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Rhodesite

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About RhodesiteHide

Cecil Rhodes
Formula:
KHCa2Si8O19 · 5H2O
Colour:
White
Lustre:
Silky
Hardness:
3 - 4
Specific Gravity:
2.27 - 2.36
Crystal System:
Orthorhombic
Name:
Named after Cecil John Rhodes (1853-1902), British colonial statesman and financier of the Rhodes University, South Africa. He ran the British South Africa Company, which operated in a territory that bacame known as Rhodesia (named after him, now the countries of Zimbabwe and Zambia). He also found the De Beers diamond company. Do not confuse with Rhodizite.
Related to fivegite.


Classification of RhodesiteHide

Approved, 'Grandfathered' (first described prior to 1959)
9.EB.05

9 : SILICATES (Germanates)
E : Phyllosilicates
B : Double nets with 4- and 6-membered rings
72.5.1.1

72 : PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
5 : Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with corrugated and complex layers
14.6.7

14 : Silicates not Containing Aluminum
6 : Silicates of Ca with alkali or Mg or both

Pronounciation of RhodesiteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of RhodesiteHide

Silky
Transparency:
Transparent, Translucent
Colour:
White
Hardness:
3 - 4 on Mohs scale
Cleavage:
Distinct/Good
Good on {100}
Density:
2.27 - 2.36 g/cm3 (Measured)    2.26 g/cm3 (Calculated)

Optical Data of RhodesiteHide

Type:
Biaxial (+)
RI values:
nα = 1.501 - 1.504 nβ = 1.506 - 1.508 nγ = 1.513 - 1.518
2V:
Calculated: 68.1°
Max Birefringence:
δ = 0.012 - 0.014
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
relatively strong

Chemical Properties of RhodesiteHide

Formula:
KHCa2Si8O19 · 5H2O
Common Impurities:
Al,Fe,Mg,Na

Crystallography of RhodesiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 23.42 Å, b = 6.55 Å, c = 7.01 Å
Ratio:
a:b:c = 3.576 : 1 : 1.07
Unit Cell V:
1,075.34 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Matted silky fibers, flattened rosettes, irregular segregations, crusts.

Type Occurrence of RhodesiteHide

Other Language Names for RhodesiteHide

German:Rhodesit
Russian:Родзит
Spanish:Rhodesita

Related Minerals - Nickel-Strunz GroupingHide

9.EB.05MacdonalditeBaCa4Si16O36(OH)2 · 10H2OOrth.
9.EB.10Delhayelite(Na,K)10Ca5Al6Si32O80(Cl2,F2,SO4)3 · 18H2OOrth.
9.EB.10HydrodelhayeliteKCa2AlSi7O17(OH)2 · 6H2OOrth.
9.EB.15Monteregianite-(Y)(Na,K)6(Y,Ca)2Si16O38 · 10H2OMon. 2/m
9.EB.20CarletoniteKNa4Ca4Si8O18(CO3)4(OH,F) · H2OTet. 4/mmm (4/m 2/m 2/m) : P4/mbm

Related Minerals - Dana Grouping (8th Ed.)Hide

72.5.1.2Monteregianite-(Y)(Na,K)6(Y,Ca)2Si16O38 · 10H2OMon. 2/m
72.5.1.3MacdonalditeBaCa4Si16O36(OH)2 · 10H2OOrth.
72.5.1.4Delhayelite(Na,K)10Ca5Al6Si32O80(Cl2,F2,SO4)3 · 18H2OOrth.
72.5.1.5HydrodelhayeliteKCa2AlSi7O17(OH)2 · 6H2OOrth.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.6.1CombeiteNa4.5Ca3.5Si6O17.5(OH)0.5Trig. 3m (3 2/m) : R3m
14.6.2PectoliteNaCa2Si3O8(OH)Tric. 1 : P1
14.6.3Pectolite-M2abcNaCa2[HSi3O9]
14.6.4DenisoviteK14+x(Ca,Na,Mn,Fe)48[Si60O162]F16(Ox,OH4−x)·2H2OMon.
14.6.5TokkoiteK2Ca4[Si7O18(OH)](OH,F)Tric.
14.6.6MountainiteKNa2Ca2[Si8O19(OH)] · 6H2OMon. 2/m : P2/b
14.6.8MiseriteK1.5-x(Ca,Y,REE)5(Si6O15)(Si2O7)(OH,F)2 · yH2OTric.
14.6.9ÅkermaniteCa2Mg(Si2O7)Tet. 4 2m : P4 21m
14.6.10MonticelliteCaMgSiO4Orth.
14.6.11MerwiniteCa3Mg(SiO4)2Mon. 2/m : P21/b
14.6.12DiopsideCaMgSi2O6Mon. 2/m : B2/b
14.6.13Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2Mon. 2/m : B2/m

