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Kolbeckite

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Schlarbaum quarry, Klause, Bad Gleichenberg, Styria, Austria
© Stephan Wolfsried

Show Kolbeckite Photos (22)
Formula:
ScPO
 
4
·2H
 
2
O
System:MonoclinicColour:Colourless, light ...
Hardness:3 - 5
Name:After Dr. Friedrich Ludwig Wilhelm Kolbeck (1860-1943), German mineralogist, Mining Academy, Freiberg, Germany.


Compare also Unnamed (As-analogue of kolbeckite).

A very rare secondary mineral in phosphate deposits and some hydrothermal veins.

Classification of Kolbeckite

IMA status:Approved
Strunz 8th edition ID:7/C.09-30
Strunz 9th edition ID:8.CD.05
Nickel-Strunz 10th (pending) edition ID:8.CD.05

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
D : With only medium-sized cations, RO4:H2O = 1:2
Dana 8th edition ID:40.4.3.3

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
4 : (AB)5(XO4)2·xH2O
Hey's CIM Ref.:19.9.13

19 : Phosphates
9 : Phosphates of rare earths and Sc
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Type Occurrence of Kolbeckite

Type Locality:Sadisdorf, Schmiedeberg, Erzgebirge, Saxony, Germany
Place of Conservation of Type Material:Mining Academy, Freiberg, Germany: #50268. U.S. National Museum of Natural History, Washington, D.C., USA: #10632.
Year of Discovery:1926
Associated Minerals at type locality:
QuartzChlorite Group

Occurrences of Kolbeckite

Geological Setting:Phosphate deposits; some hydrothermal metallic veins.

Physical Properties of Kolbeckite

Lustre:Vitreous, Pearly
Diaphaneity (Transparency):Transparent
Colour:Colourless, light yellow; when impure: cyan-blue, blue-gray, apple-green
Hardness (Mohs):3 - 5
Tenacity:Brittle
Cleavage:Distinct/Good
On {010}, distinct, on {100} and {001}, poor.
Fracture:Conchoidal
Density (measured):2.36 g/cm3
Density (calculated):2.35 g/cm3

Crystallography of Kolbeckite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Cell Parameters:a = 5.442Å, b = 10.2513Å, c = 8.9094Å
β = 90.253°
Ratio:a:b:c = 0.531 : 1 : 0.869
Unit Cell Volume:V 497.03 ų (Calculated from Unit Cell)
Z:4
Morphology:Crystals commonly short prismatic [001], with prominent {110}, {011}, and less prominent {010}, {101}, and {130}. Platy crystals in radiating aggregates less common.
Twinning:On {100}, common. May exhibit diagonal sutures on {001}.
Comment:Pseudo-orthorhombic; Space group: P21/n

Optical Data of Kolbeckite

Type:Biaxial (-)
RI values: nα = 1.572 - 1.575 nβ = 1.590 nγ = 1.598 - 1.601
2V:Measured: 60° , Calculated: 74°
Maximum Birefringence:δ = 0.026

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r < v strong
Pleochroism:Strong
Comments:Only in coloured material.

Chemical Properties of Kolbeckite

Formula:
ScPO
 
4
·2H
 
2
O
Essential elements:H, O, P, Sc
All elements listed in formula:H, O, P, Sc

Relationship of Kolbeckite to other Species

Common Associates:
WarditeVernaditeVarisciteMalhmooditeLithiophorite
GypsumCrandallite
Related Minerals - Nickel-Strunz Grouping):

- +
8.CD.05Metavariscite
AlPO
 
4
·2H
 
2
O
8.CD.05Phosphosiderite
FePO
 
4
·2H
 
2
O
8.CD.10Mansfieldite
AlAsO
 
4
·2H
 
2
O
8.CD.10Scorodite
Fe
3+
 
AsO
 
4
·2H
 
2
O
8.CD.10Strengite
FePO
 
4
·2H
 
2
O
8.CD.10Variscite
AlPO
 
4
·2H
 
2
O
8.CD.10Yanomamite
InAsO
 
4
·2H
 
2
O
8.CD.15Parascorodite
Fe
3+
 
AsO
 
4
·2H
 
2
O
8.CD.20Ludlamite
(Fe,Mn,Mg)
 
3
(PO
 
4
)
 
