Introduction
Berthierine is an iron-rich, aluminous, 1:1-type layer silicate belonging to the serpentine group (Bailey, 1980; Brindley, 1980, 1981). The name honors Berthier, who reported the first studies of this mineral in 1827. In the past, this clay mineral was also known as septechlorite, septechamosite, chamosite, 7Ã¥-chamosite, and 7Ã¥-chlorite, but berthierine is now the accepted name (Brindley et al., 1968). Berthierine was considered rare until recently. The failure to recognize berthierine arose mostly from its chemical similarity to Fe-rich chlorite (chamosite); these phases share many significant X-ray powder diffraction (XRD) lines. The ease with which berthierine can be mistaken for kaolinite in XRD patterns of oriented crystal aggregates has also contributed to its misidentification (Moore and Reynolds, 1997, p. 139).
Berthierine is chemically and structurally similar to odinite. However, odinite is now formally recognized as a distinct 0.7 nm phase (Bailey, 1988a), and...
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Longstaffe, F.J. (1978). Berthierine. In: Middleton, G.V., Church, M.J., Coniglio, M., Hardie, L.A., Longstaffe, F.J. (eds) Encyclopedia of Sediments and Sedimentary Rocks. Encyclopedia of Earth Sciences Series. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-3609-5_26
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