Dec, 1908. 



MlNERALOGICAL NOTES 



145 



Combined with the pyramids are two scalenohedrons, one of which 

 has the symbol 20. 11. 31. 11 ( + ,», R ?J) and the other occurs be- 

 tween this form and a. Although the latter is a well-defined plane 

 no satisfactory reflections could be obtained from it for determining 

 its symbol. Inasmuch, however, as its zonal relations are plainly 

 shown on the crystal, it is represented in the drawing, Fig. 1, PI. XLIX. 

 The form ao.xi.3x.xi is new to calcite, and through the kindly 

 advice of Dr. Charles Palache, the letter ft : was adopted for it. The 

 form is so close to the common scalenohedron v (2i3i) that it would 

 seem probable that the latter symbol was the correct one, but the 

 measurements obtained allow no' other conclusion than the symbol 

 above chosen. 



The following are some of the measurements obtained: 



Observed Calculated 

 « A «' = (4483) A (38I 3 ) 



a A « v = (44S3) A (8333) 



r a r' = (8. 8. 16. 3) a (8. 16. 8. 3) 

 r a r v = (8. 8. T6. 3) a (16. 8. 8. 3) 

 X A r - (8. 8. 16. 3) a (01TT) 



a A * = (4483) A (1123) 



*W *"' - (n2 3 ) A (IT23) 



« A r = (4483) A (ioli) 



a v A r - (84?3) A (10T1) 



!>■: /\ !>:' (20. 11. 31. 11) a (2D. 31. IT. 11) 



ft: a ,"-: v (20. 11. 3T. 11) a (31. IT. 20. 11) 



EPSOMITE 

 WILCOX STATION, WYOMING 



Crystals of epsomite from the above locality were described by 

 one of the authors in a previous publication.* It may be here noted 

 that the figure there given should be turned at right angles to its 

 position in the text in order to be correctly placed. Some time 

 afterwards the late Prof. W. C. Knight, to whom the acquisition of 

 the first crystals was due, kindly furnished about a dozen additional 

 individuals which were somewhat more modified than those first 

 described. 



The habit of these crystals is stout, prismatic. The largest crystal 

 was 31 mm. (1 ^ in.) long in the direction of the vertical axis and 



* Pub. Field Col. Mus., Geol. Ser., Vol. I, p. 228. 