2
·4H
 
2
O
8.CD.25Sterlinghillite
Mn
 
3
(AsO
 
4
)
 
2
·4H
 
2
O
8.CD.30Rollandite
Cu
 
3
(AsO
 
4
)
 
2
·4H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
19.9.1Xenotime-(Y)
YPO
 
4
19.9.2Churchite-(Y)
YPO
 
4
·2H
 
2
O
19.9.3Monazite-(Ce)
(Ce,La,Nd,Th)PO
 
4
19.9.4Monazite-(La)
(La,Ce,Nd)PO
 
4
19.9.5Monazite-(Nd)
(Nd,La,Ce)PO
 
4
19.9.6Rhabdophane-(Ce)
(Ce,La)PO
 
4
·H
 
2
O
19.9.7Rhabdophane-(La)
(La,Ce)PO
 
4
·H
 
2
O
19.9.8Rhabdophane-(Nd)
(Nd,Ce,La)PO
 
4
·H
 
2
O
19.9.9Vitusite-(Ce)
Na
 
3
(Ce,La,Nd)(PO
 
4
)
 
2
19.9.10Florencite-(Ce)
CeAl
 
3
[(OH)
 
6
|(PO
 
4
)
 
2
]
19.9.11Florencite-(La)
LaAl
 
3
[(OH)
 
6
|(PO
 
4
)
 
2
]
19.9.12Florencite-(Nd)
NdAl
 
3
[(OH)
 
6
|(PO
 
4
)
 
2
]

Other Names for Kolbeckite

Synonyms:
EggoniteSterrettite
Other Languages:
German:Eggonit
Kolbeckit
Russian:Кольбекит
Spanish:Eggonita
Kolbeckita

Other Information

Other Information:Decomposed by acids.
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 Kolbeckite

Reference List:Schrauf (1879) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 3: 352 (as Eggonite).

Edelmann (1926) Berg.- und hüttenmännisches Sachsen, Jahrbuch: 100: 74A.

Krenner (1929) Centralblatt für Mineralogie, Geologie und Paleontologie, Stuttgart: 27 (as Sterrettite).

Thurnwald and Benedetti-Pichler (1932) Mikrochem.: 11: 200.

American Mineralogist (1940): 25: 513.
Larsen, E.S. and Arthur Montgomery (1940) American Mineralogist: 25: 513 (as Sterrettite).

Bannister (1941) Mineralogical Magazine: 26:131 (as Sterrettite).

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, 1124 pp.: 965-966 (as Sterrettite), 1015-1016 (as Kolbeckite).

Mrose, M.E. and B. Wappner (1959) New data on the hydrated scandium phosphate minerals: sterrettite, “eggonite”, and kolbeckite. Bulletin of the Geological Society of America: 70: 1648–1649 (abstract).

American Mineralogist (1960): 45: 257.

Hey, M.H., C. Milton, and E.J. Dwornik (1982) Eggonite (kolbeckite, sterrettite), ScPO4 •2H2O. Mineralogical Magazine: 46: 493.

Doklady Akademii Nauk SSSR (1992): 322: 1963.

Bull, I., Young, V., Teat, S. J., Peng, L., Grey, C. P. & Parise, J. B. (2003): Hydrothermal Synthesis and structural characterization of four scandium phosphate frameworks. Chemistry of Materials 15, 3818-3825.

