Mn2+)2Al4(Si2O6)2(OH,F)8
9.DB.05VanadiocarpholiteMn2+V3+Al(Si2O6)(OH)4
9.DB.10LorenzeniteNa2Ti2(Si2O6)O3
9.DB.15LintisiteLiNa3Ti2(Si2O6)2O2 · 2H2O
9.DB.15PunkaruaiviteLiTi2(HSi4O12)(OH)2 · H2O
9.DB.17EliseeviteLiNa1.5Ti2(H1.5Si4O12)O2 · 2H2O
9.DB.20KukisvumiteNa6ZnTi4(Si8O24)O4 · 4H2O
9.DB.20ManganokukisvumiteNa6MnTi4(Si8O24)O4 · 4H2O
9.DB.25Vinogradovite(Na,Ca,K)4Ti4AlSi6O23(OH) · 2H2O
9.DB.25ParavinogradoviteNa1-2(Ti,Fe3+)4(Si2O6)2(AlSi3O10)(OH)4 · H2O
9.DB.30NchwaningiteMn22+(SiO3)(OH)2 · H2O
9.DB.35PlancheiteCu8(Si8O22)(OH)4 · H2O
9.DB.40ShattuckiteCu5(Si2O6)2(OH)2
9.DB.40UM2005-31-SiO:CuHCu11(SiO4)(OH)18 · 9H2O ?
9.DB.45Aerinite(Ca5.1Na0.5)(Fe3+,Al,Fe2+,Mg)4(Al,Mg)6[HSi12O36(OH)12][(CO3)1.2(H2O)12]
9.DB.50CapranicaiteKCaNaAl4B4Si2O18
16.19.1IndialiteMg2Al3(AlSi5O18)
16.19.2Cordierite(Mg,Fe)2Al3(AlSi5O18)
16.19.3Sekaninaite(Fe,Mg)2Al3(AlSi5O18)
16.19.4Ferro-gedrite☐{Fe22+}{Fe32+Al2}(Al2Si6O22)(OH)2
16.19.5Staurolite(Fe2+,Mg,Zn)1.5-2Al9(SiO4)4O6(OH,O)2
16.19.6Chloritoid(Fe2+,Mg,Mn2+)Al2(SiO4)O(OH)2
16.19.7AmesiteMg2Al(AlSiO5)(OH)4
16.19.8Corundophilite(Mg,Fe,Al)6(Si,Al)4O10(OH)8
16.19.9YoderiteMg(Al,Fe3+)3(SiO4)2O(OH)
16.19.10Delessite(Mg,Fe,Fe,Al)(Si,Al)4O10(O,OH)8
16.19.11Ferrocarpholite(Fe2+,Mg)Al2(Si2O6)(OH)4
16.19.13Chamosite(Fe2+,Mg)5Al(AlSi3O10)(OH)8
16.19.14Orthochamosite(Fe2+,Mg,Fe3+)5Al(AlSi3O10)(OH,O)8
16.19.15Berthierine(Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4
16.19.16Odinite(Fe,Mg,Al,Fe,Ti,Mn)2.4((Si,Al)2O5)(OH)4
16.19.17Clinochlore(Mg,Fe2+)5Al(AlSi3O10)(OH)8
16.19.18Gedrite☐{Mg2}{Mg3Al2}(Al2Si6O22)(OH)2
16.19.19Magnesiogedrite
16.19.20Diabantite(Mg,Fe,Al)6((Si,Al)4O10)(OH)8
16.19.21Sudoite(Mg,Fe2+)2Al3(AlSi3O10)(OH)8
16.19.22Vermiculite(Mg,Fe,Al)3((Al,Si)4O10)(OH)2 · 4H2O
16.19.23Corrensite(Mg,Fe)9((Si,Al)8O20)(OH)10 · nH2O

Other Names for Magnesiocarpholite

Name in Other Languages:

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 Magnesiocarpholite

Reference List:
American Mineralogist (1981): 66: 1080-1085.