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 RhodesiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Mountain, E.D. (1957) Rhodesite, a new mineral from the Bultfontein mine, Kimberley. Mineralogical Magazine: 31: 607-610.
Gard, J.A., Taylor, H.F.W., Chalmers, R.A. (1957) An investigation of two new minerals: rhodesite and mountainite. Mineralogical Magazine: 31: 611-623.
Hesse, K.F., Liebau, F., Merlino, S. (1992) Crystal structure of rhodesite, HK1-xNax+2y Ca2-y(lB,3,22∞)[Si8O19]·(6-z)H2O, from three localities and its relation to other silicates with dreier double layers. Zeitschrift für Kristallographie: 199: 25-48.

Internet Links for RhodesiteHide

Localities for RhodesiteHide

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.
Austria
 
  • Styria
    • Bad Gleichenberg
      • Wilhelmsdorf
Postl, W. (1997); R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993)
    • Bad Radkersburg
      • Klöch
Taucher, J. et al. (1989)
    • Feldbach
      • Mühldorf
Postl, W. (1987); Exel, R. (1993)
Germany
 
  • Bavaria
    • Franconia
      • Maroldsweisach
Hesse K F, Liebau F, Merlino S (1992) Crystal structure of rhodesite, HK1-xNax+2y Ca2-y(lB,3,22∞)[Si8O19]·(6-z)H2O, from three localities and its relation to other silicates with dreier double layers. Zeitschrift für Kristallographie 199, 25-48; Wittern: "Mineralfundorte in Deutschland", 2001
  • Hesse
    • Vogelsberg
      • Ortenberg
  • Rhineland-Palatinate
    • Mayen
      • Ettringen
        • Bellerberg volcano
[Blass, G., Graf, H.W., Neue Mineralfunde - mineralogische Raritäten - aus der Vulkaneifel, Mineralien-Welt 7/5, 28, 1996] [A. Wittern: Mineralfundorte in Deutschland, Schweizerbart (Stuttgart), 2001]
Italy
 
  • Umbria
    • Terni Province
      • San Venanzo
Stoppa, F., Sharygin, V.V., and Cundari, A. (1997): Mineralogy and Petrology 61, 27-45.; Sharygin, V. V., Pekov, I. V., Zubkova, N. V., Khomyakov, A. P., Stoppa, F., & Pushcharovsky, D. Y. (2013). Umbrianite, K7Na2Ca2 [Al3Si10O29] F2Cl2, a new mineral species from melilitolite of the Pian di Celle volcano, Umbria, Italy. European Journal of Mineralogy, 25(4), 655-669.
South Africa (TL)
 
  • Northern Cape Province
    • Francis Baard District
      • Kimberley
        • KEM JV Mine (Kimberley Ekapa Mining Joint Venture mine; Kimberley Underground mine)
Mountain E D (1957) Rhodesite, a new mineral from the Bultfontein mine, Kimberley. Mineralogical Magazine 31, 607-610; Minerals of South Africa
Ukraine
 
  • Dnipropetrovs'k Oblast' (Dnepropetrovsk Oblast')
Baranov, P., Shevchenko, S., Heflik, W., Natkaniec-Nowak, L., & Dumanska-Slowik, M. (2009). Jaspilite—the gemstone of Ukraine. The journal of gemmology and proceedings of the Gemmological Association of Great Britain, 31(5), 163.
USA
 
  • California
    • Fresno Co.
      • Big Creek-Rush Creek District
        • Rush Creek deposit
Gunnar Färber
    • Trinity Co.
      • Klamath Mts
        • Trinity Mts
          • Halls Gulch District
            • Wildcat Peak
Sheppard, R.A. and Gude, A.J. (1969a) Rhodesite from Trinity County, California. American Mineralogist: 54: 251-255; Barnes, I., J.B. Rapp & J.R. O’Neil (1972), Metamorphic assemblages and the direction of flow of metamorphic fluids in four instances of serpentinization: Contributions to Mineralogy and Petrology: 35: 264; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 441, 442; www.mineralsocal.org.
Mineral and/or Locality  
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