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Magnesiocarpholite

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Formula:
(Mg,Fe
2+
 
)Al
 
2
(Si
 
2
O
 
6
)(OH)
 
4
System:OrthorhombicHardness:5 - 5½
Member of:Carpholite Group

Classification of Magnesiocarpholite

IMA status:Approved
Strunz 8th edition ID:8/F.03-10
Nickel-Strunz 10th (pending) edition ID:9.DB.05

9 : SILICATES (Germanates)
D : Inosilicates
B : Inosilicates with 2-periodic single chains, Si2O6; Pyroxene-related minerals
Dana 8th edition ID:65.1.5.3

65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
1 : Single-Width Unbranched Chains, W=1 with chains P=2
Hey's CIM Ref.:16.19.12

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

Type Locality:Vanoise, Savoie, Rhône-Alpes, France
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°
Maximum Birefringence:δ = 0.020

Chart 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,Fe
2+
 
)Al
 
2
(Si
 
2
O
 
6
)(OH)
 
4
Simplified for copy/paste:(Mg,Fe2+)Al2(Si2O6)(OH)4
Essential elements:Al, H, Mg, O, Si
All elements listed in formula:Al, Fe, H, Mg, O, Si
Common Impurities:Ti,Fe,Mn,Ca,Na,K,H2O,P

Relationship of Magnesiocarpholite to other Species

Series:Forms a series with Ferrocarpholite (see here)
Member of:Carpholite Group
Other Members of Group:

- +
Carpholite
Mn
2+
 
Al
 
2
(Si
 
2
O
 
6
)(OH)
 
4
Ferrocarpholite
(Fe
2+
 
,Mg)Al
 
2
(Si
 
2
O
 
6
)(OH)
 
4
Potassiccarpholite
(K,☐)(Li,Mn
2+
 
)
 
2
Al
 
4
(Si
 
2
O
 
6
)
 
2
(OH,F)
 
8
Vanadiocarpholite
Mn
2+
 
V
3+
 
Al(Si
 
2
O
 
6
)(OH)
 
4
Related Minerals - Nickel-Strunz Grouping):

- +
9.DB.05Balipholite
BaLiMg
 
2
Al
 
3
(Si
 
2
O
 
6
)
 
2
(OH)
 
4
9.DB.05Carpholite
Mn
2+
 
Al
 
2
(Si
 
2
O
 
6
)(OH)
 
4
9.DB.05Ferrocarpholite
(Fe
2+
 
,Mg)Al
 
2
(Si
 
2
O
 
6
)(OH)
 
4
9.DB.05Potassiccarpholite
(K,☐)(Li,Mn
2+
 
)
 
2
Al
 
4
(Si
 
2
O
 
6
)
 
2
(OH,F)
 
8
9.DB.05Vanadiocarpholite
Mn
2+
 
V
3+
 
Al(Si
 
2
O
 
6
)(OH)
 
4
9.DB.10Lorenzenite
Na
 
2
Ti
 
2
(Si
 
2
O
 
6
)O
 
3
9.DB.15Lintisite
LiNa
 
3
Ti
 
2
(Si
 
2
O
 
6
)
 
2
O
 
2
· 2H
 
2
O
9.DB.15Punkaruaivite
LiTi
 
2
(HSi
 
4
O
 
12
)(OH)
 
2
· H
 
2
O
9.DB.17Eliseevite
LiNa
 
1.5
Ti
 
2
(H
 
1.5
Si
 
4
O
 
12
)O
 
2
· 2H
 
2
O
9.DB.20Kukisvumite
Na
 
6
ZnTi
 
4
(Si
 
8
O
 
24
)O
 
4
· 4H
 
2
O
9.DB.20Manganokukisvumite
Na
 
6
MnTi
 
4
(Si
 
8
O
 
24
)O
 
4
· 4H
 
2
O
9.DB.25Vinogradovite
(Na,Ca,K)
 
4
Ti
 
4
AlSi
 
6
O
 
23
(OH) · 2H
 
2
O
9.DB.25Paravinogradovite
Na
 
1-2
(Ti,Fe
3+
 
)
 
4
(Si
 
2
O
 
6
)
 
2
(AlSi
 
3
O
 
10
)(OH)
 
4
· H
 
2
O
9.DB.30Nchwaningite
Mn
2+
2
(SiO
 
3
)(OH)
 
2
· H
 
2
O
9.DB.35Plancheite
Cu
 
8
(Si
 
8
O
 
22
)(OH)
 
