ABT. 11 ROSSITE AND METAROSSITE FOSHAG AND HESS 



Table 3. — Measurement of m {110) rossite 



Crystal No. 



Reflection 



Size of face 



fi 



2 



Excellent 



do 



do 



Good - _ 



Broad 



o 



54 

 53 

 53 

 53 

 53 

 53 

 52 

 54 

 52 

 52 

 52 



47 



55 



31 



28 



3 



5 



45 



43 



57 



2 



27 



3-- 

 3_. 

 4 





do 



do 



do - 



4-. 

 6.- 



8 





do 



do 



- __do - 



Medium 



do 



Broad .- 



10_ 

 10- 

 12- 





Excellent 



-- _do _- 





Good- -- 



Medium 



Broad 



do 





Excellent 



do 



Average _ 



53 



48 









Table 4. — Measurement of c {001), rossite 



Crystal No. 



Reflection 



Size of face 







p 



2 _ 



Excellent 



---do 



-__do 



---do 



---do 



Large 



---do 



---do 



---do 



_--do 



o / 



73 39 



'""73"'ii' 



72 29 

 72 18 



o / 



31 34 

 31 24 

 31 27 

 31 26 

 31 43 



3 



4 



7 



11 



Average 



72 54 



31 31 









Table 5. — Measurement of y {101) rossite 



Crystal No. 



Reflection 



Size of face 







p 



15 



1 _ - _- 



Good 



do 



do 



Twin, excellent. - 

 do 



Medium 



---do 



...do 



-._do 



__-do 



o 



44 

 44 

 43 

 44 

 44 



20 

 30 

 47 

 6 

 24 



o / 



-87 22 

 86 27 

 86 5 



1 



Average.. 



44 



13 



-86 38 





t 



In this compilation the angles are listed as " excellent " when the 

 readings between two faces were designated " excellent " during meas- 

 urement ; and listed as " good " when the readings for the faces were 

 between " excellent " and " good " or between " good " and " good." It 

 will be noted that even in the cases where the faces are all designated as 

 "excellent " the measurements range from 83° 38' to 84° 49', a differ- 

 ence of over 3° for <^ for (100) ; and from 52° 2' to 54° 47', a difference 

 of almost 3° for ^ for (001). This variation is large for crystals so 



