Buddingtonite, ammonium feldspar, in the Phosphoria Formation, southeastern Idaho

Journal of Research of the U.S. Geological Survey
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Abstract

Buddingtonite is distributed widely in the rocks of the Meade Peak Member of the Phosphoria Formation in southeastern Idaho and occurs in amounts up to about 50 percent. Most of the buddingtonite is in the middle mudstone interval of the member between two phosphate-rich intervals. The composition of the buddingtonite, in terms of a buddingtonite K-feldspar series, shows an apparent range of Bd82KF18 to Bd13KF87, and compositions of Bd72KF28 to Bd50KF50 may be the most common. The predominant silicate mineral suite consists of buddingtonite-albite-illite. Albite is present in amounts up to about 20 percent. Buddingtonite may have developed directly from volcanic glass in the presence of abundant ammonium, derived from the decomposition of organic matter, in interstitial waters, or it may have formed at some later diagenetic stage from other products of volcanic glass alteration, such as montmorillonite or zeolites.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Buddingtonite, ammonium feldspar, in the Phosphoria Formation, southeastern Idaho
Series title Journal of Research of the U.S. Geological Survey
Volume 2
Issue 6
Year Published 1974
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Description 4 p.
First page 693
Last page 696
Country United States
State Idaho
Other Geospatial Meade Peak
Online Only (Y/N) N
Additional Online Files (Y/N) N
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