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The related layered minerals ganophyllite, bannisterite, and stilpnomelane1

Published online by Cambridge University Press:  14 March 2018

Marie Lindberg Smith  and
Clifford Frondel
Marie Lindberg Smith
Affiliation:
U.S. Geological Survey, Washington, D.C. and Harvard University, Cambridge, Massachusetts
Clifford Frondel
Affiliation:
U.S. Geological Survey, Washington, D.C. and Harvard University, Cambridge, Massachusetts
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Summary

Two monoclinic minerals formerly classified as ganophyllite have been differentiated on the basis of single-crystal X-ray data. True ganophyllite occurs at the Harstig mine, Pajsberg, Sweden (a, 16·60 ± 0·05 Å; b, 27·04 ± 0·08 Å; c, 50·34 ± 0·15 Å; β, 94° 10′ ± 10′; space group A 2/a), at the Benallt mine, Caernarvonshire, Wales, and in Aroostook County, Maine. Bannisterite, a new mineral, occurs at Franklin, New Jersey (a, 22·20 ± 0·07 Å; b, 16·32 ± 0·05 Å; c, 24·70 ± 0·08 Å; β, 94° 20′ ± 10′; space group A2/a) and at the Benallt mine, Wales. Both minerals have similar pseudocells: a, 5·53 Å; b, 3·3 Å; c, 25 Å; β, 94° The chemical analysis of ganophyllite from the Harstig mine, Sweden, is: SiO2, 39·67 %; Al2O3, 7·95; Fe2O3, 0·90; MnO, 35·15; CaO, 1·11; MgO, 0·20; PbO, 0·20; K2O, 2·70; Na2O, 2·18; Li2O, trace; H2O, 9·79; total, 99·85. The chemical analysis of bannisterite from Franklin Furnace, New Jersey, is: SiO2 46·20 %; Al2O3, 4·74; MnO, 23·02; FeO, 6·40; ZnO, 4·67; CaO, 1·52; MgO, 1·99; Na2O, 0·29; K2O, 1·21; H2O, 9·74; total, 99·78.

Both ganophyllite and bannisterite show a structural resemblance to stilpnome-lane from Deer Isle, Maine, in projection on selected zones. All three have a micaceous cleavage parallel to {001} in the orientations here taken. Stilpnomelane is triclinic, pseudotrigonal, and pseudomonoclinic. In the triclinic cell, a = b, 22·05 Å ± 0·06 Å; c, 17·70 ±0·06; α, 124° 49′; β, 95° 58′; γ, 120° 00′ (angles ± 5′). In the trigonal subcell, a′, 3·2 Å; c′, 36·4. Small distorted trigonal subcells for ganophyllite have a′, 3·38 Å; c′ 37·7, and for bannisterite have a′, 3·264 and c′, 37 Å.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 36 , Issue 283 , September 1968 , pp. 893 - 913
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1968

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Footnotes

1

Publication authorized by the Director, U.S. Geological Survey. Harvard University, Mineralogical Contributions No. 454.

References

Eggleton, (R. A.) and Bailey, (S. W.), 1965. The crystal structure of stilpnomelane, Pt. l, the subcell. In Clay and clay minerals, Proc. 13th Nat. Conf. 1964, pp. 49–63.Google Scholar
Foshag, (W. F.), 1936. Ganophyllite and zincian amphibole from Franklin Furnace, N.J. Amer. Min., no. 21, pp. 63–67.Google Scholar
Hamberg, (A.), 1890. Uber Ganophyllite, ein Manganzeolith von Harstigen. Geol. Fören. Förh., vol. 12, pp. 586–598.Google Scholar
Larsen, (E. S.), 1921. The microscopic determination of the nonopaque minerals. U.S. Geol. Surv. Bull., vol. 679, p. 267.Google Scholar
Larsen, (E. S.) and Shannon, (E. V.), 1922. Notes on some new rhodonite specimens from Franklin Furnace, N.J. Amer. Min., vol. 7, pp. 149–152.Google Scholar
Larsen, (E. S.) and Shannon, (E. V.), 1924. Ganophyllite from Franklin Furnace, N.J. Amer. Min., vol. 9, pp. 238–240.Google Scholar
Larsen, (E. S.) and Berman, (Harry), 1934. The microscopic determination of the nonopaque minerals. 2nd edn. U.S. Geol. Surv. Bull., no. 848.Google Scholar
Lindberg, (M. L.), 1965. Crystallography of ganophyllite. In Geological Survey Research, 1965; U.S. Geol. Surv. Prof. :Paper 525A, pp. A152-A153.Google Scholar
Palache, (C.), 1910. Contributions to the mineralogy of Franklin Furnace, N.J. Amer. Jour. Sci., ser. 4, vol. 29, pp. 177–187.Google Scholar
Palache, (C.), 1935. Minerals of Franklin and Sterling Hill, Sussex County, N.J. U.S. Geol. Surv. Prof. Paper 180, p. 114.Google Scholar
Rogers, (A. F.), 1919. An interesting occurrence of manganese minerals near San Jose, California. Amer. Jour. Sei., ser. 4, vol. 48, pp. 443–449.Google Scholar
Ross, (]M.), Takeda, (H.), and Wones, (D. R.), 1966. Mica polytypes, systematic description and identification. Science, vol. 151, pp. 191–193.CrossRefGoogle ScholarPubMed
Smith, (W. Campbell), 1948. Ganophyllite from the Benallt mine, Rhiw, Caernarvonshire. Min. Mag., vol. 28, pp. 343–352.Google Scholar
Smith, (J. V.) and Yoder, (H. S., Jr.), 1956. Experimental and theoretical studies of the mica polymorphs. Min. Mag., vol. 31, pp. 209–235.Google Scholar
Yoshimura, (T.), Shirozu, (H.), and Hirowatari, (F.), 1955. Ganophyllites from Ananai mine, Kochi prefecture and from Ozu mine, Ehime prefecture. Journ. Min. Soc. Japan, vol. 2, pp. 108–114.Google Scholar