Guide
Londonite specimens for sale
14 for sale · $370–$4,000 USD
15 in the gallery
Londonite is a complex borosilicate mineral that contains cesium, potassium, rubidium, aluminum, beryllium, boron, and oxygen. It typically forms as transparent to translucent crystals with a pale to yellow-brown tint and a vitreous to resinous luster. The mineral’s cubic or near-cubic habit and its rare, intricate chemical composition make it a striking addition to a cabinet of mineral specimens, especially when well-formed crystals are available.
- Formula
- (Cs,K,Rb)Al4Be4(B,Be)12O28
- Rarity
- Rare
- Stability
- Stable
- Collector interest
- Very High Interest
Buy Londonite specimens
View all 14Where Londonite is found
Top localities
- Antsahanana quarry24 specimens
- Vakinankaratra3 specimens
- Ampanivana Area1 specimen
Guides
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About Londonite
Notable specimens of Londonite have come from Madagascar, a country known for its diverse pegmatite deposits that yield exotic alkali- and beryllium-rich minerals. Collectors prize Londonite for its rarity and the challenge of acquiring well-crystallized examples that clearly display its complex crystal chemistry. The mineral’s unusual combination of alkali metals and borosilicate framework offers a compelling look into borosilicate mineralogy and the behavior of complex alkali-bearing phases in pegmatites.
