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Roedderite

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Formula:
(Na,K)2(Mg,Fe)5Si12O30
System:
Hexagonal
Colour:
Colourless to dark blue
Hardness:
5 - 6
Member of:
Name:
Named after Edwin Woods Roedder, geologist.

Classification of Roedderite

Approved
9.CM.05

9 : SILICATES (Germanates)
C : Cyclosilicates
M : [Si6O18]12- 6-membered double rings (sechser-Doppelringe)
63.2.1a.14

63 : CYCLOSILICATES Condensed Rings
2 : Condensed Rings (Milarite - Osumilite group)
14.24.4

14 : Silicates not Containing Aluminum
24 : Silicates of Fe, Mg and alkalis
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Type Occurrence of Roedderite

Year of Discovery:
1966

Physical Properties of Roedderite

Colour:
Colourless to dark blue
Hardness (Mohs):
5 - 6

Crystallography of Roedderite

Crystal System:
Hexagonal
Cell Parameters:
a = 10.13Å, c = 14.26Å
Ratio:
a:c = 1 : 1.408
Unit Cell Volume:
V 1,267.27 ų (Calculated from Unit Cell)

Optical Data of Roedderite

Type:
Uniaxial (+)
RI values:
nω = 1.537 nε = 1.542
Max Birefringence:
δ = 0.005
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Low

Chemical Properties of Roedderite

Formula:
(Na,K)2(Mg,Fe)5Si12O30
Essential elements:
All elements listed in formula:
Common Impurities:
Ti,Al,Mn

Relationship of Roedderite to other Species

Series:
Forms a series with Eifelite (see here)
Member of:
Other Members of Group:
Agakhanovite-(Y)(YCa)□2KBe3Si12O30
AlmaruditeK(□,Na)2(Mn2+,Fe2+,Mg)2(Be,Al)3[Si12O30]
ArmeniteBaCa2Al6Si9O30 · 2H2O
BerezanskiteK□2Li3(Ti,Zr,Sn)2[Si12O30]
Brannockite(K,Na)□2Li3(Sn,Zr,Ti)2[Si12O30]
DarapiositeKNa2(Zn,Li)3(Mn,Zr)2[Si12O30]
DusmatoviteK(Na,□)2(Zn,Li)3(Mn2+,Y,Zr)2[Si12O30]
EifeliteKNa3Mg4Si12O30
FriedrichbeckeiteK(□0.5Na0.5)2Mg2Be3Si12O30
Klöchite(□Na)KFe22+Zn3(Si12O30)
Merrihueite(K,Na)2(Fe,Mg)5Si12O30
MilariteK2Ca4Al2Be4Si24O60 · H2O
Osumilite(K,Na)(Fe2+,Mg)2(Al,Fe3+)3(Si,Al)12O30
Osumilite-(Mg)KMg2Al3(Al2Si10)O30
PoudretteiteKNa2B3Si12O30
ShibkoviteK(□,K,Na)2Zn3Ca2[Si12O30]
SogdianiteK(□,Na)2Li3(Zr,Fe,Ti)2[Si12O30]
SugiliteK(Na,□)2Li3(Fe,Mn,Al,Zr)2[Si12O30]
Trattnerite□(Fe3+,Mg,Fe2+)2(Mg,Fe2+,Fe3+)3(Si12O30)
Yagiite(Na,K)3Mg4(Al,Mg)6(Si,Al)24O60
9.CM.05ArmeniteBaCa2Al6Si9O30 · 2H2O
9.CM.05Brannockite(K,Na)□2Li3(Sn,Zr,Ti)2[Si12O30]
9.CM.05ChayesiteK(Mg,Fe)4FeSi12O30
9.CM.05DarapiositeKNa2(Zn,Li)3(Mn,Zr)2[Si12O30]
9.CM.05EifeliteKNa3Mg4Si12O30
9.CM.05Merrihueite(K,Na)2(Fe,Mg)5Si12O30
9.CM.05MilariteK2Ca4Al2Be4Si24O60 · H2O
9.CM.05Osumilite-(Mg)KMg2Al3(Al2Si10)O30
9.CM.05Osumilite(K,Na)(Fe2+,Mg)2(Al,Fe3+)3(Si,Al)12O30
9.CM.05PoudretteiteKNa2B3Si12O30
9.CM.05SogdianiteK(□,Na)2Li3(Zr,Fe,Ti)2[Si12O30]
9.CM.05SugiliteK(Na,□)2Li3(Fe,Mn,Al,Zr)2[Si12O30]
9.CM.05Yagiite(Na,K)3Mg4(Al,Mg)6(Si,Al)24O60
9.CM.05BerezanskiteK□2Li3(Ti,Zr,Sn)2[Si12O30]
9.CM.05DusmatoviteK(Na,□)2(Zn,Li)3(Mn2+,Y,Zr)2[Si12O30]
9.CM.05ShibkoviteK(□,K,Na)2Zn3Ca2[Si12O30]
9.CM.05AlmaruditeK(□,Na)2(Mn2+,Fe2+,Mg)2(Be,Al)3[Si12O30]
9.CM.05Trattnerite□(Fe3+,Mg,Fe2+)2(Mg,Fe2+,Fe3+)3(Si12O30)
9.CM.05OftedaliteK(Sc,Ca,Mn2+)22[(Be,Al)3Si12O30]
9.CM.10FaizieviteK2Na(Ca6Na)Ti4Li6[F2|Si24O66]
14.24.1Magnesio-riebeckite◻{Na2}{Mg3Fe23+}(Si8O22)(OH)2
14.24.2Magnesio-arfvedsonite{Na}{Na2}{Mg4Fe3+}(Si8O22)(OH)2
14.24.3CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
14.24.5Merrihueite(K,Na)2(Fe,Mg)5Si12O30
14.24.6ChayesiteK(Mg,Fe)4FeSi12O30

