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Hjelmite

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Nya Kårarvet, Kårarvet (Kararfvet; Korarfvet), Falun, Dalarna, Sweden
© 2008 Jesse Crawford

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Colour:BlackHardness:5
Name:After the Swedish chemist P.J. Hjelm (1746-1813).


Inadequately described/studied.
A doubtful species possibly related to tapiolite or samarskite.
An oxide or niobate-tantalate containing Y, Fe 2+, U 4+, Sn, Mn, Ca, Nb, Ta.

Classification of Hjelmite

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Physical Properties of Hjelmite

Lustre:Metallic
Colour:Black
Streak:Grayish black
Hardness (Mohs):5
Fracture:Irregular/Uneven
Density (measured):5.2 - 5.8 g/cm3

Crystallography of Hjelmite

Morphology:Rough and indistinct crystals. Massive; rounded or prismatic aggregates.

Optical Data of Hjelmite

Type:Anisotropic

Other Names for Hjelmite

Synonyms:
Hielmite
Other Languages:

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 Hjelmite

Reference List:Nordenskiöld (1860), Ak. Stockholm, Öfv.: 17: 34.

Nordenskiöld (1860), Ann. Phys.: 111: 279, 286.

Nordenskiöld (1860), Journal pr. Chem.: 81: 202.

Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 779-780.

Internet Links for Hjelmite

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    Localities for Hjelmite

    (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.
    Sweden
     
    • Dalarna
      • Falun
        • Kårarvet (Kararfvet; Korarfvet)
    		Nordenskjöld, A.E. (1860): Beitrag zur Kenntnis von in Schweden vorkommenden Yttrotantal- und Yttroniob-Mineralien, Annalen der Physik und Chemie, Vol. 187(111), 278ff
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 1st Nov 2009 14:02:31