File:Microcline-bearing pyroxenite (Iron Hill Carbonatite Complex, late Neoproterozoic, -570 Ma; southwestern Colorado, USA) (15024543402).jpg

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Microcline-bearing pyroxenite (a.k.a. aegirine-bearing syenite) from the Precambrian of Colorado, USA (9.3 cm across at its widest).

Southwestern Colorado’s Iron Hill Carbonatite Complex (a.k.a. Powderhorn Carbonatite Complex) has a mix of unusual intrusive igneous rocks and is known to have a relatively high concentration of scarce elements (e.g., Nb, Ti). It was intruded more than 570 million years ago, during the late Neoproterozoic. Some Early Paleozoic dikes have cut through a portion of the northern part of the complex.

Rocks reported in the Iron Hill Carbonatite Complex principally include magnesiocarbonatite, pyroxenite, nepheline syenite, ijolite, and uncompahgrite.

The Iron Hill Complex rock shown above has an unusual lithology - it's a microcline feldspar-bearing pyroxenite. The dark green component is aegirine pyroxene. The light-colored material is microcline (one of the potassium feldspar minerals).
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Source Microcline-bearing pyroxenite (Iron Hill Carbonatite Complex, late Neoproterozoic, >570 Ma; southwestern Colorado, USA)
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/15024543402 (archive). It was reviewed on 6 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

6 December 2019

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current02:11, 6 December 2019Thumbnail for version as of 02:11, 6 December 20191,212 × 670 (202 KB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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