468 A. F. Rogers — Pyrite Crystals from Bingham, Utah. 



The. following is a list of combinations and habits, the forms 

 under each being arranged according to their prominence. The 

 list begins with dominant cubic habit and ends with dominant 

 pyritohedral habit. 



1. aeon 



2. a e o n 



3. a e o n m s \x 



4. a en so m fx 



5. aeon 



6. aeonS fx 



7. e a?i o sm /n8<l) pY 



8. eao n psY 8 cf>m p (see fig. 1 ). 



9. eaonms 6 



10. eaons 



11. eo an m 



12. eoansm 



13. e 71771 



14. eon 



Data for the identification of the new forms are given in 

 comparison of the measured with the calculated 



the following 



211 

 10-5-8 

 430 

 371 

 210 

 211 



10-5- 



213 



12-9- 



371 



10-7- 



1-10 



Cryst. 7 Cryst. £ 



11° 28' 11° 31 



17 44 17 41 



3 48^ 



9 34 



34 32 



Cryst. 11 Calculated 



11° 30' 



17 42 



3 49 



14° 58' 14 58 



9 38 



33 33| 



Fig. 1. 



Fig. 1 represents crystal No. 8. 

 This gives a general idea of the 

 average habit and shows three of 

 the four new forms. This figure is 

 simply a sketch inked in with a 

 straight edge and not the regulation 

 chirographic projection. 



In addition to the forms charac- 

 teristic for this locality, the most 

 remarkable feature of these crystals 

 is the prominence of the zone [100 : 

 411 : 311 : 211 : 111]. This is shown not only by the presence 

 of the three trapezohedrons indicated but also by oscillatory 

 striations on the octahedron faces and occasionally on the cube 

 faces. The poverty of pyritohedrons is also striking, there 

 being but two pyritohedrons besides j210J. This is also sub- 

 stantiated by the fact that vertical striations rarely occur either 

 on the cube or on the pyritohedrou J210J. 



Stanford University, Feb., 1909. 



