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Rhodizite

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Formula:
(K,Cs)Al4Be4(B,Be)12O28
System:
Isometric
Colour:
Colourless, white, ...
Lustre:
Adamantine, Vitreous
Hardness:
8
Name:
From the Greek, "rhodizein," = "to be rose-coloured" in allusion to its property of turning a blowpipe flame red. Do not confuse with Rhodesite.
The potassium analogue of Londonite. Londonite-Rhodizite Series.

First described by Rose in 1834 without quantitative chemical data. A chemical analysis was made by Damour (1882) but later showed to be uncomplete, lacking both Li and Be. The alkali metals were also not separated in the analysis. Pekov et al (2010) re-analyzed co-type specimens of rhodizite from Sarapulsk and Shaitanka, Russland and found all to be Cs-dominant (Cs > K) and thus londonite according to IMA nomenclature. No rhodizite has been verified from the co-typelocalities. K-dominant member of the londonite-rhodizite series has been noted from Madagascar.
Note: Both K-dominant and Cs-dominant samples from Madagascar prior to the description of londonite (The Cs-dominant member of the londonite-rhodizite series) by Simmons et al (2001) is described as rhodizite in the litteraure. Specimens from Madagascar without analysis should be labelled as londonite-rhodizite series.

Visit gemdat.org for gemological information about Rhodizite.

Classification of Rhodizite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
6.GC.05

6 : BORATES
G : Heptaborates and other megaborates
C : Tekto-dodecaborates
25.8.2.1

25 : ANHYDROUS BORATES CONTAINING HYDROXYL OR HALOGEN
8 : Miscellaneous
9.1.16

9 : Borates
1 : Borates of the alkalis and boric acid
mindat.org URL:
http://www.mindat.org/min-3405.html
Please feel free to link to this page.

Type Occurrence of Rhodizite

Year of Discovery:
1834
Associated Minerals at Type Locality:

Physical Properties of Rhodizite

Adamantine, Vitreous
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Colourless, white, greyish, yellowish; colourless in transmitted light
Hardness (Mohs):
8
Cleavage:
Distinct/Good
On {111} and {1¯11}, difficult.
Fracture:
Conchoidal
Density:
3.305 - 3.38 g/cm3 (Measured)    3.24 g/cm3 (Calculated)

Crystallography of Rhodizite

Crystal System:
Isometric
Class (H-M):
4 3m - Hextetrahedral
Space Group:
P4 3m
Cell Parameters:
a = 7.31Å
Unit Cell Volume:
V 390.62 ų (Calculated from Unit Cell)
Morphology:
Crystals dodecahedral, also tetrahedral. "o" usually smooth and shining and "d" frequently uneven.
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Optical Data of Rhodizite

Type:
Isotropic
Comments:
Exhibits weak anomalous double refraction distributed in sectors with Z(+) inclined about 10° to [110].

Chemical Properties of Rhodizite

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

Relationship of Rhodizite to other Species

Series:
Forms a series with Londonite (see here)
9.1.1SassoliteH3BO3
9.1.2MetaboriteHBO2
9.1.3DiomigniteLi2[B4O7]
9.1.4BiringucciteNa2B5O8(OH) · H2O
9.1.5NasiniteNa2[B5O8(OH)] · 2H2O
9.1.6KerniteNa2[B4O6(OH)2] · 3H2O
9.1.7EzcurriteNa4B10O17 · 7H2O
9.1.8TincalconiteNa2(B4O7) · 5H2O
9.1.9BoraxNa2(B4O5)(OH)4 · 8H2O
9.1.10AmeghiniteNa(H4B3O7)
9.1.11SborgiteNa[B5O6(OH)4] · 3H2O
9.1.12AristarainiteNa2MgB12O20 · 8H2O
9.1.13SantiteK[B5O6(OH)4] · 2H2O
9.1.14Larderellite(NH4)B5O7(OH)2 · H2O
9.1.15Ammonioborite(NH4)2[B5O6(OH)4]2 · H2O

Other Names for Rhodizite

Name in Other Languages:

Other Information

Electrical:
Pyroelectric.
Other Information:
Insoluble in acids.
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 Rhodizite

Reference List:
Rose, G. (1834): Über den Rhodizit, eine neue Mineralgattung. Poggendorf’s Annalen der Physik und Chemie. 33, 253-256.

Rose, G. (1835): On rhodizite, a new mineral. Gornyi Zh., kn. 2, 383-388 (in Russian)

Rose, G. (1836): Fernere Bemerkungen über den Rhodizit. Pem>Poggendorf’s Annalen der Physik und Chemie. 39, 321-323.

Ries and Rose (1843) Annalen der Physik, Halle, Leipzig: 59: 353.

Bertrand (1882) Bulletin de la Société française de Minéralogie: 5: 31, 72.

Damour, A. (1882): Sur la rhodizite. Bulletin de la Société française de Minéralogie. 5, 98-103.

Klein (1891) Neues Jahrbuch für Mineralogie, Geologie und Paleontologie, Heidelberg, Stuttgart: I: 65.

