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Londonite

Big Photo

Antsongombato gem mine, FKT Antsentsindrano, Andrembesoa Commune, Betafo District, Vakinankaratra Region (Betafo - Antsirabé region), Antananarivo Province, Madagascar
© Rob Lavinsky

Show Londonite Photos (22)
Formula:
(Cs,K,Rb)Al
 
4
Be
 
4
(B,Be)
 
12
O
 
28
System:IsometricColour:Milky white to yellow
Lustre:VitreousHardness: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.

Classification of Londonite

IMA status:Approved
Nickel-Strunz 10th (pending) edition ID:6.GC.05

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

Type Locality:Antandrokomby pegmatite, Manandona Valley, Sahatany Pegmatite Field (Mt Bity (Ibity) area), Vakinankaratra Region (Betafo - Antsirabé region), Antananarivo Province, Madagascar

Physical Properties of Londonite

Lustre:Vitreous
Colour:Milky white to yellow
Streak:White
Hardness (Mohs):8

Crystallography of Londonite

Crystal System:Isometric

Optical Data of Londonite

Type:Isotropic

Chemical Properties of Londonite

Formula:
(Cs,K,Rb)Al
 
4
Be
 
4
(B,Be)
 
12
O
 
28
Essential elements:Al, B, Be, Cs, O
All elements listed in formula:Al, B, Be, Cs, K, O, Rb

Relationship of Londonite to other Species

Series:Forms a series with Rhodizite (see here)
Related Minerals - Nickel-Strunz Grouping):

- +
6.GC.05Rhodizite
(K,Cs)Al
 
4
Be
 
4
(B,Be)
 
12
O
 
28

Other Names for Londonite

Synonyms:
IMA1999-014
Other Languages:
German:Londonit
Russian:Лондонит
Spanish:Londonita

Other Information

Health Warning: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

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    Localities for Londonite

    (TL) indicates type locality. ? 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 - Antsirabé 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]
          • Manapa pegmatite Field
    		Knut Edvard Larsen collection, obtained & analyzed by Dr. Federico Pezzotta, Italy.
    Arliguie M collection
        • Sahatany Pegmatite Field (Mt Bity (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]
    Mineral and/or Locality
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