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Contributions to the Study of Pyrargyrite and Proustite

Published online by Cambridge University Press:  14 March 2018

H. A. Miers
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Extract

The labour of tracing the history of the Red Silver Ores, of collating the literature, and of tabulating the crystalline forms previously observed, has been, to a large extent, rendered unnecessary by the memoir published by E. Rethwisch (Neues Jahrbuch für Mineraloqie, Beilage Band iv. (1886), pp. 31-109), under the title "Beiträge zur mineralogischen und chemischen Kenntniss des Rothgültigerzes."

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 8 , Issue 37 , October 1888 , pp. 37 - 102
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1888

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References

page 39 note 1 Edinburgh Journal of Science (1825), Vol. II. p. 91.

page 40 note 1 Schuster does not seem to have been aware that this twinning had been previously described and figured by Naumann (Lehrb. der Kryst. 1830, Vol. II. p. 311, Fig. 721).

page 41 note 1 The locality of the pure Proustite mentioned on p. 201 should be Mexico, not Chañarcillo.

page 41 note 2 I am indebted to Dr. Goldschmidt for the loan of this part of the Index before its publication.

page 44 note 1 Pyrargyrite is a little harder than Proustite.

page 48 note 1 They were all tested for arsenic by the Fresenius-Babo method.

page 55 note 1 Mr. T. Davies, who had occasion in company with the late Mr. Ludlam to compare numerous specimens in this collection with Lévy's descriptions, tells me tllat the latter were also found to be very inaccurate in other species, notably topaz and diamond.

page 56 note 1 Mineralogy, 1823, p. 292.

page 57 note 1 Lehrb. der Mineralogie, lS28, p. 602, fig. 181.

page 57 note 2 Lehrb. der reinen u. angewandten Krystallographie, 1830, Vol. II. p, 312, fig. 718.

page 58 note 1 Journal d'histoire Naturelle, XVIII. p. 216.

page 58 note 2 Vol. III. p. 402.

page 69 note 1 Prof. Groth has subsequently informed me that this face was not observed by him, and tbat in line 9, p. 64, η = ⅝R3 should be η = ?⅝R3 (which is near to y = ½R⅓ if the sign be disregarded).

page 72 note 1 Fig. 2 suggests that the zone b1VBe3 must belong to what is generally the unattached end.

page 75 note 1 of. Des Cloizeaux, Manuel de Minéralogie, II. p. 109.

page 75 note 2 cf. Max Schuster, loc. cit.

page 76 note 1 Conclusive evidence will be found below.

page 76 note 2 These lamellæ may have given rise to the statement that the prism faces are striated parallel to the face g. (Rethwisch, loc. cit. p. 80.)

page 79 note 1 Loc. cit. p. 131.

page 80 note 1 cf. Schuster, p. 132.

page 80 note 2 Ber. Akad. Berlin, 1883, p. 421.

page 82 note 1 Zones rich in faces are striated when the faces tend to make re-entrant angles, curved when they form salient angles.

page 82 note 2 Hintze, Zeitsch. f. Kryst. XI. p. 234.

page 83 note 1 Care is taken to repeat the measurements at various angles of incidence, so that the reflections which correspond to true planes can be selected.

page 83 note 2 Il Nuovo Cimento IV. 1856, p. 103.

page 97 note 1 Two edges yielded accurate measurements vv = 35°13' and nn = 17°'37. The first leads to ee =42°15', the second to 41°19'.