232 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 58 



MINERALOGY (Continued) 



1637. RAMMELSBERG, C. Ueber die chemische Zusammensetzung des Zinn- 



kieses. 



Ann. Physik. Chem., Vol. 88, 18-53, Leipzig, pp. 603-608. 



Digest: Neues Jahrb. Min., 1855, Stuttgart, pp. 72-73. 



Gives a number of analyses of stannite from Zinnwald and Cornwall. 



1638. REID, CLEMENT, and SCRIVENOR, J. B. The geology of the country near 



Newquay. 



Mem. Geol. Surv. Great Britain, 1906, London, p. 39. 



The so-called pseudomorphs of cassiterile after feldspar are really a replacement of 

 that mineral by an aggregation of cassiterite, quartz and muscovite. 



1639. ROSENBUSCH, H. Microscopical physiography of the rock-making min- 



erals. 



Translation and abridgement by Jos. P. Iddings, 1889, New York, pp. 151-152. 



Microscopical -optical properties. Only one unquestioned occurrence noted of cas- 

 siterite occurring as a microscopical rock-making mineral, where it occurs with 

 rutile as inclusions in the lithia-mica of the granite of Greifenstein. 



SCHERTEL, A., and STELZNER, A. W. See No. 1643. 

 SCBIVENOR, J. B., and REID, CLEMENT. See No. 1638. 



1640. SOLLY, R. H. Cassiterite, " sparable tin," from Cornwall. 



Mg. Mag., Vol. 9, No. 43, 1891, New York, pp. 199-208, figs. 3. 

 Brief digest: Neues Jahrb. Min., 1892, II (Min.), Stuttgart, p. 15. 

 Descriptions of the tin crystals of various mines of Cornwall. 



1641. SPENCER, L. J. Crystallized stannite from Bolivia. 



Min. Mag. Journ. Min. Soc., Vol. 13, 1901, London, pp. 54-65, pi. 1. Read Novem- 

 ber 14, 1899. 



Reprint: Zeitschr. Kryst. Min., Vol. 35, 1902, Leipzig, pp. 468-469, pi. 12, figs. 3-7. 



Reviews the literature upon the crystallization of stannite, and shows from measure- 

 ment of specimens from Bolivia that the mineral crystallizes in the scalcnohedral- 

 tetragonal system. Crystals 1-1.5 mm. across and had the composition Cu_FeSnS 4 . 



Reviews specimens from Oruro, Potosi, and Tatasi, Bolivia, and from Cornwall. 



1642. STELZNER, A. W. Ueber Franckeit, ein neues Erz aus Bolivia. 



Neues Jahrb. Min., 1893, II, Stuttgart, pp. 114-124. 

 Composition, Pb B FeSn 3 Sb 2 S 14 . 



1643. STELZNER, A. W., and SCHERTEL, A. Ueber den Zinngehalt und iiber 



die chemische Zusammeusetzung der schwarzen Zinkblende von Frei- 

 berg. 



Jahrb. Berg. Hlitt. K6n. Sachsen, 1886, Freiberg, pp. 52-70, pi. of figs. 1. 



1644. THIBAULT, P. J. Conradite. A new mineral compound of tin. 



Austr. Mg. Stand., Vol. 33, 1905, Sydney and Melbourne, pp. 124-125. 



Discovered by author at the Conrad Mines, Howell, New South Wales, in 1902. 

 Composition, 7SnO2+Fe 2 O 3 , being a compound of stannic and ferric oxides containing: 

 Tin, 68.44 per cent, iron 9.2 per cent, oxygen 22.32 per cent. Absolutely insoluble 

 in nitric, hydrochloric, sulphuric and hydrofluoric acids and aqua regia. Specific 

 gravity about 6.2; not attracted by the magnet. 



1645. TRECHMANN, C. O. On a probably dimorphous form of tin; and on some 



crystals found associated with it. 



Min. Mag. Journ. Min. Soc., Vol. 3, 1879, London, pp. 186-192. 



Two forms of crystals apparently obtained by electrolytic and d'r> methods of 

 manufacture of metallic tin crystals. 



