A. J. Moses — New Mercury Minerals from. Texas. 257 





Measured 



Calculated 







Coordinate 



Coordinate 





Forms. 



Angles. 



Ang 



jles. 

 P 



Eemarks. 









P 





c 



{001} 



90° 00' 



15° 44' 







Well developed on 1, 2 and 3. 



h 



{010} 



00 



90 00 



...... 







Minute face on 3. 



a 



hooj 

 {i8o;- 



{230} 



90 00 

 33 07 



a 









Large on 4, small on 1 and 3. 



d 



33° 08' 



::".:::i 



Microscopic on 3. 



6 



52 21 



a 



52 88 





-1 



Microscopic on 4. 



d 



{011} 



7 48 



64 13 



7 58 



64° 



02'' 



Well developed on 3, poorly on 4. 



f 



{013} 



22 28 86 20 



22 34 



36 



17 



Fair on 3, minute on 1 and 2. 



h 



r015| 



34 50 !26 12 



84 48 



26 



19 



Minute face on 1. 



t 



■lioej 



90 00 



43 14 



90 00 



42 



56 



On all four crystals, prominent 



1 on 3. 



Prominent on 2, small on 1. 



y 



{103} 



a 



57 57 



(• 



57 



39 



w 



non 



{106} 



a 



76 25 



a 



76 



31 



Striated face on 3. 



n 



90 00 



20 80i 



90 00 



20 



09 



Minute faces on 3. 



u 



{103} 



ii 



45 40 



a 



45 



26 



Indistinct on 3 and 4. 



m 



{508} 



i( 



65 25 



a 



65 



37 



Large dull face on 1. 



X 



{7, 0, 10} 



il 



67 40 



" 



67 



43 



Striations on 100 of No. 4, large 

 face on 3. 



z 



{101} 



{155} 



ii 



74 08 



a 



74 



80 



Fine edge on 3. 



V 



27 31 



66 19 



27 55 



66 



81 



Narrow minute face on 8. 



P 



{183} 



38 11 



68 42 



88 21 



68 



54 



il a a 



r 



{11,25,25} 



{7,11,11} 



45 08 



70 58 



45 00 



70 



50 



Minute triangular face on 3, 



i 



58 59 



74 80 



54 10 



73 



56 



i Minute faces on 3 and 4. 



s 



{111} 



64 22 



78 04 



64 80 



78 



03 



1 '' 2 and 4. 



I 



{1,3,15} 



53 16 



84 15 



58 28 



34 



17 



1 " land 4. 



TV 



1136} 

 {134} 



42 26 



58 59 



42 55 



54 



13 



Distinct on 4. 



k 



39 17 



63 20 



89 57 



68 



12 



Distinct triangular on 3. 



e 



{138} 



26 54 



66 14 



27 13 



66 



22 



Prominent on 3 and 4. 



I 



{11,25,25; 

 {13,20.20} 



36 12 J68 22 



35 52 



68 



16 



Large striated face on 3. 



9 



48 37 



72 02 



[48 36 



71 



59 



Very prpminent on 3, visible on 4. 



.0 



{ill} 



61 02 



76 32 



61 12 



76 



40 



Very prominent on 2, visible on 

 1 and 3. 



7 



{977} 



67 42 



79 28 



67 16 



79 



15 



Prominent on 4. 



l3 



{1.3,15} 



2 40 



22 03^ 



i 2 18 



22 



08 



Minute face on 1. 



q. 



{115} 



51 21 



82 51 



51 41 



88 



16 



1 Small but distinct on 1. 



a 1 {]13} 



56 34 



51 00 



57 02 



51 



14 



Minute faces on 1 and 2. 



The value of ^ was determined to be 74° 16^, the average 

 of determinations from the angles of <?, f and A. 

 The ratio between the axes was determined to be 



d :~b : c — 0-5306 : 1 : 2-0385 



the average of eleven determinations for each axis from the 

 angles of p, s, ???, k, e^ Z, ^, o, 7, q and a, two for d from the t 

 and X angles and two for c from the f and h angles. The 

 maximum deviations from the average w^ere for a '0139, for 

 h — 0*0214:. Much more complex indices could be chosen for 

 some of the forms which w^ould check more accurately the 

 measured angles, bnt as a certain error is undoubtedly due to 

 a blurring of the images from the microscopic faces, it is 

 believed the simpler indices chosen are generally correct. 



