Abstract
AGRELL1 recently found a group of new minerals occurring in ferruginous cherts metamorphosed under conditions of the glaucophane–lawsonite schist facies. This metamorphic environment is characterized by a combination of pressures near 10 kbar and temperatures in the range 200°–300° C. The partial pressure of water must be high. High-pressure phases such as jadeite, lawsonite, omphacite and aragonite are found in related rocks. Deerite, one of the new minerals, is essentially a hydrated ferrous–ferric silicate. The mineral is almost opaque to visible radiation and this property suggested that the magnetic behaviour might be of interest.
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References
Agrell, S. O., Brown, M. G., and McKie, D., Amer. Mineral., 50, 278 (1965).
Griffith, J. S., and Orgel, L. E., Quart. Rev. Chem. Soc., 11, 381 (1957).
Fyfe, W. S., Geochim. Cosmochim. Acta, 19, 141 (1960).
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CARMICHAEL, I., FYFE, W. & MACHIN, D. Low Spin Ferrous Iron in the Iron Silicate Deerite. Nature 211, 1389 (1966). https://doi.org/10.1038/2111389a0
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DOI: https://doi.org/10.1038/2111389a0
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