Zoned, silica-deficient, calcic garnets containing up to 5 mol% F substitution for 0 formed during contact metamorphism of basalts by the Skaergaard intrusion in East Greenland. Fluorian calcic garnets occur as a retrograde alteration of prograde wollastonite and clinopyroxene that fills vesicles and vugs in lavas 30-70 m from the intrusion. Paragenetically equivalent phases include fluorite, w...

The influence of isovalent substitutions Pb 2+ -> Cd and heterovalent Sc 3+ on a superionic Faraday transition in 1-x x F 2 (x=0.33) 2+x (x=0.1) solid solutions based the fluorite-type modification β-PbF with sp. gr. Fm 3 m has been studied. phase can be characterized by temperature T tr λ corresponding to maximum heat capacity curve α beginning structural disorder anion sublattice. Both...