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About KolbeckiteHide

Friedrich L. W. Kolbeck
ScPO4 · 2H2O
Colourless, light yellow; when impure: cyan-blue, blue-gray, apple-green
Vitreous, Pearly
3 - 5
Specific Gravity:
Crystal System:
Named in honor of Dr. Friedrich Ludwig Wilhelm Kolbeck (12 January 1860, Dresden - 6 February 1943, Freiberg), German mineralogist, Mining Academy, Freiberg, Germany.
Metavariscite Group. The P analogue of bonacinaite.

Compare also Unnamed (As-analogue of kolbeckite).

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

Classification of KolbeckiteHide

Approved, 'Grandfathered' (first described prior to 1959)

C : Phosphates without additional anions, with H2O
D : With only medium-sized cations, RO4:H2O = 1:2

4 : (AB)5(XO4)2·xH2O

19 : Phosphates
9 : Phosphates of rare earths and Sc

Physical Properties of KolbeckiteHide

Vitreous, Pearly
Colourless, light yellow; when impure: cyan-blue, blue-gray, apple-green
3 - 5 on Mohs scale
On {010}, distinct, on {100} and {001}, poor.
2.36 g/cm3 (Measured)    2.35 g/cm3 (Calculated)

Optical Data of KolbeckiteHide

Biaxial (-)
RI values:
nα = 1.572 - 1.575 nβ = 1.590 nγ = 1.598 - 1.601
Measured: 60° , Calculated: 74°
Max Birefringence:
δ = 0.026
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
r < v strong
Only in coloured material.

Chemical Properties of KolbeckiteHide

ScPO4 · 2H2O
IMA Formula:
Sc(PO4) · 2H2O

Crystallography of KolbeckiteHide

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

Type Occurrence of KolbeckiteHide

Place of Conservation of Type Material:
Mining Academy, Freiberg, Germany: #50268. U.S. National Museum of Natural History, Washington, D.C., USA: #10632.
Associated Minerals at Type Locality:

Synonyms of KolbeckiteHide

Other Language Names for KolbeckiteHide

Relationship of Kolbeckite to other SpeciesHide

Other Members of this group:
BonacinaiteSc(AsO4)·2H2OMon. 2/m
MetavarisciteAlPO4 · 2H2OMon. 2/m : P21/b
PhosphosideriteFePO4 · 2H2OMon. 2/m
UM2005-02-AsO:AlHPScSiScAsO4 · 2H2O

Common AssociatesHide

GypsumCaSO4 · 2H2O
MalhmooditeFeZr(PO4)2 · 4H2O
VarisciteAlPO4 · 2H2O
Vernadite(Mn4+,Fe3+,Ca,Na)(O,OH)2 · nH2O
WarditeNaAl3(PO4)2(OH)4 · 2H2O
Associated Minerals Based on Photo Data:
Opal4 photos of Kolbeckite associated with Opal on mindat.org.
Quartz2 photos of Kolbeckite associated with Quartz on mindat.org.
Crandallite1 photo of Kolbeckite associated with Crandallite on mindat.org.
Curite1 photo of Kolbeckite associated with Curite on mindat.org.
Torbernite1 photo of Kolbeckite associated with Torbernite on mindat.org.
Siderite1 photo of Kolbeckite associated with Siderite on mindat.org.
Chalcocite1 photo of Kolbeckite associated with Chalcocite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

8.CD.CastellaroiteMn2+3(AsO4)2·4H2OMon. 2/m
8.CD.05MetavarisciteAlPO4 · 2H2OMon. 2/m : P21/b
8.CD.05PhosphosideriteFePO4 · 2H2OMon. 2/m
8.CD.05UM2005-02-AsO:AlHPScSiScAsO4 · 2H2O
8.CD.10MansfielditeAlAsO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.CD.10ScoroditeFe3+AsO4 · 2H2OOrth. mmm (2/m 2/m 2/m)
8.CD.10StrengiteFePO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.CD.10VarisciteAlPO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.CD.10YanomamiteInAsO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.CD.15ParascoroditeFeAsO4 · 2H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mcm
8.CD.20LudlamiteFe2+3(PO4)2 · 4H2OMon. 2/m : P21/b
8.CD.25SterlinghilliteMn2+3(AsO4)2 · 3H2OTric. 1 : P1
8.CD.30RollanditeCu3(AsO4)2 · 4H2OOrth.