Other Names for Roedderite

Name in Other Languages:
German:Roedderit
Japanese:レダー石
Simplified Chinese:罗镁大隅石
Spanish:Roedderita

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 Roedderite

Reference List:
American Mineralogist (1966): 51: 949-955.

Hentschel, G., Abraham, K. u. Schreyer. W., (1980): First Terrestrial Occurrence of Roedderite in Volcanic Ejecta of the Eifel, Germany: Contr. Mineral. Petrol.: 73, 127-130.

Armbruster, T. (1989): Crystal chemistry of double-ring silicates: structure of Roedderite at 100 and 300 K, European Journal of Mineralogy, Vol. 1, 715-718

Mineralogical Magazine (1994): 58: 655.

Internet Links for Roedderite

Localities for Roedderite

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.
Antarctica
 
  • Eastern Antarctica
    • Queen Maud Land (Dronning Maud Land)
      • Queen Fabiola Mts (Yamato Mts)
Brearley, A. J. & Jones, R. H. (1998): Chondritic Meteorites. In: Planetary Materials (Papike, J. J., Editor): Chapter 3, 398 pages. Mineralogical Society of America: Washington, DC, USA. (1998)
Austria
 
  • Styria
    • Bad Radkersburg
      • Klöch
Lapis 2003(1), 7-8
Azerbaijan (TL)
 
  • Naxçıvan District (Naxcivan; Nakhichevan)
    • Shusha
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow; American Mineralogist, Volume 93, pages 902–909, 2008; Brearley, A. J. & Jones, R. H. (1998): Chondritic Meteorites. In: Planetary Materials (Papike, J. J., Editor): Chapter 3, 398 pages. Mineralogical Society of America: Washington, DC, USA. (1998)
China
 
  • Anhui Province
    • Bozhou Prefecture
      • Qiaocheng District
        • Xiaoyanzhuang
http://www.lpi.usra.edu/meetings/LPSC99/pdf/1774.pdf / Lunar and Planetary Science XXX, J. C. Bridges et al.
  • Guizhou Province
    • Guiyang Prefecture
      • Qingzhen Co.
Hsu, W. (1998). Geochemical and petrographic studies of oldhamite, diopside, and roedderite in enstatite meteorites: Meteoritics & Planetary Science 33 (2): 291-301. (March 1998).; Rambaldi, E. R., Rajan, R. S. & Housley, R. M. (1986) Roedderite in the Qingzhen (EH3) chondrite: Meteoritics 21(1): 141-149. (March 1986)
France
 