Pisani (1910) Bulletin de la Société française de Minéralogie: 33: 37.

Dupare, Wunder, and Sabot (1911) Bulletin de la Société française de Minéralogie: 34: 131.

Goldschmidt, V. (1922) Atlas der Krystallformen. 9 volumes, atlas, and text, vol. 7: 123.

Strunz (1938) Doctoral dissertation.

Strunz (1943) Naturwissenschaften: 31, No. 5.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 329-330.

American Mineralogist (1966): 51: 533-534.

Mineralogical Magazine (1986): 50: 163-172.

American Mineralogist (1987): 72: 1028.

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


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

Internet Links for Rhodizite

Specimens:
The following Rhodizite specimens are currently listed for sale on minfind.com.

Localities for Rhodizite

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.
(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
    • Analamanga Region
Arthur Thomas, Gemstones (2009), p. 48
    • Vakinankaratra Region
      • Betafo District
        • Andrembesoa Commune
          • FKT Antsentsindrano
Behier, J. (1963): Carte mineralogique de Madagascar. Archive Service Géologique Madagascar. A 1871; [Eur.J.Min 13:159-165];
Knut Edvard Larsen collection # M-505
          • Tetezantsio-Andoabatokely Pegmatite Field
Knut Edvard Larsen Collection # M-710
Knut Edv.Larsen collection / Laurs, B. M.; Pezzotta, F.; Simmons, W.; Falster, A. U & Muhlmeister, S. (2002): Rhodizite-londonite from the Antsongombato pegmatite, Central Madagascar. Gems & Mineralogy. 38 (4), 326-339
      • Sahatany Pegmatite Field (Mt Ibity area)
        • Manandona Valley
Lacroix, A. (1922): Mineralogie de Madagascar, Tome I. Géologie-Minéralogie descriptive. A.Challamel (Éditeur), Paris. 624p ; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 330; Canadian Mineralogist (2001): 39: 747-755.
Can. Min. Volume 39, Number 3, June 2001, 747-755 / Rocks & Minerals May 1999
Pezzotta F., Falster A. U., Simmons, Wm.B. & Webber, K.L. (1997): Rhodizite from Madagascar, new localities and new chemical data. Abstracts of the First International Workshop on Petrology, Milan, Italy, September 11 to 13, 1997, Mus. Storia Nat. Sc. Nat.
        • Sahatany Valley
Larsen, K. E. (2003): Mineralene i Sahatany pegmatittfelt, Madagaskar. Norsk Bergverksmuseums Skrift. 25, 5-18(in norwegian)
Lacroix, A. (1912): Sur quelques minéraux des pegmatites du Vakinankaratra (Madagascar). Bulletin de la Société française de Minéralogie, Paris 35 , 76-84
  • Fianarantsoa Province
    • Amoron'i Mania Region
      • Ambatofinandrahana District
        • Fenoarivo Commune
Behier, J. (1960): Contribution á la mineralogie de Madagascar. Annales Géologiques de Madagascar XXIX, Tananarive. p. 56
      • Ambositra District
        • Sahatsiho-Ambohimanjaka Commune
Pezzotta F., Falster A.U., Simmons W.B. & Webber K.L. (1997): Rhodizite from Madagascar, new localities and new chemical data. Abstracts of the First International Workshop on Petrology, Milan, Italy, September 11 to 13, 1997, Mus. Storia Nat. Sc. Nat.; Can. Min. Volume 39, Number 3, June 2001, 747-755:
Pezzotta F., Falster A.U., Simmons W.B. & Webber K.L. (1997): Rhodizite from Madagascar, new localities and new chemical data. Abstracts of the First International Workshop on Petrology, Milan, Italy, September 11 to 13, 1997, Mus. Storia Nat. Sc. Nat.
Madagaskar, extraLapis No. 17, pages 66-68 / Can. Min. Volume 39, Number 3, June 2001, 747-755
  • Tuléar Province (Toliara)
    • Anosy Region (Fort Dauphin Region)
      • Amboasary District
        • Tranomaro Commune
Behier, J.(1960): Contribution á la mineralogie de Madagascar. Ann.Geol. Mad. XXIX, p 56/ http://www.minsocam.org/MSA/Special/Pig/PIG_articles/Anjahamiary.pdf
Russia (TL)
 
  • Urals Region
    • Middle Urals
      • Sverdlovskaya Oblast'
        • Rezh District
          • Shaitanka District
Pekov,I. (1998): Minerals first discovered on the territory of the former Soviet Union, p. 174; 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. (1998): Minerals first discovered on the territory of the former Soviet Union, p. 174; 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
UK
 
  • England
    • Devon
      • Okehampton area (Northern Dartmoor)
http://www.mindat.org/mesg-7-92300.html; American Mineralogst 58, p 374
USA
 
  • Wisconsin
    • Florence Co.
      • Fern
Falster, A. , W.B. Simmons & P.B. Moore (1996) The mineralogy and geochemistry of the Animikie Red Ace pegmatite in Florence County, Wisconsin: Recent Research Developments in Mineralogy: 1: 7-67.
Mineral and/or Locality  
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