Formula: (Cs,K,Rb)Al₄Be₄(B,Be)₁₂O₂₈

Species:

Colour: Milky white to pale yellow; yellow

Lustre: Vitreous

Hardness: 8

Specific Gravity: 3.34

Crystal System: Isometric

Name: Named by William B. Simmons, F. Pezzotta, A.U. Falster, and W.L. Webber in 2001 in honor of David London (1953 – ), Professor of Geology and Geophysics, University of Oklahoma, Norman, Oklahoma, USA, for his contributions to the understanding of granite pegmatites.

Type Locality: Antandrokomby pegmatite, Manandona Valley, Sahatsiho Ambohimanjaka, Ambositra, Amoron’i Mania – Madagascar

The cesium-dominant analogue of Rhodizite. Londonite-Rhodizite Series.