Letter | Published:

Nordstrandite from Guam

Naturevolume 196pages265266 (1962) | Download Citation

Subjects

Abstract

NORDSTRANDITE (Al2O3·3H2O), previously reported only as a synthetic product1,2, occurs in Miocene limestone on Guam. In south Guam this limestone forms a cap several hundred feet thick, on the Mount Alifan–Mount Lamlan ridge, and overlies late Eocene and early Miocene basalt flows and volcanic conglomerates. The volcanic rocks below the limestone are deeply weathered. The nordstrandite occurs in secondary solution cavities and is concentrated mainly in the basal part of the limestone near its contact with the weathered basalt. In thin section the nordstrandite crystals are seen as flamboyant aggregates reaching lengths of as much as 0.4 mm. The optical properties of the mineral are as follows: The hardness is about 3 and the specific gravity was determined by Edward J. Young to be 2.436.

Access optionsAccess options

Rent or Buy article

Get time limited or full article access on ReadCube.

from$8.99

All prices are NET prices.

References

  1. 1

    Nordstrand, R. A. van, Hettinger, W. P., and Keith, C. D., Nature, 177, 713 (1956).

  2. 2

    Papée, D., Tertian, R., and Biais, R., Bull. Soc. chim. France, 1301 (1958).

Download references

Author information

Affiliations

  1. U.S. Geological Survey, Denver, Colorado

    • JOHN C. HATHAWAY
  2. U.S. Geological Survey, Berea, Kentucky

    • SEYMOUR O. SCHLANGER

Authors

  1. Search for JOHN C. HATHAWAY in:

  2. Search for SEYMOUR O. SCHLANGER in:

About this article

Publication history

Issue Date

DOI

https://doi.org/10.1038/196265a0

Comments

By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.