Chopin, C. and Schreyer, W. (1983) Magnesio-carpholite and magnesiochloritoid: two index minerals of pelitic blueschists and their preliminary phase relations n the model system MgO-Al2O3-SiO2-H2O. American Journal of Science: 283-A: 72-96.

Comptes rendu de l’Académie des sciences de Paris: 277: 1965-1968.

Bulletin de la Société française de Minéralogie et de Cristallographie (1980): 103: 299.

Mineralogical Magazine (1992): 56: 835-838.

Vidal, O., Goffé, B., and Theye, T. (1992) Experimental study of the stability of sudoite and magnesiocarpholite and calculation of a new petrogenic grid for the system FeO-MgO-Al2O3-SiO2-H2O. Journal of Metamorphic Geology: 10: 603-614.

Bertoldi, C., Dachs, E., Theye, T., Cemič, L., Behrens, H., and Amthauer, G. (2004b) Heat capacities of natural magnesio- and ferrocarpholite. European Journal of Mineralogy, Berichte der Deutschen Mineralogischen Gesellschaft, Beiheft No 1, 16, 14.

Bertoldi, C., Dachs, E., and Theye, T. (2006) Calorimetric data for naturally occurring magnesiocarpholite and ferrocarpholite. American Mineralogist: 91: 441-445.

Internet Links for Magnesiocarpholite

Localities for Magnesiocarpholite

(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.
France
 
  • Rhône-Alpes
    • Savoie
Compt. Rendus Acad. Sci. Paris, 277, 1965-1968; Contr. Min. Pet. 76 (1981), 260
Germany
 
  • Saxony-Anhalt
    • Harz
Lapis 15(7/8), 59-60 (1990)
Greece
 
  • Crete Department (Kriti)
    • Crete Island (Kriti)
      • Chania Prefecture (Khania; Chaníon)
        • Kissamos
Viswanathan, K., & Seidel, E. (1979). Crystal chemistry of Fe-Mg-carpholites. Contributions to Mineralogy and Petrology, 70(1), 41-47.
Eur. J. Mineral. , 1992, 4, pp. 487-507.
      • Heraklion Prefecture (Iraklion)
        • Heraklion (Iraklion)
Eur. J. Mineral. , 1992, 4, pp. 487-507.
      • Rethymnon Prefecture
Viswanathan, K., & Seidel, E. (1979). Crystal chemistry of Fe-Mg-carpholites. Contributions to Mineralogy and Petrology, 70(1), 41-47.
  • Peloponnese Department (Peloponnisos)
    • Lakonia Prefecture (Laconia)
Eur. J. Mineral. , 1992, 4, pp. 487-507.
Eur. J. Mineral. , 1992, 4, pp. 487-507.
Italy
 
  • Piedmont
    • Cuneo Province
      • Corsaglia Valley
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.
      • Grana Valley
        • Castelmagno
Piccoli, G.C. (2002): I minerali delle Alpi Marittime e Cozie. Provincia di Cuneo. Associazione Amici del Museo "F. Eusebio" di Alba, Ed., Alba, 362 pp.
      • Maira Valley
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, 607 pag.
  • Tuscany
    • Grosseto Province
Eur. J. Mineral., 9, 859-873
Fuchs, Mellini, and Memmi (2001) Crystal-chemistry of magnesiocarpholite Eur, J. Min. 13: 533-543
Spain
 
  • Andalusia
    • Almería
      • Sierra Alhamilla
        • Tabernas
B. Goffé et al. , Eur. J. Mineral. , 1996, 8, pp. 335-348.
    • Granada
Eur. J. Mineral. , 1989, 1, pp. 139-142..
      • Salobreña
B. Goffé et al. , Eur. J. Mineral. , 1996, 8, pp. 335-348.
J.M. Azanon and B. Goffé, Eur. J. Mineral., 1997, 9, pp. 1035-1051.
Switzerland
 
  • Grischun (Grisons; Graubünden)
    • Engadin
      • Martina
Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Wepf (Basel), p. 163.
Mineral and/or Locality  
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