  • Auvergne
    • Haute-Loire
      • Le Puy-en-Velay
        • Espaly-Saint-Marcel
Barrier D, Pourtier G, Médard P (2004) Minéralogie du mont Denise (Haute-Loire). Le Cahier des Micromonteurs 83: 3-11.
      • Solignac-sur-Loire
        • Le Brignon
P & E Médard collection
    • Puy-de-Dôme
      • Rochefort-Montagne
        • Perpezat
Valverde, J. (2009): Prospection dans la carrière du puy de Vivanson, Perpezat, Puy-de-Dôme. Le Cahier des Micromonteurs, 106, 30-31.
Germany
 
  • Rhineland-Palatinate
    • Eifel
      • Andernach
        • Nickenich
Hentschel, G., Die Mineralien der Eifelvulkane, Weise Verlag München, 1983
Hand Egon Künzel, Günter Blaß, Willi Schüller (2011) Mineralien - Bomben - Grottensteine: Der Nickenicher Weinberg. Lapis, 36, #7-8, 55-66
      • Daun
        • Oberstadtfeld
Leu, K., Der Vulkanabbau "Auf´m Kopp" bei Oberstadtfeld in der Westeifel, Lapis 2/1995
        • Üdersdorf
Künzel, E., Roedderit vom Emmelberg / Eifel, Lapis 3/1986
      • Kelberg
        • Drees
Schüller, W., Die Mineralien des Niveligsberges bei Drees in der Eifel, Der Aufschluß SB 33, 1990
      • Mayen
        • Ettringen
          • Bellerberg volcano
[Hentschel, G., Abraham, K., Schreyer, W. , Roedderit und Osumilith aus dem Laacher Vulkangebiet, Fortschr. Mineral. 55, Beih. 1, 43-44, 1977] [Lapis 2003(1), 7]
      • Polch
        • Ochtendung
Lapis 1988(7+8), 70-72
Hungary
 
  • Szabolcs-Szatmár-Bereg Co.
    • Tarpa
Szakáll-Gatter-Szendrei: Mineral Species of Hungary, 2006
India
 
  • Uttar Pradesh
    • Basti Division
      • Basti District
        • Gorakhpur
Lunar and Planetary Science XXXII (2001)
Japan
 
  • Kyushu Region
    • Nansei Archipelago
      • Kagoshima Prefecture
        • Mishima village
Kanehara, Hiroshi Shigeno, Koji Ono, Kimio Okumura, Keiji (1976), Roedderite of altered volcanic rocks of Satsuma Iwo Jima; www5b.biglobe.ne.jp/~mineral/roedderite2.htm. ; Forrest Cureton specimens.
Kanehara, Hiroshi Shigeno, Koji Ono, Kimio Okumura, Keiji (1976), Roedderite of altered volcanic rocks of Satsuma Iwo Jima; www5b.biglobe.ne.jp/~mineral/roedderite2.htm. ; Forrest Cureton specimens.
Malawi
 
Brearley, A. J. & Jones, R. H. (1998): Chondritic Meteorites. In: Planetary Materials (Papike, J. J., Editor): Chapter 3, 398 pages. Mineralogical Society of America: Washington, DC, USA. (1998)
Spain
 
  • Castile-La Mancha
    • Albacete
      • Hellín
        • Cancarix
E. Salvioli-mariani et al. , Eur. J. Mineral. , 1996, 8, pp. 1027-1039.
Sudan
 
  • Kassala Wilayah
    • Gash delta
www.meteoritestudies.com/protected_MAYO-BEL.HTM
USA
 
  • Arizona
    • Coconino Co.
      • Winslow
        • Meteor Crater and vicinity
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 171-172, 356; Olsen, E. & L. Fuchs (1968), Krinovite, NaMg2CrSi3O10 = a new meteorite mineral, Science 161: 786-787
  • Texas
    • Wichita Co.
http://rruff.geo.arizona.edu/doclib/hom/roedderite.pdf.
Yemen
 
  • Hadramawt Governorate
LPSC 26,659(1995); Zolensky, M. & A.Ivanov, Chemie der Erde 63,185-246(2003)
Mineral and/or Locality  
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