No. 2385. CRYSTALLOGRAPHIC STUDY OF DATOLITE— SHANNON. 515 



4. Forms occasionally or rarely present, including all other forms 

 listed : 



Table 3. — Datolilc. 



Comparison of average measured angles with calculated angles for previously 

 described forms observed on datolite from Westfield during the present examination. 

 Dana orientation. 



Letter. 



my 



A 



Q 



U 



Mi 



Q 



M 



Miller. 



100 

 010 

 001 



110 

 120 

 130 



140 

 230 

 530 



011 

 012 

 013 



014 



067? 



101 



102 

 103 

 104 



106? 



203 



302 



308 

 101 

 102 



201 

 302 

 111 



112 

 121 



122 



123 

 231 

 312 



324 

 454 

 111 



112 

 113 



114 



115 

 116 

 121 



122 

 123 

 124 



126? 

 "132? 

 135 



T3S? 



148 



1.4.10 



223 

 227 

 231 



332 

 546 

 811 



Measured. 



No.* 



Qualit y. 



Very good. 



do 



Good 



Very good. 

 do 



Medium... 



Poor 



Good 



Fair 



Very good. 

 ....do.... 

 do.... 



Good 



Medium... 

 Poor 



Very good. 



Good 



do.... 



Very poor. 



Good 



Poor 



Good 



....do.... 



Very good. 



Dull 



Very good. 

 do 



90 00 



00 



90 00 



57 42 



38 14 



27 42 



20 55 



46 28 



69 31 



19 



32 



58 



36 



2 41 



90 00 



90 00 



90 10 



89 57 



90 00 

 90 18 

 S9 56 



90 26 



90 00 



89 55 



do.... 



do.... 



do.... 



do.... 



Poor 



Very good. 



Poor 



Very poor. 

 Very good. 



....do.... 

 ....do.... 

 ....do.... 



90 01 



57 47 



57 40 



38 23 



38 26 



38 29 



44 48 



78 05 



68 26 



53 29 



57 33 



Good... 

 do. 



do. 



Very good. 



Good 



Very good. 



Good 



Fair 



Very good. 



Fair 



Very poor. 



Fair 



Poor 



Very good. 



Good 



Very poor. 

 Fair 



37 57 



37 56 



37 57 



36 27 



25 49 



27 16 



29 44 



23 08 



23 08 



57 41 



57 56 



46 28 



57 27 



61 07 



85 00 



90 00 



90 00 



11 



90 00 



90 00 



90 00 



90 00 



90 00 



90 00 



51 35 



32 15 



22 34 



17 23 



48 20 



59 34 



44 57 



34 20 



26 51 



21 00 



54 08 



69 31 



37 14 



63 10 



44 46 



71 27 

 67 37 



49 50 



72 48 

 58 15 



47 07 



81 34 



71 56 



60 47 



69 01 



66 57 



49 38 



38 12 



30 36 



25 12 

 21 02 



73 11 



58 09 

 46 51 

 38 45 



26 58 

 66 31 

 40 30 



30 32 



31 00 

 28 26 



57 00 



33 33 



79 35 



73 22 



59 49 

 86 05 



Calculated. 



90 00 



00 



90 00 



57 37 



38 14 



27 43 



21 30 



46 25 



69 10 



07 



14 



20 



27 



08 



90 00 



90 00 



90 00 



90 00 



90 00 



90 00 



90 00 



90 00 



90 00 



90 00 



90 00 



90 00 



57 38 



57 40 



38 15 



38 19 



38 21 



46 26 



78 04 



67 06 



51 36 



57 34 



57 33 



57 31 



57 29 



57 27 



57 24 



38 12 



38 10 



3S 08 



38 06 



38 02 



27 40 



27 31 



27 29 



21 19 



21 16 



57 34 



57 30 



46 24 



57 35 



03 04 



85 28 



90 00 



90 00 



09 



90 00 



90 00 



90 00 



90 00 



90 00 



90 00 



51 41 



32 19 

 22 52 



17 33 

 47 19 

 63 24 



45 00 



33 43 

 26 37 



18 31 

 53 07 

 71 18 



36 54 



63 21 

 44 51 



75 55 



71 18 



67 04 



49 48 



72 14 

 58 12 



47 06 



79 34 



71 55 



58 26 



68 34 

 67 03 



49 42 



38 09 



30 29 



25 12 



21 23 



72 46 



5S 09 



47 00 



38 49 



28 19 



64 59 

 40 35 



28 09 



34 11 

 2S 30 



57 33 



33 56 



79 42 



74 14 



61 46 



86 26 



Number of measurements included in the average. 



