Mineral Structure Data
The amphibole group is composed of minerals of the general formula
The crystal structure of amphibole.
End-Member Anthophyllite Gedrite Formula (Mg5.53Fe1.47)(Na.5Ca.03)Si8O22(OH)2 (Fe 1.1Mg4.5Al1.2) (Al1.8Si6.3)O22(OH,F)2 |
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End-Member Anthophyllite Gedrite Site M1 M2 M3 M4 M1 M2 M3 M4 C.N. 6 6 6 7 6 6 6 6 Occupant Mg.96Fe.04 Mg.9 7Fe.03 Mg.97Fe.03 Mg.35Fe.65 Mg.88Fe.12 Mg.4Al.6 Mg .9Fe.1 Mg.55Fe.45 Point Sym. 1 1 m 1 1 1 m 1 Wyckoff Not. 8d 8d 4c 8d 8d 8d 4c 8d Frac.Coord. x .12489 .12488 .12579 .12371 .1244 .1248 .1249 .1189 y .16329 .07317 1/4 -.00982 .1611 .0731 1/4 -.0145 z .3911 -.1099 -.1089 .3877 .3737 -.1281 -.1248 .3636 Distances Mean 2.084 2.076 2.070 2.349 2.093 1.987 2.059 2.185 sigma .032 .049 .011 .374 .042 .042 .035 .138 Poly.Vol. 11.877 11.765 11.595 17.281 11.923 10.379 11.274 12.766 Q.E. 1.0107 1.0094 1.0138 -- 1.0171 1.0058 1.0222 1.0622 Ang.Var. 34.7 30.8 44.8 -- 54.3 18.6 70.8 202.3 Site Energy -1053. -1201. -1044. -1071. -1027. -1906. -1054. -1059. Model Charge 2.0 2.0 2.0 2.0 2.0 2.6 2.0 2.0 |
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End-Member Anthophyllite Gedrite Site T1A T1B T2A T2B T1A T1B T2A T2B C.N. 4 4 4 4 4 4 4 4 Occupant Si Si Si Si Si.66Al.34 Si.62Al.38 Si Si.84Al.16 Point Sym. 1 1 1 1 1 1 1 1 Wyckoff Not. 8d 8d 8d 8d 8d 8d 8d 8d Frac.Coord. x .23039 .01863 .22731 .02469 .2315 .0202 .2278 .0266 y -.1654 -.16626 -.07956 -.08177 -.1631 -.1645 -.0760 -.0802 z -.4334 .2760 .0622 -.2227 -.4487 .2971 .0502 -.1985 Distances Mean 1.620 1.622 1.624 1.633 1.650 1.656 1.616 1.649 sigma .013 .011 .023 .020 .017 .009 .026 .017 Poly.Vol. 2.183 2.189 2.175 2.221 2.306 2.331 2.140 2.286 Q.E. 1.0002 1.0001 1.0076 1.0046 1.0006 1.0001 1.0087 1.0041 Ang.Var. 0.9 0.3 30.5 18.4 2.3 0.7 33.4 15.5 Site Energy -4433. -4403. -4425. -4393. -3769. -3701. -4405. -4062. Model Charge 4.0 4.0 4.0 4.0 3.66 3.62 4.00 3.84 |
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