Sapphirine-1A
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Formula:
(Mg,Al,Fe2+)8[(Al,Si,Fe3+)6O18]O2
Lustre:
Vitreous
Crystal System:
Triclinic
Unique Identifiers
Mindat ID:
3530
Long-form identifier:
mindat:1:1:3530:5
Classification of Sapphirine-1A
16.7.3
16 : Silicates Containing Aluminum and other Metals
7 : Aluminosilicates of Mg
16 : Silicates Containing Aluminum and other Metals
7 : Aluminosilicates of Mg
Physical Properties of Sapphirine-1A
Chemistry of Sapphirine-1A
Mindat Formula:
(Mg,Al,Fe2+)8[(Al,Si,Fe3+)6O18]O2
Element Weights:
Crystallography of Sapphirine-1A
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°
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-1A
Other Language Names for Sapphirine-1A
Russian:Сапфирин-1Tc
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 Sapphirine-1A
mindat.org URL:
https://www.mindat.org/min-3530.html
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References for Sapphirine-1A
Reference List:
McKie, Duncan (1963) Order-disorder in sapphirine. Mineralogical Magazine and Journal of the Mineralogical Society, 33 (263) 635-645 doi:10.1180/minmag.1963.033.263.02
Merlino, Stefano (1973) Polymorphism in sapphirine. Contributions to Mineralogy and Petrology, 41 (1) 23-29 doi:10.1007/bf00377649[Abstract in American Mineralogist (1974): 59: 632]
Merlino, Stefano (1980) Crystal structure of sapphirine-lTc. Zeitschrift für Kristallographie, 151 (1-2). 91-100 doi:10.1524/zkri.1980.151.1-2.91
Christy, Andrew G., Putnis, Andrew (1988) Planar and line defects in the sapphirine polytypes. Physics and Chemistry of Minerals, 15 (6) 548-558 doi:10.1007/bf00311025(Abstract in American Mineralogist (1990): 75: 937.)
Christy, Andrew G. (1989) The effect of composition, temperature and pressure on the stability of the 1Tc and 2M polytypes of sapphirine. Contributions to Mineralogy and Petrology, 103 (2) 203-215 doi:10.1007/bf00378506
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 (8) 1104-1112 doi:10.2138/am-2002-8-907
