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Londonite from
Ampanivana pegmatite, Ampanivana area, Andrembesoa, Betafo District, Vakinankaratra, Madagascar


03828500017372441415873.jpg
Londonite

Ampanivana pegmatite, Ampanivana area, Andrembesoa, Betafo District, Vakinankaratra, Madagascar
03828500017372441415873.jpg
Londonite

Ampanivana pegmatite, Ampanivana area, Andrembesoa, Betafo District, Vakinankaratra, Madagascar
02504100017272026914945.jpg
Londonite

Ampanivana pegmatite, Ampanivana area, Andrembesoa, Betafo District, Vakinankaratra, Madagascar
Locality type:Pegmatite
Classification
Species:Londonite
Formula:CsBe4Al4(B11Be)O28
Comments:Londonite is often observed growing on purple-red tourmaline crystals.

"Several crystals from Ampanivana found in several different pockets has been analyzed by WDS microprobe, included in resin, cut and polished, and their compositions fall all in the londonite field. Actually the Cs contents of the londonites from Ampanivana are among the highest I found for this specie". Personal message from Federico Pezzotta to Konrad Reindl febr. 2017.
Habit:dodecahedral crystals up to 1 cm
Colour:white and pale yellow
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Londonite data
Locality Data:Click here to view Ampanivana pegmatite, Ampanivana area, Andrembesoa, Betafo District, Vakinankaratra, Madagascar
Data Identifiers
Mindat Occurrence Record ID:47522
Long-form Identifier:1:3:47522:2
GUID (UUID V4):0
Nearest other occurrences of Londonite
10.6km (6.6 miles) ⓘTetezantsio pegmatites, Tetezantsio-Andoabatokely Pegmatite Field, Andrembesoa, Betafo District, Vakinankaratra, Madagascar
31.9km (19.8 miles) ⓘManjaka (Sahananana), Sahatany Valley, Ibity, Antsirabe II District, Vakinankaratra, Madagascar
36.3km (22.5 miles) ⓘAntandrokomby pegmatite, Manandona Valley, Sahatsiho Ambohimanjaka, Ambositra District, Amoron'i Mania, Madagascar
References
Simmons, W. B.; Pezzotta, F.; Falster, A. U.; Webber, K. L. (2001) Londonite, a new mineral species: the Cs-dominant analogue of rhodizite from the Antandrokomby granitic pegmatite, Madagascar. The Canadian Mineralogist, 39 (3). 747-755 doi:10.2113/gscanmin.39.3.747
 
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