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Londonite: CsAl4Be4(B,Be)12O28
Comments: A dodecahedral crystal of londonite. Location: Antandrokomby pegmatite, Manandona valley, Sahatany Valley, Betafo - Antsirabé region, Antananarivo Province, Madagascar. Scale: Crystal size 7 mm. © Thomas Witzke / Abraxas-Verlag
Comments: A yellow , lustrous, well developed londonite crystal 1.2 cm. on matrix. Location: Antandrokomby, Sahatany valley, Madagascar. Scale: Crystal size 1.2 cm. © Sandro Maggia/Minernet.it