Minerals of the Composition MgSiO y 429 



Table XIV (see fig. 18). 

 Time. Monoclinic pyroxene. 



rain. 15700 



8500 



1 " 8645 



9300 



2 " 9930 



10905 



3 " 11800 



12630 



4 " 13325 



890 



5 " 14290 



555 



6 " 808 



975 



7 " 15095 



185 



8 " 242 



309 



9 " 357 



386 



10 " 416 



440 



11 " 458 



476 



12 " 492 



504 



13 " 514 



524 



14 " 533 



541 



15 " 548 



555 



16 " 561 



567 



17 " 572 



577 



18 " 581 



585 



for am pinhole, which indicates that it is the least stable of the 

 three forms. As compared with the curve of wollastonite glass, 

 the form of the (orthorhombic) amphibole curve is significant. 

 The change of the former begins at a much lower temperature 

 and forms a smooth curve, while the latter changes at higher 

 temperatures and, as a result, the influence of the heat change 

 continues until the maximum temperature is almost reached ; 

 consequently the curve shows a sharp change in direction near 

 the top. 



15700 



15700 





10100 



9520 



9400 



9915 



9848 



10615 



10605 



11475 



11515 



12270 



12315 



13005 



13075 



605 



715 



14113 



14170 



455 



510 



228 



763 



915 



938 



15052 



15068 



152 



161 



230 



233 



289 



287 



337 



331 



374 



365 



406 



394 



431 



417 



453 



437 



471 



454 



488 



469 



501 



481 



514 



492 



525 



503 



534 



511 



543 



520 



551 



527 



558 



533 



565 ■ 



539 



571 



545 



577 



550 



582 



555 



587 



559 



592 



563 



597 



568 



Enstatite. 



15700 



15700 



9800 



ioooo 



8715 * 



9765 



9325 



10210 



10415 



11035 



11640 



12010 



12620 



890 



13475 



13658 



14065 



14205 



510 



615 



797 



877 



15000 



15055 



135 



179 



238 



265 



308 



324 



366 . 



372 



407 



410 



• 443 



443 



468 



462 



482 



481 





499 





511 





523 





533 





542 





551 





558 





565 





570 





575 





579 





585 





588 





596 





600 





605 





604 



