912 
Specific 
Compound Meltingpoint Weight Observers Refraction, etc. 
BeSiO3 DOE: JAEGER and VAN KLOOSTER — 
MgSi0z 1554° C. Salo ALLEN and WRIGHT nj = 1.641 ; m9 = 1.648; 13 = 1.663 
Mg,SiO, S11502'E. — — — 
CaSi03 1540° C. — Day, ALLEN, SHEPHERD and WHITE ny = 1.609; nm. = 1.650 
CayStO4 2130° C. Eler id. 7 delden 20 sr 
SrSi03 15789 + 1°C, 3.652 JAEGER and VAN KLOOSTER nj = 1.620; n, = 1.590 
SreSiO4 lS OC — id. — 
BaSiOz 1604° + 0.95 C. 4.435 id. nm, = 1.610; m2 = 1.667 
Ba,Si0, >1750° C. — id. — 
ZnSiO, 1437° + 1°C. 3.52 id. ny = 1.623; n, = 1.616 
ZnySiO4 15099.5 +: 0.95 GC. — Id. O77 — LON 
CdSi03 1242? + 0.95 C. 4,928 id. Both greater than 1.739 
Cd‚SiO4 1252° tot 12439 + 19 C, = id. Both greater than 1.739 
MnSiO3z 1278 SS ING; 3.716 id. ny = 1139 End 
Mn, SiO, 1290° tot 1300° C. 4.044 id. Both greater than 1.739 
(tephroite) 
CaMg(Si03), 1391°C, 3215 ALLEN and WHITE ny = 1.664; 2, = 1.671; m3 = 1.694 
