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Sapphirine-1A

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Formula:
(Mg,Al,Fe
2+
 
)
 
8
[(Al,Si,Fe
3+
 
)
 
6
O
 
18
]O
 
2
System:Triclinic
A polytype of Sapphirine

1-layer triclinic polytype, less common in nature than the 2M polytype.

Classification of Sapphirine-1A

IMA status:Not Approved
Explanation of status:Polytype, not a distinct species
Hey's CIM Ref.:16.7.3

16 : Silicates Containing Aluminum and other Metals
7 : Aluminosilicates of Mg
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Physical Properties of Sapphirine-1A

Lustre:Vitreous
Comment:similar range to Sapphirine-2M
Tenacity:Brittle

Crystallography of Sapphirine-1A

Crystal System:Triclinic
Class (H-M):1 - Pinacoidal
Space Group:P1
Cell Parameters:a = 10.04Å, b = 10.38Å, c = 8.65Å
α = 107.6°, β = 95.1°, γ = 123.9°
Ratio:a:b:c = 0.967 : 1 : 0.833
Unit Cell Volume:V 674.36 ų (Calculated from Unit Cell)
Z:2
Twinning:repeated lamellar twinning on (0-11), which is equivalent to (010) of the monoclinic polytypes.
Comment:Merlino (1980)

Chemical Properties of Sapphirine-1A

Formula:
(Mg,Al,Fe
2+
 
)
 
8
[(Al,Si,Fe
3+
 
)
 
6
O
 
18
]O
 
2
Essential elements:Al, Mg, O
All elements listed in formula:Al, Fe, Mg, O, Si
Analytical Data:Stabilised relative to the 2M structure by lower Fe2+, higher Fe3+, lower Be, lower temperature and/or higher pressure. Christy (1989), Christy et al. (2002).
Relationship of Sapphirine-1A to other Species
Related Minerals - Hey's Index Grouping:

- + 
16.7.1Pyrope
Mg
 
3
Al
 
2
(SiO
 
4
)
 
3
16.7.2Sapphirine
(Mg,Fe)
 
4-x
Al
 
4+x
[Al
 
4+x
Si
 
2-x
O
 
18
]O
 
2
16.7.4Magnesiochloritoid
MgAl
 
2
(SiO
 
4
)O(OH)
 
2
16.7.5Kulkeite
Mg
 
8
Al(AlSi
 
7
O
 
20
)(OH)
 
10
16.7.6Palygorskite
(Mg,Al)
 
5
(Si,Al)
 
8
O
 
20
(OH)
 
2
 · 8H
 
2
O
16.7.7Saponite
Ca
 
0.25
(Mg,Fe)
 
3
((Si,Al)
 
4
O
 
10
)(OH)
 
2
 · nH
 
2
O
16.7.8Aliettite
Ca
 
0.2
Mg
 
6
((Si,Al)
 
8
O
 
20
)(OH)
 
4
 · 4H
 
2
O
16.7.9Montmorillonite
(Na,Ca)
 
0.33
(Al,Mg)
 
2
(Si
 
4
O
 
10
)(OH)
 
2
 · nH
 
2
O
16.7.10Baumite
(Mg,Al,Mn,Zn,Fe)
 
3
(Si,Al)
 
2
O
 
5
(OH)
 
4
Other Names for Sapphirine-1A
Synonyms:
Sapphirine-1Tc
Other Languages:
Russian:Сапфирин-1Tc
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 Sapphirine-1A
Reference List:

- + 
McKie, D. (1963) Order-disorder in sapphirine. Mineralogical Magazine: 635-645.



Merlino, S. (1973) Polymorphism in sapphirine. Contribs Mineral Petrol: 41: 21-29. Abstract in American Mineralogist (1974): 59: 632.



Merlino, S. (1980) The crystal structure of sapphirine-1Tc. Zeitschrift für Kristallographie: 151: 91-100.



Christy, A.G. and Putnis, A. (1988) Planar and line defects in the sapphirine polytypes. Phys Chem Minerals: 15: 548-558. Abstract in American Mineralogist (1990): 75: 937.



Christy, A.G. (1989) The effect of composition, pressure and temperature on the stability of the 1Tc and 2M polytypes of sapphirine. Contribs Mineral Petrol 103: 203-215.



Christy, A.G., Tabira, Y., Hölscher, A., Grew, E.S., Schreyer, W. (2002) Synthesis of beryllian sapphirine in the system MgO-BeO-Al2O3-SiO2-H2O and comparison with naturally occurring beryllian sapphirine and khmaralite, Part 1: experiments, TEM and XRD. American Mineralogist: 87: 1104-1112.
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    Locality Updated: Baueddu Mine, Fluminimaggiore, Carbonia-Iglesias Province, Sardinia, ItalyFrom Uwe Kolitsch, 12th Feb 2012 20:01:38