OBSERVATIONS SUR LES CRISTAUX DE DIOPSIDE 



a{iOO) = 



--h^ 



n (421) = 



-- (d^lU'^l^h^) 



l (241)=: (^/^i/y) 



1 



h (010) = 



--g' 



u (221) = 



'- d'i'^ 



^(461) =(^1/2^,1/10^1) 1 



2 m 



c (001) = 



^p 



r(3ii) = 



r (r^V2^l/'V^l) 



y (151)= (ôVW/y) 1 



I3 







6^(312) = 



= [d^d'^im) 



,6 (885) = Ô-V16 





m(110)=: 



- m 



<ï>(152) = 



-- [d^/'^i^) 







/'(310) = 



^W' 



^.(121) = 



= {d^b^/Y) 



G(201)=aV2 





X(510) = 



= ^3/2 



cr (112) = 



--d' 



A (433) = {dki'/Vi^i^) 





co (120) = 



--9' 



(221) = 



-- ¥r'^ 



P (134) = (d^b^lY'^) 



O) 



i (130) = 



--g' 



A (331) = 



^b^i^ 



Q (136) = (^iôV2^i/3) 



r (354) = (i^WAy/2) 1 



a (465) = [b^/H^/^^gy'-) \ 





i9(101) = 



--a' 



.(111) = 



^ b^/^- 





r(301) = 



= 0V3 



r (112) = 



--¥ 



fl 



M (401) = 



r 0l/4 



k (312) = 



--[Ub^im) 



h (687) = (ôV^^/iy/T) / 



ri 



^(501) = 



= 0V5 



^.(332) = 



,^1/3 



î (18.20.19) = (^^V2^V38^1/19) 



ss 



e (011) = 



= ^1 



.^ (335) = 



-_ ^5/6 



h (235) = (^>W/5^V5) 



s 



z (021) = 



.6^/2 







E (347) = (ÔV^V7^V7) 



s 



TT (041) = 



= ^1/4 



^'(920) = 



= mn 



U(152)=(èV2#/3pi) 









J(702) = 



-- 0^1^ 



m (13.21. 13) = (^i/8^V3Y/i3) ■ 





?.«(111) = 



= d}'^ 



g (732) = 



-- {dyn^rofi^) 







Dans son grand mémoire de 1886, La Valle donne le tableau d'incidences suivant 



Angles mesurés. 



hW^'' 168*'7'55" 



h%^ 160°43'33" 



¥m 133*>36'6'' 



hY' 107«3r20'' 



kW- 162°3'10' 



hW^ 155°59'45" 



¥p 105°48'28' 



hW 74<'25'8'' 



^*cV4 156°9'ir' 



^V/2. 138''36'14" 



d'/Y 114M5'30'' 



^V2/^i 126°449" 



d^/^m 134°43'45" 



d^^p 146°7'21" 



(#/2#/6y^i) ^1 . . . . 113°9'20'' 



d^/Y 124°21'14'^ 



^i/W 132''33'20' 



150°50'17" 



164°0'4" 



104°56'14" 



143*'28'10" 



164''10' 



d^/'^m 



6?V4^1/2 



(d^/^d^/W) g^ . . . 



(^^1/2^1/4^1) ^1 . . . 



(^v2^i/y)cV2 . . 



d^/^d^ 165°52' 



d^p 160°19' 



(^1/2^1/10^1) ^i/2 



(d'/w/^Y) g^- 



Id^/^d'/W) g^ . 



(6/1/2^1/5/^1) hl , 



(d*rfi/^AV3) ^1 . 

 {d^dy^h^/'â) u . 

 [d^d^'lVim ^V2 



145°3U 



141^13' 



109°52' 



149-26' 



lir 53^40'' 



13r54' 



173*'44' 



Angles calculés. 



168°8'34" 

 160°42'50" 

 133°36'34" 

 107°36'59" 

 162«>4'35" 

 156°r54" 

 105'5U7" 

 74°29'7" 

 156°12'33'' 

 138'*35'48'' 

 114°14'6' 

 126°4'6" 

 134°4U3l" 

 146''10'3'' 

 113°25'47" 

 124°19'58" 

 132°18'24' 

 150°45'56" 

 163°55'35" 

 104°56'53' 

 143^28'50'' 

 164°0'46'' 

 165°52'22'' 

 160°17'41" 

 144°36'40" 

 142°25'58'' 

 109°45'30" 

 149°18'49" 

 112°17'5r^ 

 13r39'24'^ 

 174''24'4r' 



Angles mesurés. Angles calculés. 



(^1^1/2^1/2) p 



[d^b^Y^^) ^'/' 



[d^b^Y^'^) ^* 

 [d^b^^g'/^) ^1/2 



{dW^-g^^) g^ 



[d^b^Y^^] P 

 (d^b^'Y^^) à^ 

 b^Y - • • ■ 

 ^1/4/^1 (arrière 

 &V4p .... 

 Z^i/^^m (arrière 

 ^i/^/i^ (arrière 

 b^H'^l^ . . . 



ÔV4^1/2 _ ^ _ 



^i/^m (arrière 

 b^^p .... 

 ^i/W (arrière 

 b^^p .... 



^1/2^1/4 

 ^1/2^1/2 , ^ 



b'/m (arrière 



ÔV2gl/2 _ , ^ 



^v 



^Ip 



b^d'/K . . . 



(b^¥i^U) Z>V4 

 [¥bym) 61/2 

 {b'byW)p . 

 ^>i/3^>i/^ . . . 



^,1/3^1/2 

 ^l/'^l .... 



156''33'20'^ 



164^9' 



157'>48'30" 



144°57'40" 



112°43'20" 



163°3U 



109M8" 



132°5'54'' 



118''26'12'' 



114°40'18" 



144°28'48" 



132°3'40" 



109°2U20'' 



113°9'10'' 



155°28'9" 



103°40' 



124°40'20" 



138°5'17" 



156°46'40'' 



130°37'44" 



103°16'50'^ 



149°32^ 



106°29'51" 



157°34'40'' 



i4r5r 



150M5' 

 160M3'30'' 

 133°2U 

 170''8' 



166°3U30" 

 127°30' 



156°4740'' 



164'*2'37" 



157-44'53' 



144°43'36" 



112''8'45" 



163°51'43" 



109°54'26" 



132°540'^ 



118°29'35" 



114''37'5'' 



144«'3r21'' 



132''ir41'' 



109*^12'!'' 



112° 5744" 



155°33^42'' 



103'^34'44'' 



124^35^3" 



137°56'24/' 



156M0'40'' 



130°28'57" 



103°26'57'^ 



149''29' 



106''25'52" 



157°27'4'' 



l4r47^30" 



150°48'23'' 

 160°16'43'' 

 133°11'30" 

 170°36'9'' 

 166°4'32" 

 127°40'10'' 



