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Helmut Rager
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Journal Article

Ti(III) in Msynthetic pyrope : A single-crystal electron paramagnetic resonance study

Helmut RAGER, Charles A. GEIGER, Andreas STAHL
Published: 01 July 2003
European Journal of Mineralogy (2003) 15 (4): 697–699.
DOI: https://doi.org/10.1127/0935-1221/2003/0015-0697
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Spectroscopic study of natural gem quality “Imperial”-Topazes from Ouro Preto, Brazil

Stefanie SCHOTT, Helmut RAGER, Kay SCHÜRMANN, Michail TARAN
Published: 01 July 2003
European Journal of Mineralogy (2003) 15 (4): 701–706.
DOI: https://doi.org/10.1127/0935-1221/2003/0015-0701
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Colour, crystal chemistry, and mineral association of a green sphalerite from Steinperf, Dill Syncline, FRG

Helmut Rager, Georg Amthauer, Manfred Bernroider, Kay Schurmann
Published: 01 October 1996
European Journal of Mineralogy (1996) 8 (5): 1191–1198.
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Ti (super 3+) centres in mullite

Helmut Rager, Hartmut Schneider, Abbas Bakhshandeh
Published: 01 June 1993
European Journal of Mineralogy (1993) 5 (3): 511–514.
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Crystal-field spectroscopic study of Cr-doped mullite

Ko Ikeda, Hartmut Schneider, Masahide Akasaka, Helmut Rager
Published: 01 April 1992
American Mineralogist (1992) 77 (3-4): 251–257.
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