bichowsky: an unusual sulfur crystal 



127 



axial ratios 0.8138 : i : 1.9055. The crystal was about 6 mm. 

 long and weighed 0.27 gram. The following faces were ob- 

 served (both the Miller and Goldschmidt symbols are given in 

 order): c, (001), o; b, (010), 000 ; a, (100), 00 o;e, (loi), 10; m, 

 (no), 00 ; V, (oi3),oV3;«, (on), 01; s, (113), V3; y, (112), V2; 

 p, fin), i; y, (331), 3; r, (311), 31; ^ (211), 21; q, (131), 13; k, 

 (120), GO 2; /?, (130), 00 3; X, (210), 2 CO ; p, (310), 30) . Of these 

 the faces f, (211), 21, and p, (310), 300, are new. The larger 

 faces m, f?, and c were all somewhat pitted and striated and often 

 gave double signals. The other faces all gave first quality sig- 

 nals with the exception of faces 7 and f which in the instruments 

 used gave but faint (though well- 

 defined) ones. Faces 7 and T occurred 

 but once, the first as a narrow im- 

 perfect bevelling of the edge (in)- 

 (iio), the second as a linelike but 

 perfect face bevelling the edge (100)- 

 (311). The remaining faces occurred 

 the theoretical number of times, 

 except faces X and p which occurred 

 three instead of four times each. 



The most unusual feature of this 

 crystal is the well-developed zone 

 [001] containing the brachy- and 

 macro-pinacoids a and b (2 times 

 each), the primary prism ;w (4 times), the rare macro-prisms k 

 and h (4 times), the rare brachy-prism X (3 times)- and the 

 new p face (3 times). Another interesting zone is the oblique 

 zone [oil] containing the faces n, p, r, f, and a. The corre- 

 sponding zone [loT] is less well developed. 



The zonal relations of the crystal are in themselves sufficient 

 to establish the symbols of the new faces, but as a check the crys- 

 tal was carefully measured on a makeshift one-circle goniometer 

 using reflections from different parts of the faces and reading on 

 different parts of the circle. The results agreed closely with 



I have been unable to find the original 



An unusual sulfur crystal. 



2 Given by Gol,dschmidT, loc 

 reference. 



cit. 



