The Rare Earths: Their Occurrence, Chemistry, and Technology

by Stanley Isaac Levy

Massive.

G = 3·94-4·01. H = 3¹⁄₂. Brown to yellow; translucent.

Cornwall; Scoville, Connecticut, U.S.A.

Rhönite.

(Na,K,H)₃Ca₃(Fe´´,Mg)₁₅(Al,Fe´´´)₁₆(Si,Ti)₂₁O₉₀. TiO₂ = 9·5%.

Anorthic, isomorphous with Aenigmatite.

G = 3·5-4·3. Brown, with strong pleochroism.

Rhön Mountains, Saxony.

Rinkite.

A titanosilicate closely allied to [Mosandrite] and [Johnstrupite] (q.v.)—Na₉Ca₁₁Ce₃(Ti,Th)₄₁Si₁₂O₄₆? Cer = 21; Yttr = 0·4-1·4; TiO₂ = 13-14%.