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Sapphirine-1A

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Formula:
(Mg,Al,Fe2+)8[(Al,Si,Fe3+)6O18]O2
Lustre:
Vitreous
Crystal System:
Triclinic
A polytype of Sapphirine

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


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Classification of Sapphirine-1AHide

16.7.3

16 : Silicates Containing Aluminum and other Metals
7 : Aluminosilicates of Mg

Physical Properties of Sapphirine-1AHide

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

Chemical Properties of Sapphirine-1AHide

Formula:
(Mg,Al,Fe2+)8[(Al,Si,Fe3+)6O18]O2

Crystallography of Sapphirine-1AHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 10.04 Å, b = 10.38 Å, c = 8.65 Å
α = 107.6°, β = 95.1°, γ = 123.9°
Ratio:
a:b:c = 0.967 : 1 : 0.833
Unit Cell 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)

Synonyms of Sapphirine-1AHide

Other Language Names for Sapphirine-1AHide

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

16.7.1PyropeMg3Al2(SiO4)3Iso.
16.7.2SapphirineMg4(Mg3Al9)O4[Si3Al9O36]Mon. 2/m : P21/b
16.7.4MagnesiochloritoidMgAl2(SiO4)O(OH)2Mon. 2/m : B2/b
16.7.5KulkeiteMg8Al(AlSi7O20)(OH)10Mon.
16.7.6Palygorskite(Mg,Al)5(Si,Al)8O20(OH)2 · 8H2OMon. 2/m : B2/m
16.7.7SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2OMon.
16.7.8AliettiteCa0.2Mg6((Si,Al)8O20)(OH)4 · 4H2OMon.
16.7.9Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2OMon. 2/m : B2/m
16.7.10Baumite(Mg,Al,Mn,Zn,Fe)3(Si,Al)2O5(OH)4

Other InformationHide

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 Sapphirine-1AHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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.

Internet Links for Sapphirine-1AHide

 
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