Articles/Blogs about Kolbeckite

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    Localities for Kolbeckite

    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.
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    (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.
    Australia
     
    • New South Wales
      • Northumberland Co.
        • Gosford
          • Woy Woy Peninsula
    		ENGLAND, B. M. & TURNER, K. E. (1988): An Occurrence of Kolbeckite (Eggonite) ScPO4.2H2O from the Central Coast, New South Wales, Australia. Austral. Mineral. 3(4), 151-156.
    Austria
     
    • Styria
      • Bad Gleichenberg
        • Klause
    		Postl, W. (1981): Kolbeckite, a rare hydrated scandium phosphate from a Klause quarry near Gleichenberg, Styria, Austria. Mitteilungsbl. - Abt. Mineral. Landesmus. Joanneum 49, 301-307. (in German); R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993)
    Czech Republic
     
    • Bohemia (Böhmen; Boehmen)
      • Karlovy Vary Region
        • Horní Slavkov (Schlaggenwald)
          • Krásno
    		Sejkora, J., Škoda, R., Ondruš, P., Beran, P. & Susser, C. (2006): Mineralogy of phosphate accumulations in the Huber stock, Krásno ore district, Slavkovský les area, Czech Republic. Journal of the Czech Geological Society 51, 103-147.
            • Vysoký Kámen
    		Sejkora, J., Ondruš, P., Fikar, M., Veselovský, F., Mach, Z. & Gabašová, A. (2006): New data on mineralogy of the Vysoký Kámen deposits near Krásno, Slavkovský les area, Czech Republic. Journal of the Czech Geological Society 51, 43-55.
      • Plzeň Region
        • Rokycany (Rokitzan; Rokytzan)
    		Janouš, F.: Minerály z Kněží hory u Těškova (okres Rokycany), Minerál, 1995, roč. 3, č. 6, s. 367-369; Lehrieder, E. and Cerný, P. (1999): Der Steinbruch am Hügel Knezský bei Teskov in Böhmen/Tschechien. Aufschluss 50, 79-95. (in German)
    Democratic Republic of Congo (Zaïre)
     
    • Katanga (Shaba)
      • Katanga Copper Crescent
        • Central area
          • Shinkolobwe
    		Mineralogical Record: 20: 287-288.
    Fiji
     
    • Viti Levu
      • Tavua Gold Field
        • Vatukoula
    		Museum Victoria (Australia) collection, no. M40094
    Germany
     
    • Bavaria
      • Upper Palatinate
        • Oberpfälzer Wald
          • Vohenstrauß
            • Waidhaus
    		Dill, H.G., Weber, B., Füssl, M., Melcher, F. (2006): The origin of the hydrous scandium phosphate, kolbeckite, from the Hagendorf-Pleystein pegmatite province, Germany. Mineralogical Magazine, 70, 281-290.
    • Rhineland-Palatinate
      • Siegerland
        • Betzdorf
          • Schutzbach
    • Saxony
      • Erzgebirge
        • Schmiedeberg
    		F. Edelmann (1926): Kolbeckit, ein neues sächsisches Mineral.- Jahrbuch für das Berg- u. Hüttenwesen in Sachsen 100, A73-A74; 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: 1016.
    Italy
     
    • Piedmont
      • Cuneo Province
        • San Giacomo
          • I Cardin
    		PALENZONA, A. (1993): La kolbeckite di Bric Colmè, CN. Riv. Mineral. Ital., (3), 188-189.
    Russia
     
    • Far-Eastern Region
      • Primorskiy Kray
        • Sikhote-Alin
    		POPOV, V. A. & POPOVA, V. I. (1992): Kolbeckite ScPO4.2H2O. First Discovery in Russia. Dokl. Akad. Nauk SSSR 322, 963-965. (in Russian).
    USA
     
    • Arkansas
      • Garland Co.
        • Wilson Springs (Potash Sulfur Springs)
          • Union Carbide Mine
    		Rocks & Minerals (1995): 70(3): 154-170.
      • Hot Spring Co.
        • Magnet Cove
    Rocks & Min.: 63:109.
    • Utah
      • Utah Co.
        • Oquirrh Mts
          • Fairfield
            • Clay Canyon
    		Rocks & Minerals (1970): 45(11): 667-674.
    • Wisconsin
      • Rusk Co.
        • Ladysmith
    		[MinRecord 30:114]
    Mineral and/or Locality
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