A group of 15 yellow, translucent londonite-rhodizite crystals, 2-4 mm in size. All exhibit dodecahedral morphology to some extent. Potassium-dominant rhodizite - (K,Cs)Al₄Be₄(B,Be)₁₂O₂₈ and its cesium/rubidium-dominant analog londonite - (Cs, K, Rb)Al₄Be₄(B,Be)₁₂O₂₈ are chemically similar borates, often intergrown, and cannot be distinguished without chemical analysis.