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Rhodesite

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Cecil Rhodes
Formula:
KHCa2Si8O19 · 5H2O
System:
Orthorhombic
Colour:
White
Hardness:
3 - 4
Name:
Named after Cecil John Rhodes (1853-1902), British colonial statesman and financier and the Rhodes University, South Africa. Do not confuse with Rhodizite.
Related to fivegite.

Classification of Rhodesite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
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
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Type Occurrence of Rhodesite

Year of Discovery:
1957

Occurrences of Rhodesite

Geological Setting:
Kimberlite, altered silicic lavas

Physical Properties of Rhodesite

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

Crystallography of Rhodesite

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

Optical Data of Rhodesite

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 Rhodesite

Formula:
KHCa2Si8O19 · 5H2O
Essential elements:
All elements listed in formula:
Common Impurities:
Al,Fe,Mg,Na

Relationship of Rhodesite to other Species

9.EB.05MacdonalditeBaCa4Si16O36(OH)2 · 10H2O
9.EB.10Delhayelite(Na,K)10Ca5Al6Si32O80(Cl2,F2,SO4)3 · 18H2O
9.EB.10HydrodelhayeliteKCa2AlSi7O17(OH)2 · 6H2O
9.EB.15Monteregianite-(Y)(Na,K)6(Y,Ca)2Si16O38 · 10H2O
9.EB.20CarletoniteKNa4Ca4Si8O18(CO3)4(OH,F) · H2O
14.6.1CombeiteNa2Ca2(Si6O18)0.5
14.6.2PectoliteNaCa2(HSi3O9)
14.6.3Pectolite-M2abcNaCa2[HSi3O9]
14.6.4DenisoviteCa2(K,Na)Si3O8(F,OH)2
14.6.5TokkoiteK2Ca4Si7O17(O,OH,F)4
14.6.6MountainiteKNa2Ca2[Si8O19(OH)] · 6H2O
14.6.8MiseriteK1.5-x(Ca,Y,REE)5(Si6O15)(Si2O7)(OH,F)2 · yH2O
14.6.9ÅkermaniteCa2Mg(Si2O7)
14.6.10MonticelliteCaMgSiO4
14.6.11MerwiniteCa3Mg(SiO4)2
14.6.12DiopsideCaMgSi2O6
14.6.13Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2

Other Names for Rhodesite

Name in Other Languages:
German:Rhodesit
Russian:Родзит
Spanish:Rhodesita

Other Information

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 Rhodesite

Reference List:
American Mineralogist (1958): 43: 624.

American Mineralogist (1992): 77: 1308.

Zeitschrift für Kristallographie (1992): 199: 25-48.

Internet Links for Rhodesite

Localities for Rhodesite

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.
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
Wittern: "Mineralfundorte in Deutschland", 2001
  • Hesse
    • Vogelsberg
      • Ortenberg
  • Rhineland-Palatinate
    • Eifel
      • 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.
South Africa (TL)
 
  • Free State Province
    • Lejweleputswa District
Min.Soc. Notice no.95 (1956), and Min.Mag.(1957) 31, 607-610
  • Northern Cape Province
    • Francis Baard District
      • Kimberley
Minerals of South Africa
USA
 
  • California
    • 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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