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Kolbeckite

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Formula:
ScPO4 · 2H2O
System:
Monoclinic
Colour:
Colourless, light ...
Hardness:
3 - 5
Name:
After Dr. Friedrich Ludwig Wilhelm Kolbeck (1860-1943), German mineralogist, Mining Academy, Freiberg, Germany.
Metavariscite Group.

Compare also Unnamed (As-analogue of kolbeckite).

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

Classification of Kolbeckite

Approved
8.CD.05

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

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
4 : (AB)5(XO4)2·xH2O
19.9.13

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

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:

Occurrences of Kolbeckite

Geological Setting:
Phosphate deposits; some hydrothermal metallic veins.

Physical Properties of Kolbeckite

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:
2.36 g/cm3 (Measured)    2.35 g/cm3 (Calculated)

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°
Max Birefringence:
δ = 0.026
Image 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:
ScPO4 · 2H2O
Essential elements:
All elements listed in formula:

Relationship of Kolbeckite to other Species

Other Members of Group:
MetavarisciteAlPO4 · 2H2O
PhosphosideriteFePO4 · 2H2O
UM2005-02-AsO:AlHPScSiScAsO4 · 2H2O
8.CD.05MetavarisciteAlPO4 · 2H2O
8.CD.05PhosphosideriteFePO4 · 2H2O
8.CD.05UM2005-02-AsO:AlHPScSiScAsO4 · 2H2O
8.CD.10MansfielditeAlAsO4 · 2H2O
8.CD.10ScoroditeFe3+AsO4 · 2H2O
8.CD.10StrengiteFePO4 · 2H2O
8.CD.10VarisciteAlPO4 · 2H2O
8.CD.10YanomamiteInAsO4 · 2H2O
8.CD.15ParascoroditeFeAsO4 · 2H2O
8.CD.20Ludlamite(Fe,Mn,Mg)3(PO4)2 · 4H2O
8.CD.25SterlinghilliteMn3(AsO4)2 · 4H2O
8.CD.30RollanditeCu3(AsO4)2 · 4H2O
19.9.1Xenotime-(Y)Y(PO4)
19.9.2Churchite-(Y)Y(PO4) · 2H2O
19.9.3Monazite-(Ce)(Ce,La,Nd,Th)(PO4)
19.9.4Monazite-(La)(La,Ce,Nd)(PO4)
19.9.5Monazite-(Nd)(Nd,La,Ce)(PO4)
19.9.6Rhabdophane-(Ce)(Ce,La)(PO4) · H2O
19.9.7Rhabdophane-(La)(La,Ce)(PO4) · H2O
19.9.8Rhabdophane-(Nd)(Nd,Ce,La)(PO4) · H2O
19.9.9Vitusite-(Ce)Na3(Ce,La,Nd)(PO4)2
19.9.10Florencite-(Ce)CeAl3(PO4)2(OH)6
19.9.11Florencite-(La)LaAl3(PO4)2(OH)6
19.9.12Florencite-(Nd)NdAl3(PO4)2(OH)6

Other Names for Kolbeckite

Name in Other Languages:

Other Information

Other Information:
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 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.

Internet Links for Kolbeckite

Localities for Kolbeckite

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.
Australia
 
  • 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.
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 (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 (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
      • Shinkolobwe
Mineralogical Record: 20: 287-288.
Fiji
 
  • Viti Levu
    • Tavua Gold Field
      • Vatukoula
Museum Victoria (Australia) collection, no. M40094
Germany
 
  • 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.
      • 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.
  • Hesse
    • Wiesbaden
      • Medenbach
http://www.mineralienatlas.de/lexikon/index.php/Deutschland/Hessen/Wiesbaden/Medenbach/Schulwaldtunnel
  • Rhineland-Palatinate
    • Siegerland
      • Betzdorf
        • Schutzbach
    • Westerwald
      • Wied Iron Spar District
        • Neuwied
          • Dernbach
Belendorff, K. (2012) Neuigkeiten von der Grube Schöne Aussicht bei Dernbach. Mineralienwelt, 23(5), 28-37.
  • 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; Frank Zschäbitz, Walter Hajek, Roland Stenzel (2011): Neufunde von Kolbeckit, Hübnerit und Roscherit aus Sadisdorf, Sachsen. Lapis, 36 (7-8), 37-39.
Italy
 
  • Piedmont
    • Cuneo Province
      • Roburent
        • San Giacomo
          • I Cardin
PALENZONA, A. (1993): La kolbeckite di Bric Colmè, CN. Riv. Mineral. Ital., (3), 188-189.
  • Sardinia
    • Cagliari Province
      • 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.
Kenya
 
  • Coast Province
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.
Romania
 
  • Covasna Co.
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 Co.
    • Baia Sprie (Felsöbánya)
1-Rădulescu Dan, Dimitrescu Radu, 1966, Mineralogia Topografică a României, Ed. Academiei RSR, 1966, p.322-323.
Russia
 
  • Far-Eastern Region
    • Primorskiy Kray
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
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
Jones, C., J. Jones & G. LaBerge, G. (1999) The Flambeau Mine, Ladysmith, Wisconsin. Mineralogical Record, 30 (2), 107-131
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