NJG12-33
1931
Meliphanite, Leucophanite and their relation to Melilite
12
1, 2, 3, 4
577-582

In a previous paper published some time ago I considered the chemical composition of the two minerals Meliphanite (Melinophan) and Leucophanite (Leukophan) on the basis of our modern knowledge of the mechanism of isomorphous substitution. My interpretation of the analyses is given in table 2. It leads definitely to the following formulae:

Meliphanite: (Ca, Na) 2Be(Si, A1)2(O, F)7
Leucophanite: (Ca, Na)2BeSi2(O, OH, F)7
For comparison the formulae derived by W. C. Brøgger will be given:
Meliphanite: Ca4Na2Be4Si6O20F2
Leucophanite: Ca8Na8Be3Si6O18F8

029-196x
Print