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Londonite

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Formula:
(Cs,K,Rb)Al4Be4(B,Be)12O28
System:
Isometric
Colour:
Milky white to yellow
Lustre:
Vitreous
Hardness:
8
Name:
After Dr. David London (1953– ), Professor of Geology and Geophysics, University of Oklahoma, Norman, Oklahoma, USA, for his contributions to the understanding of granite pegmatites.
The cesium-dominant analogue of Rhodizite. Londonite-Rhodizite Series.

Visit gemdat.org for gemological information about Londonite.

Classification of Londonite

Approved
6.GC.05

6 : BORATES
G : Heptaborates and other megaborates
C : Tekto-dodecaborates
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First Recorded Occurrence of Londonite

General Appearance of First Recorded Material:
Two wellformed crystals 1 cm across (type locality)
Geological Setting of First Recorded Material:
In the pocket zone of complex LCT pegmatite
Associated Minerals at First Recorded Locality:

Physical Properties of Londonite

Vitreous
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Milky white to yellow
Streak:
White
Hardness (Mohs):
8
Fracture:
Conchoidal
Density:
3.34 g/cm3 (Measured)    3.42 g/cm3 (Calculated)

Crystallography of Londonite

Crystal System:
Isometric
Class (H-M):
4 3m - Hextetrahedral
Space Group:
P4 3m
Morphology:
Dodecahedron {110}, tristetrahedron {211}, tetrahedron {111}, deltoid dodecahedron {221} and rare cube {100}
X-Ray Powder Diffraction Data:
d-spacingIntensity
7.320(20)
3.274(50)
2.9898(100)
2.4410(50)
2.2072(20)
2.1132(35)
1.9565(20)
1.8301(20)
1.7755(25)

Optical Data of Londonite

Type:
Isotropic

Chemical Properties of Londonite

Formula:
(Cs,K,Rb)Al4Be4(B,Be)12O28
Essential elements:
All elements listed in formula:

Relationship of Londonite to other Species

Series:
Forms a series with Rhodizite (see here)

Other Names for Londonite

Name in Other Languages:
German:Londonit
Simplified Chinese:硼铯铝铍石
Spanish:Londonita
Traditional Chinese:硼銫鋁鈹石

Other Information

weak yellow-green fluorescence under short-wave UV light
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Londonite

Reference List:
Frondel, C. and J. Ito (1965) Composition of rhodizite. Tschermaks Mineral. Petrog. Mitt., 10, 409–412.

Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Simmons, W.B., F. Pezzotta, A.U. Falster, and K.L. Webber (2001) Londonite, a new mineral species: the Cs-dominant analogue of rhodizite from the Antandrokomby granitic pegmatite, Madagascar. Canadian Mineralogist (2001): 39: 747-755.

Internet Links for Londonite

Localities for Londonite

(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Madagascar
 
  • Antananarivo Province
    • Vakinankaratra Region
      • Betafo District
        • Andrembesoa Commune
          • Ampanivana area
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. Canadian Mineralogist 39: 747-755/ [MinRec 33:165]
          • FKT Antsentsindrano
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. Can. Min., 39, 747-755; [MinRec 33:165]
          • Tetezantsio-Andoabatokely Pegmatite Field
Enrico Bonacina photo & specimen, analyzed by F.Pezzotta
        • Manapa pegmatite Field
Knut Edvard Larsen collection, # MM-3395, M-713 obtained from & analyzed by Dr. Federico Pezzotta, Italy.
Arliguie M collection
      • Sahatany Pegmatite Field (Mt Ibity area)
        • Manandona Valley
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. Canadian Mineralogist 39: 747-755/ MinRec 33:165]
Russia
 
  • Urals Region
    • Middle Urals
      • Sverdlovskaya Oblast'
        • Rezh District
          • Shaitanka District
Pekov, I. V., Yakubovich, O.V., Massa, W., Chukanov, N. V., Kononkova, N.N., Agakhanov, A. A. & Karpenko, V. Y. (2010): Londonite from the Urals, and new aspects of the crystal chemistry of the rhodizite-londonite series. Canadian Mineralogist. 48: 241-254
        • Sarapulka District (Murzinka)
Pekov, I. V., Yakubovich, O.V., Massa, W., Chukanov, N. V., Kononkova, N.N., Agakhanov, A. A. & Karpenko, V. Y. (2010): Londonite from the Urals, and new aspects of the crystal chemistry of the rhodizite-londonite series. Canadian Mineralogist. 48: 241-254
        • Yuzhakovo Village
          • Alabashka pegmatite field
Pekov, I. V., Yakubovich, O.V., Massa, W., Chukanov, N. V., Kononkova, N.N., Agakhanov, A. A. & Karpenko, V. Y. (2010): Londonite from the Urals, and new aspects of the crystal chemistry of the rhodizite-londonite series. Canadian Mineralogist. 48: 241-254
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