Chlorite Crystallography

Composition

(Mg,Fe,Al)6(Si,Al)4O10(OH)8

Classification

2:2 Phyllosilicate, Chlorite Group

Structural Parameters

a=5.327, b=9.227, c=14.356 Å
alpha=90.45, beta=97.35, gamma=89.98°
Space Group: C -1

atom

x/a

y/b

z/c
Mg1 0 0 0
Mg2 0.0015 0.3336 -0.0001
Mg3 -0.0008 0.1667 0.4999
Al1 0 0.5 0.5
Cr1 0 0.5 0.5
Si1 0.2328 0.1688 0.1920
Al1 0.2328 0.1688 0.1920
Si2 0.7332 0.0022 0.1919
Al2 0.7332 0.0022 0.1919
OH1 0.6915 0.3338 0.0727
OH2 0.1582 -0.0009 0.4305
OH3 0.1349 0.3396 0.4303
OH4 0.6351 0.1582 0.4308
O11 0.1935 0.1673 0.0769
O2 0.6938 0.0011 0.0767
O3 0.2107 0.3364 0.2333
O4 0.5151 0.1045 0.2334
O5 0.0148 0.0674 0.2330
H1 0.687 0.343 0.142
H2 0.127 0.012 0.371
H3 0.1290 0.3510 0.3670
H4 0.6080 0.1570 0.3680

Reference

Phillips, T. L., J.K. Loveless, S.W. Bailey. 1980. Cr3+ coordination in chlorites: a structural study of ten chromian chlorites. American Mineralogist 65:112-122.

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Original release: 1 Oct 1998