Skip to main content Accessibility help
×
Home

Uvarovite* and grossular from the Fengtien nephrite deposits, eastern Taiwan

  • Hsien-Ming Wan (a1) and Chun-Lu Yeh

Abstract

Uvarovite and grossular, the former comparatively rare, occur along the serpentinite-graphite schist contact in the Fengtien area, on the eastern slope of the Central Range of Taiwan. Uvarovite occurs as small emerald-green euhedral crystals on diopside-fels with dodecahedral crystal forms and many other modifications. Its refractive index is 1.782, specific gravity 3.702, and unit cell edge 11.912 Å. Chemical and probe analyses give average Cr2O3 contents of 11.60 wt. %; spectrographic analysis shows significant enrichment in Cr, Be, Co, Y, Sb, and La over grossular. Associated minerals include nephrite, diopside, tremolite asbestos, zoisite, and clinozoisite. Grossular is reddish-brown; large crystals, dodecahedral in form often modified by trapezohedrons, are associated with diopside, idocrase, and calcite. n = 1.746, SG = 3.636, and a = 11.866 Å. Structurally and chemically it is quite near the grossular end member. Grossular is considered to be formed from pneumatolysis associated with the intrusion of ultramafic rocks, whereas uvarovite is a replacement product of relict chromite in the original ultramafic rocks where migration of elements such as silicon and calcium from wall rocks are prominent.

Copyright

Footnotes

Hide All
*

See note on p. 37.

Footnotes

References

Hide All
Chakraborty, K. L. (1968) Am. Mineral. 53, 962–5.
Deer, W. A., Howie, R. A., and Zussman, J. (1963) Rock Forming Minerals, 1. John Wiley, New York, 104.
Frankel, J. J. (1959) Am. Mineral. 44, 565–91.
Ho, C. S. (1975) An Introduction to the Geology of Taiwan. Ministry of Economic Affairs, Republic of China.
Huang, C. K. (1969) Ada Geol. Taiwanica. 13, 1–7.
Huang, C. K. and Yeh, C. L. (1978) Gemmological Soc. Japan. 5, 13–20.
Lee, W. C., and Yui, T. F. (1980) Proc. Geol. Soc. China. 23, 76–91.
Lee, W. C., Tien, L. P., and Yui, T. F. (1978) NSC Special Publication, no. 1, 4269.
Medlin, J. H., Suhr, N. H., and Bodkin, J. B. (1969) Atomic Absorption Newsletter. 8, 25–9.
Skinner, B. J. (1956) Am. Mineral. 41, 428–36.
Tan, L. P., Lee, W. C., and Tien, P. L. (1978) NSC Special Publication, no. 1, 128.
Tan, L. P., Chen, S. J., and Lo, T. W. (1981) Proc. Nat. Sci. Council R0C(A). 5, 173–80.
von Knorring, O. (1951) Mineral. Mag. 29, 594–601.
Winchell, H. (1958) Am. Mineral. 43, 595–600.
Yen, T. P. (1954) Bull. Geol. Surv. Taiwan. 7, 1–46.
Yui, T. F., and Lee, W. C. (1980) Pro. Geol. Soc. China, 23, 92104.

Uvarovite* and grossular from the Fengtien nephrite deposits, eastern Taiwan

  • Hsien-Ming Wan (a1) and Chun-Lu Yeh

Metrics

Altmetric attention score

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed