| Reference Type | Journal (article/letter/editorial) |
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| Title | Zoned hibonites from Punalur, South India |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Santosh, M. | Author |
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| Sandiford, M. | Author |
| Reed, S. J. B. | Author |
| Year | 1991 (June) | Volume | 55 |
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| Issue | 379 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_55/55-379-159.pdf+ |
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| DOI | doi:10.1180/minmag.1991.055.379.02Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 1710 | Long-form Identifier | mindat:1:5:1710:1 |
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| GUID | 0 |
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| Full Reference | Santosh, M., Sandiford, M., Reed, S. J. B. (1991) Zoned hibonites from Punalur, South India. Mineralogical Magazine, 55 (379) 159-162 doi:10.1180/minmag.1991.055.379.02 |
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| Plain Text | Santosh, M., Sandiford, M., Reed, S. J. B. (1991) Zoned hibonites from Punalur, South India. Mineralogical Magazine, 55 (379) 159-162 doi:10.1180/minmag.1991.055.379.02 |
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| In | (1991, June) Mineralogical Magazine Vol. 55 (379) Mineralogical Society |
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| Abstract/Notes | AbstractZoned hibonites from a kalsilite, leucite, spinel, corundum, perovskite gneiss from the southern Indian granulite terrain near Punalur, Kerala, have rims that are the most Ti-rich yet recorded (0.83–0.87 Ti atoms per 19 O) and are essentially free of REE elements (ΣREE < 0.01 atoms per 19 O) while the cores are the most REE-rich compositions yet recorded (ΣREE = 0.55–0.65 atoms per 19 O). Within the limits of analytical uncertainty, the compositions of the hibonite can be related to the theoretical end-member CaAl12O19 by the substitutions REE R2+ ⇌ CaAl and R2+R4+ ⇌ Al2 with the REE-rich cores containing in excess of 50% of the REE R2+ Al11O19 end member. Minor substitution of Na for Ca occurs in the rims, while non-stoichiometry in both the cores and rims is indicated by partial 12-fold site occupancy. Ion-microprobe analysis of the REE-rich hibonites reveals strong enrichment in LREE with La/Lu c. 250 000. |
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