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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, Fe2+, U4+, 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

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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.
    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
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