FLINT LOURD

rf = 2,5505,

Raies.

t = 2Vyb.

t = iS\

[,53i II

C) H. DuFET, Bull, de la Soc. min., t. VIH, p. 277; i885.

{') Ketteler, Wied. Ann., t. XXXV, p. 694; 1889.

C) E. Mascart, Ann. de Chim. et de Phys. [4], t. XIV, p. 149; »868.

CORPS BIREFRINGENYS.

Raies.

Spath d'Islande.

SPECTRE SOL.VinE

vers t8* {«).

,65oi3 ,65x96 ,65446 ,65846 ,66354 ,66793 ,67620 ,683 30 ,68706 ,68966

,48îi85 ,48409

,49084 I 494 70 h'9777 ,49941 , 5oo 54 , 5o2 56 , 5o4 86 , 5o6 28 . 507 80 ,51028