4
· H
 
2
O
9.DB.40Shattuckite
Cu
 
5
(Si
 
2
O
 
6
)
 
2
(OH)
 
2
9.DB.40UM2005-31-SiO:CuH
Cu
 
11
(SiO
 
4
)(OH)
 
18
· 9H
 
2
O ?
9.DB.45Aerinite
(Ca
 
5.1
Na
 
0.5
)(Fe
3+
 
,Al,Fe
2+
 
,Mg)
 
4
(Al,Mg)
 
6
[HSi
 
12
O
 
36
(OH)
 
12
][(CO
 
3
)
 
1.2
(H
 
2
O)
 
12
]
9.DB.50Capranicaite
KCaNaAl
 
4
B
 
4
Si
 
2
O
 
18
Related Minerals - Hey's Index Grouping:

- +
16.19.1Indialite
Mg
 
2
Al
 
3
(AlSi
 
5
O
 
18
)
16.19.2Cordierite
(Mg,Fe)
 
2
Al
 
3
(AlSi
 
5
O
 
18
)
16.19.3Sekaninaite
(Fe,Mg)
 
2
Al
 
3
(AlSi
 
5
O
 
18
)
16.19.4Ferro-gedrite
☐{Fe
2+
2
}{Fe
2+
3
Al
 
2
}(Al
 
2
Si
 
6
O
 
22
)(OH)
 
2
16.19.5Staurolite
(Fe
2+
 
,Mg,Zn)
 
1.5-2
Al
 
9
(SiO
 
4
)
 
4
O
 
6
(OH,O)
 
2
16.19.6Chloritoid
(Fe
2+
 
,Mg,Mn
2+
 
)Al
 
2
(SiO
 
4
)O(OH)
 
2
16.19.7Amesite
Mg
 
2
Al(AlSiO
 
5
)(OH)
 
4
16.19.8Corundophilite
(Mg,Fe,Al)
 
6
(Si,Al)
 
4
O
 
10
(OH)
 
8
16.19.9Yoderite
Mg(Al,Fe
3+
 
)
 
3
(SiO
 
4
)
 
2
O(OH)
16.19.10Delessite
(Mg,Fe,Fe,Al)(Si,Al)
 
4
O
 
10
(O,OH)
 
8
16.19.11Ferrocarpholite
(Fe
2+
 
,Mg)Al
 
2
(Si
 
2
O
 
6
)(OH)
 
4
16.19.13Chamosite
(Fe
2+
 
,Mg)
 
5
Al(AlSi
 
3
O
 
10
)(OH)
 
8
16.19.14Orthochamosite
(Fe
2+
 
,Mg,Fe
3+
 
)
 
5
Al(AlSi
 
3
O
 
10
)(OH,O)
 
8
16.19.15Berthierine
(Fe
2+
 
,Fe
3+
 
,AlMg)
 
2-3
((Si,Al)
 
2
O
 
5
)(OH)
 
4
16.19.16Odinite
(Fe,Mg,Al,Fe,Ti,Mn)
 
2.4
((Si,Al)
 
2
O
 
5
)(OH)
 
4
16.19.17Clinochlore
(Mg,Fe
2+
 
)
 
5
Al(AlSi
 
3
O
 
10
)(OH)
 
8
16.19.18Gedrite
☐{Mg
 
2
}{Mg
 
3
Al
 
2
}(Al
 
2
Si
 
6
O
 
22
)(OH)
 
2
16.19.19Magnesiogedrite
16.19.20Diabantite
(Mg,Fe,Al)
 
6
((Si,Al)
 
4
O
 
10
)(OH)
 
8
16.19.21Sudoite
(Mg,Fe
2+
 
)
 
2
Al
 
3
(AlSi
 
3
O
 
10
)(OH)
 
8
16.19.22Vermiculite
(Mg,Fe,Al)
 
3
((Al,Si)
 
4
O
 
10
)(OH)
 
2
· 4H
 
2
O
16.19.23Corrensite
(Mg,Fe)
 
9
((Si,Al)
 
8
O
 
20
)(OH)
 
10
· nH
 
2
O

Other Names for Magnesiocarpholite

Synonyms:
IMA1978-027
Other Languages:
German:Magnesiocarpholit
Russian:Магнезиокарфолит
Spanish:Magnesiocarpholita

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 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

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Magnesiocarpholite details from Handbook of Mineralogy (PDF)
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  • Localities for Magnesiocarpholite

    (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.
    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.
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