Wright and Larsen — Quartz as a Geologic Thermometer. 439 



Table VI. 







*4-l 







Intergrowths 



Twinning 





= 



i 2 





nd 



1 



1 





t3 





i 



6 



w 



'S ® a 



tic's, c 



CD •.-. 



Degree 



of 



Shattering. 



CD 



C 



CD 



h4 



Character 



of 



intergrowth 



CD 



. cd 



o fl 



CD * 

 X! CD 





I 







&J0 



CD 



6 





~o 



1 H 



1 



6 



5 



Few cracks, clear 



6 



i -- 









6 



c* 



g 



21 



2 



" 



6 



9 



3 



Straight & regular 



2 



14 



c 



8 



11 



8 



" 



2 





8 



Regular 



3 



7 



& 



4 



10 



7 



" 



10 



__ 







10 



1 



a 



5 



24 



3 



" 



2 



18 







14 



10 



d 



6 



12 



3 



a 



8 



__ 



~4 



Straight & regular 



11 



1 



a 



? 



11 



6 



11 





11 











11 



c 



8 



8 



5 



" 



5 



2 



i 



Regular 



~2 



1 



d 



9 



16 



6 



" 



8 



8 



__ 





4 



12 



a 



10 



6 



8 



t< 



o 



2 







4 







11 



5 



10 



'• 



5 





__ 





1 



i 



a 



12 



11 



12 



ti 





ii 







2 



. 9 



a 



13 



8 



8 



a 



4 



4 







1 



4 



a 



11 



8 



10 



i i 





8 



_. 





6 



6 



a 



15 



15 



6 



" 





1 



ii 



Regular 



1 



10 



a 



16 



14 



5 



" 



~8 



3 



l 



" 



4 



9 



a 



17 



10 



3 



a 





4 







2 



2 



d 



18 



15 



5 



Some cracks 



9 



4 



"l 



Regular 



8 



3 



f 



19 



7 



7 



Few cracks, clear 







7 



" 





7 



a 



20 



9 



2 



'• 



9 









5 



4 



a 



21 



12 



2 



Many cracks 



1 



ii 



__ 





8 



3 



d 



22 



12 



2 I 



" 



9 



3 







2 



10 



f 



23 



13 



1-5 



" 



2 



11 







8 



5 



f 



24 



11 



1 



Much fractured 



3 



8 







5 



5 



f 



25 



21 



2 i 







21 









5 



f 



26 



6 



2 ! 



" 



. 



« 







"i 



4 



f 



27 



11 



3 



Some cracks 



3 



5 









4 



e 



2811 



2 



" 



4 



4 



"§ 



Irregular 



"8 



3 



e 



2913 



3 



" 



4 



9 



__ 







8 



f 



30 4 



2 



" 



4 





__ 





"i 



3 



f 



3114 



2 



" 



7 



~3 



__ 





__ 



3 



f 



32 4 



1 



Much fractured 



2 



2 









3 



f 



33 



3 



1 





1 



2 









3 



f 



34 



4 



2 







4 



__ 







3 



f 



35 



7 



2 





2 



5 







i 



3 



f 



36 



10 



2 





4 



5 









2 



5 



f 



37 



3 



2 





2 





2 



Fairly regular 



2 



1 



f 



38 



10 



2 





5 



4 



1 



; l 



1 



7 



f 



39 



2 



2 





.. 



2 



.. 





1 



1 



f 



40 



6 



3 





1 



3 



__ 





__ 



4 



f 



41 



3 



3 







3 



_. 







3 



f 



42 



16 



2 





7 



9 



__ 





2 



i7 



< 



f 



43 



16 



1 





5 



7 



._ 







__ 



8 



f 



44 



5 



1 





5 



-- 



-- 





" 



5 



f 



* In this column the letter a signifies regular ; &, usually regular ; c, often 

 irregular, tendency toward regularity ; d, rather irregular ; e, small, rather irreg- 

 ular ; /, irregular and small. 