Related Minerals - Dana Grouping (8th Ed.)Hide · 2H2OMon. 2/m : P21/b · 2H2OMon. 2/m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

19.9.1Xenotime-(Y)Y(PO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
19.9.2Churchite-(Y)Y(PO4) · 2H2OMon. 2/m : B2/b
19.9.3Monazite-(Ce)Ce(PO4)Mon. 2/m : P21/b
19.9.6Rhabdophane-(Ce)Ce(PO4) · H2OHex. 6 2 2 : P62 2 2
19.9.7Rhabdophane-(La)La(PO4) · H2OHex. 6 2 2 : P62 2 2
19.9.8Rhabdophane-(Nd)Nd(PO4) · H2OHex. 6 2 2 : P62 2 2
19.9.9Vitusite-(Ce)Na3(Ce,La,Nd)(PO4)2Orth. mm2 : Pca21

Other InformationHide

Decomposed by acids.
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 KolbeckiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Schrauf (1879) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 3: 352 (as Eggonite).
Edelmann, F. (1926) Kolbeckit, ein neues sächsisches mineral. Jahrbuch für das Berg- und Hüttenwesen im Sachsen: 100: 73-74.
Foshag, W.F. (1928) New mineral names. American Mineralogist: 13: 592-593.
Krenner (1929) Centralblatt für Mineralogie, Geologie und Paleontologie, Stuttgart: 27 (as Sterrettite).
Thurnwald, H., Benedetti-Pichler, A.A. (1932) Gravimetric analysis of beryllium silicate rocks. Mikrochemie: 11: 200-220.
Foshag, W.F. (1934) New mineral names. American Mineralogist: 19: 35-36.
Larsen, E.S., Montgomery, A. (1940) Sterrettite, a new mineral from Fairfield, Utah. American Mineralogist: 25: 513-518 (as Sterrettite).
Bannister, F.A. (1941) The Identity of ‘Eggonite’ with Sterrettite. Mineralogical Magazine: 26: 131-133 (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., Wappner, B. (1959) New data on the hydrated scandium phosphate minerals: sterrettite, “eggonite”, and kolbeckite. Bulletin of the Geological Society of America: 70: 1648–1649 (abstract).
Fleischer, M. (1960) New mineral names. American Mineralogist: 45: 252-258.
Hey, M.H., Milton, C., Dwornik, E.J. (1982) Eggonite (kolbeckite, sterrettite), ScPO4·2H2O. Mineralogical Magazine: 46: 493-497.
Nickel, E.H., Mandarino, J.A. (1987) Procedures involving the IMA Commission on New Minerals and Mineral Names and guidelines on mineral nomenclature. American Mineralogist: 72: 1031-1042.
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.
Yang, H., Li, C., Jenkins, R.A., Downs, R.T., Costin, G. (2007) Kolbeckite, ScPO4·2H2O, isomorphous with metavariscite. Acta Crystallographica: C63: i91-i92.
Piilonen, P.C., Poirier, G., Tait, K.T. (2008) New mineral names. American Mineralogist: 93: 1686-1691.

