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Londonite

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David London
Formula:
(Cs,K,Rb)Al4Be4(B,Be)12O28
Colour:
Milky white to pale yellow; yellow
Lustre:
Vitreous
Hardness:
8
Specific Gravity:
3.34
Crystal System:
Isometric
Name:
Named by William B. Simmons, F. Pezzotta, A.U. Falster, and W.L. Webber in 2001 in honor of 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.
NOTE:

Specimens from Madagascar without analysis should be labelled as londonite-rhodizite series. Many crystals contain complex patchy zones of both londonite and rhodizite which are only visible by back-scattered electron imageing.

Londonite is the sixth oxysalt mineral with species-defining Cs (discluding silicates), the other ones being ramanite-(Cs) (another borate), cesiodymite (sulphate), caesiopharmacosiderite (arsenate), margaritasite (vanadate), and mccrillisite (phosphate).

Visit gemdat.org for gemological information about Londonite.


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Classification of LondoniteHide

Approved
First Published:
2001
6.GC.05

6 : BORATES
G : Heptaborates and other megaborates
C : Tekto-dodecaborates

Pronounciation of LondoniteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of LondoniteHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
Milky white to pale yellow; yellow
Streak:
White
Hardness:
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
None
Fracture:
Conchoidal
Density:
3.34 g/cm3 (Measured)    3.42 g/cm3 (Calculated)

Optical Data of LondoniteHide

Type:
Isotropic
Type:
Isotropic

Chemical Properties of LondoniteHide

Formula:
(Cs,K,Rb)Al4Be4(B,Be)12O28
IMA Formula:
CsBe5Al4B11O28

Crystallography of LondoniteHide

Crystal System:
Isometric
Class (H-M):
4 3m - Hextetrahedral
Space Group:
P4 3m
Setting:
P4 3m
Cell Parameters:
a = 7.3205(3) Å
Unit Cell V:
392.3 ų
Z:
1
Morphology:
Dodecahedron {110}, tristetrahedron {211}, tetrahedron {111}, deltoid dodecahedron {221} and rare cube {100}

X-Ray Powder DiffractionHide

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)

Type Occurrence of LondoniteHide

General Appearance of Type Material:
Two well formed crystals 1 cm across (type locality)in saccharoidal albite.
Place of Conservation of Type Material:
In the mineralogical collection of the Museum of Natural History of Milan, Italy, number MSNM M31115.
Geological Setting of Type Material:
In the pocket zone of complex LCT pegmatite
Associated Minerals at Type Locality:

Synonyms of LondoniteHide

Other Language Names for LondoniteHide

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

Relationship of Londonite to other SpeciesHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Tourmaline17 photos of Londonite associated with Tourmaline on mindat.org.
Quartz5 photos of Londonite associated with Quartz on mindat.org.
Liddicoatite3 photos of Londonite associated with Liddicoatite on mindat.org.
Rubellite1 photo of Londonite associated with Rubellite on mindat.org.
Microcline1 photo of Londonite associated with Microcline on mindat.org.
Schiavinatoite1 photo of Londonite associated with Schiavinatoite on mindat.org.
K Feldspar1 photo of Londonite associated with K Feldspar on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

6.GC.05Rhodizite(K,Cs)Al4Be4(B,Be)12O28Iso. 4 3m : P4 3m

Fluorescence of LondoniteHide

weak yellow-green fluorescence under short-wave UV light

Other InformationHide

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 LondoniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Frondel, C., Ito, J. (1965) Composition of rhodizite. Tschermaks Mineral. Petrog. Mitt.: 10: 409–412.
Grew, E.S., Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).
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.
Mandarino, J.A. (2002) New minerals. The Canadian Mineralogist: 40: 1001-1020.
Jambor, J.L., Roberts, A.C. (2002) New mineral names. American Mineralogist: 87: 355-358.
Laurs, B.M., Pezzotta, F., Simmons, W.B., Falster, A.U., Muhlmeister, S. (2002) Rhodizite-londonite from the Antsongombato pegmatite, central Madagascar. Gems & Gemology: 38: 326-339.
Gatta, G.D., Vignola, P., McIntyre, G.J., Diella, V. (2010) On the crystal chemistry of londonite [(Cs,K,Rb)Al4Be5B11O28]: a single-crystal neutron diffraction study at 300 and 20 K. American Mineralogist: 95: 1467-1472.
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 rhodozite-londonite series. The Canadian Mineralogist: 48: 241-254.

Internet Links for LondoniteHide

Localities for LondoniteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
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. Canadian Mineralogist, 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.
      • 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]
        • Sahatany Valley
Taxer K, Buerger M J (1967) The crystal structure of rhodizite, Zeitschrift für Kristallographie, 125, 423-436
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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