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Roedderite

Big Photo

Caspar quarry, Ettringer Bellerberg Mt. (Bellberg Mt.; Bellenberg Mt.; Billenberg Mt.; Boilenberg Mt.), Bellerberg volcano, Ettringen, Mayen, Eifel Mts, Rhineland-Palatinate, Germany
© Fred Kruijen

Show Roedderite Photos (33)
Formula:
(Na,K)
 
2
(Mg,Fe)
 
5
Si
 
12
O
 
30
System:HexagonalColour:Colourless to dark blue
Hardness:5 - 6
Name:Named after Edwin Woods Roedder, geologist.


Osumilite Group. Eifelite-Roedderite Series.

Compare also almarudite and friedrichbeckeite.

Classification of Roedderite

IMA status:Approved
Strunz 8th edition ID:8/E.22-40
Nickel-Strunz 10th (pending) edition ID:9.CM.05

9 : SILICATES (Germanates)
C : Cyclosilicates
M : [Si6O18]12- 6-membered double rings (sechser-Doppelringe)
Dana 8th edition ID:63.2.1a.14

63 : CYCLOSILICATES Condensed Rings
2 : Condensed Rings (Milarite - Osumilite group)
Hey's CIM Ref.:14.24.4

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

Type Locality:Indarch meteorite (Elizabethpol; Gindorcha; Glindorcha; Indarh; Indarkh; Schuscha; Suscha [NHM cat.]), Shusha, Naxçıvan (Naxcivan; Nakhichevan) District, Azerbaijan
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
Maximum Birefringence:δ = 0.005

Chart 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)
 
5
Si
 
12
O
 
30
Essential elements:Mg, Na, O, Si
All elements listed in formula:Fe, K, Mg, Na, O, Si
Common Impurities:Ti,Al,Mn

Relationship of Roedderite to other Species

Series:Forms a series with Eifelite (see here)
Related Minerals - Nickel-Strunz Grouping):

- +
9.CM.05Armenite
BaCa
 
2
Al
 
6
Si
 
9
O
 
30
·2H
 
2
O
9.CM.05Brannockite
(K,Na)Li
 
3
Sn
 
2
Si
 
12
O
 
30
9.CM.05Chayesite
K(Mg,Fe)
 
4
FeSi
 
12
O
 
30
9.CM.05Darapiosite
KNa
 
2
Li(Mn,Zn)
 
2
ZrSi
 
12
O
 
30
9.CM.05Eifelite
KNa
 
3
Mg
 
4
Si
 
12
O
 
30
9.CM.05Merrihueite
(K,Na)
 
2
(Fe,Mg)
 
5
Si
 
12
O
 
30
9.CM.05Milarite
K
 
2
Ca
 
4
Al
 
2
Be
 
4
Si
 
24
O
 
60
·H
 
2
O
9.CM.05Osumilite-(Mg)
(K,Na)(Mg,Fe)
 
2
(Al,Fe)
 
3
(Si,Al)
 
12
O
 
30
·H
 
2
O
9.CM.05Osumilite
(K,Na)(Fe
2+
 
,Mg)
 
2
(Al,Fe
3+
 
)
 
3
(Si,Al)
 
12
O
 
30
9.CM.05Poudretteite
KNa
 
2
B
 
3
Si
 
12
O
 
30
9.CM.05Sogdianite
(K,Na)
 
2
(Li,Fe)
 
3
(Zr,Ti,Fe)Si
 
12
O
 
30
9.CM.05Sugilite
KNa
 
2
(Fe,Mn,Al)
 
2
Li
 
3
Si
 
12
O
 
30
9.CM.05Yagiite
(Na,K)
 
3
Mg
 
4
(Al,Mg)
 
6
(Si,Al)
 
24
O
 
60
9.CM.05Berezanskite
KLi
 
3
Ti
 
2
Si
 
12
O
 
30
9.CM.05Dusmatovite
K(K,Na,[ ])(Mn
2+
 
,Y,Zr)
 
2
(Zn,Li)
 
3
Si
 
12
O
 
30
9.CM.05Shibkovite
K(Ca,Mn,Na)
 
2
(K
 
2-x
,□
 
x
)
 
2
Zn
 
3
Si
 
12
O
 
30
9.CM.05Almarudite
K([],Na)
 
2
(Mn
2+
 
,Fe
2+
 
,Mg)
 
2
(Be,Al)
 
3
[Si
 
12
O
 
30
]
9.CM.05Trattnerite
([],K)(Mg, Fe
2+
 
)
 
3
Fe
3+
2
[Si
 
12
O
 
30
]
9.CM.05Oftedalite
(Sc,Ca,Mn
2+
 
)
 
2
K[(Be,Al)
 
3
Si
 
12
O
 
30
]
9.CM.10Faizievite
K
 
2
Na(Ca
 
6
Na)Ti
 
4
Li
 
6
[F
 
2
|Si
 
24
O
 
66
]
Related Minerals - Hey's Index Grouping:

- +
14.24.1Magnesioriebeckite
[ ][Na
 
2
][Mg
 
3
Fe
3+
2
][(OH)
 
2
|Si
 
8
O
 
22
]
14.24.2Magnesio-arfvedsonite
[Na][Na
 
2
][Mg
 
4
Fe
3+
 
][(OH)
 
2
|Si
 
8
O
 
22
]
14.24.3Celadonite
K(Mg,Fe
2+
 
)(Fe
3+
 
,Al)[(OH)
 
2
|Si
 
4
O
 
10
]
14.24.5Merrihueite
(K,Na)
 
2
(Fe,Mg)
 
5
Si
 
12
O
 
30
14.24.6Chayesite
K(Mg,Fe)
 
4
FeSi
 
12
O
 
30

Other Names for Roedderite

Synonyms:
IMA1965-023
Other Languages:
German:Roedderit
Russian:Реддерит
Spanish:Roedderita

Other Information

Health Warning: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

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  • Raman and XRD data at RRUFF project
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    Localities for Roedderite

    Hide Locality List
    The 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. ? 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 Radkersburg
        • Klöch
    		Lapis 2003(1), 7-8
    Azerbaijan
     
    • Naxçıvan (Naxcivan; Nakhichevan) District
      • 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
    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.
    France
     
    • Auvergne
      • Haute-Loire
        • Le Puy-en-Velay
          • Espaly-Saint-Marcel
    		Lapis 2003(1), 8
        • Solignac-sur-Loire
          • Le Brignon
    		P & E Médard collection
    Germany
     
    • Rhineland-Palatinate
      • Eifel Mts
        • Andernach
          • Eich
    		Hentschel, G., Die Mineralien der Eifelvulkane, Weise Verlag München, 1983
        • 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
              • Ettringer Bellerberg Mt. (Bellberg Mt.; Bellenberg Mt.; Billenberg Mt.; Boilenberg Mt.)
    		[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
     
    • Nansei Archipelago
      • Kagoshima Prefecture
    		www5b.biglobe.ne.jp/~mineral/roedderite2.htm. ; Forrest Cureton specimens.
    Spain
     
    • Castile-La Mancha
      • Albacete
        • Cancarix
    		E. Salvioli-mariani et al. , Eur. J. Mineral. , 1996, 8, pp. 1027-1039.
    Sudan
     
    • Kassala
      • 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
     
    • South Yemen
    		LPSC 26,659(1995); Zolensky, M. & A.Ivanov, Chemie der Erde 63,185-246(2003)
    Mineral and/or Locality
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