Internet Links for KolbeckiteHide

Localities for KolbeckiteHide

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.
  • New South Wales
    • Northumberland Co.
      • Woy Woy
        • 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.
  • 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
  • Karlovy Vary Region
    • Sokolov District
      • Horní Slavkov
        • Krásno (Schönfeld)
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 District
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)
DR Congo
  • Haut-Katanga
    • Kambove District
      • Shinkolobwe
Mineralogical Record: 20: 287-288.
  • Viti Levu
    • Tavua Gold Field
      • Vatukoula
Birch, W. D. (2015): A note on kolbeckite from the Emperor mine, Viti Levu, Fiji. Australian Journal of Mineralogy, 17, 91-93.; Museum Victoria (Australia) collection, no. M40094
  • Bavaria
    • Upper Palatinate
      • Pleystein
DILL, H.G., MELCHER, F., GERDES, A. and WEBER, B. (2008): The origin and zoning of hypogene and supergene Fe-Mn-Mg-Sc-U-REE-Zn phosphate mineralization from the newly discovered Trutzhofmühle aplite (Hagendorf pegmatite province, Germany). Canadian Mineralogist 46, 1131-1157.; Dill, H. G., Melcher, F., Gerdes, A., & Weber, B. (2008). The origin and zoning of hypogene and supergene Fe–Mn–Mg–Sc–U–REE phosphate mineralization from the newly discovered Trutzhofmühle aplite, Hagendorf pegmatite province, Germany. The Canadian Mineralogist, 46(5), 1131-1157.
      • 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.; Dill, H.G. (2009) The Hagendorf-Pleystein phosphate pegmatites (NE Bavaria, Germany) - A mineralogical, chronological and sedimentological overview. Estudos Geológicos: 19(2): 117-120.
  • Hesse
    • Wiesbaden
      • Medenbach
  • Rhineland-Palatinate
    • Altenkirchen
      • Betzdorf-Gebhardshain
        • Schutzbach
    • Neuwied
      • Dernbach
Belendorff, K. (2012) Neuigkeiten von der Grube Schöne Aussicht bei Dernbach. Mineralienwelt, 23(5), 28-37.
  • Saxony
    • Erzgebirge District
      • 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; Frank Zschäbitz, Walter Hajek, Roland Stenzel (2011): Neufunde von Kolbeckit, Hübnerit und Roscherit aus Sadisdorf, Sachsen. Lapis, 36 (7-8), 37-39.
  • Piedmont
    • Cuneo Province
      • Roburent
        • San Giacomo
          • I Cardin
Palenzona, A. (1993): La kolbeckite di Bric Colmè, CN. Riv. Mineral. Ital., 16, 3 (3-1993), 188-189.
  • Sardinia
    • Cagliari metropolitan city (Metropolitan City of Cagliari)
      • Sarroch
Orlandi P., Gelosa M., Bonacina E., Caboni F., Mamberti M., Tanca G.A., Vinci A. (2015): Sette nuove specie mineralogiche della Sardegna. I minerali della mineralizzazione a molibdeno e bismuto di Su Seinargiu (CA). Riv. Mineral. Ital., 39, 2, 84-115.
  • Kagoshima
    • Satsumasendai City
Takahiro Tanaka, Masato Nagahara, Haruo Takahashi, Masahiro Hashimoto, Takashi Yamada, Ritsuro Miyawaki, Koichi Momma, Masako Shigeoka, Akiko Tokumoto, Satoshi Matsubara (2015) Sc phosphate minerals in hydrothermal quartz veins from Satsumasendai City, Kagoshima Prefecture, Japan.
(specimens widely distributed in japanese collections since 2015)
  • Kwale County
Liferovich, R.P., Subbotin, V.V., Pakhomovsky, Y.A., Lyalina, M.F. (1998) A new type of scandium mineralization in phoscorites and carbonatites of the Kovdor Massif, Russia. The Canadian Mineralogist, 36, 971-980.
  • Guarda
    • Gouveia
      • Folgosinho
Alves, P (2016). Folgosinho: Fosfatos secundarios de la mina Sitio do Castelo. Revista de Minerales 2015/2, 6-27. (in Spanish).
  • Covasna
Fehér, B., Szakáll, S. & Zajzon, N. (2012): Kolbeckite from Bixad, Romania: The first authentic occurrence in the Carpathians. Acta Mineralogica-Petrographica, Abstract Series, 7, 43.
  • Maramureș
    • Baia Sprie (Felsőbánya)
1-Rădulescu Dan, Dimitrescu Radu, 1966, Mineralogia Topografică a României, Ed. Academiei RSR, 1966, p.322-323.
  • Primorsky Krai
    • Arminsky ore district
POPOV, V. A. & POPOVA, V. I. (1992): Kolbeckite ScPO4.2H2O. First Discovery in Russia. Dokl. Akad. Nauk SSSR 322, 963-965. (in Russian).
  • Arkansas
    • Garland Co.
      • Wilson Springs (Potash Sulfur Springs)
        • Union Carbide Mine
Rocks & Minerals (1995): 70(3): 154-170.
    • Hot Spring Co.
      • Magnet Cove
Min News (1998) 14:4 pp 1,2,5; Henry Barwood - unpublished (2010)
Rocks & Min.: 63:109.
  • Utah
    • Utah Co.
      • Oquirrh Mts
        • Fairfield
Liferovich, R.P., Subbotin, V.V., Pakhomovsky, Y.A., Lyalina, M.F. (1998) A new type of scandium mineralization in phoscorites and carbonatites of the Kovdor Massif, Russia. The Canadian Mineralogist, 36, 971-980.;
Rocks & Minerals (1970): 45(11): 667-674.;Wilson, W. (2010): The Clay Canyon Variscite Mine, Fairfield Utah. Mineralogical Record. 41:321-349.
  • Wisconsin
    • Rusk Co.
      • Ladysmith-Rhinelander Metavolcanic Complex
        • Ladysmith
Jones, C., J. Jones & G. LaBerge, G. (1999) The Flambeau Mine, Ladysmith, Wisconsin. Mineralogical Record, 30 (2), 107-131
Mineral and/or Locality  
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