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SS-3674-6

Abstract

This porphyritic sample contains phenocrysts of augite, olivine, and pseudoleucite. Olivine has an iddingsite rim when in contact with the groundmass. The pseudoleucite phenocrysts are a colorless and cloudy, roundish eight-sided crystals with first-order grey birefringence and extinction occurs in amoeboid-shaped sections within the phenocryst. These same pseudoleucite crystals make up the majority of the groundmass, along with calcite, k-feldspar and other alteration products. Three copies of this thin section contain the contact zone itself, with a calcite and clay-rich, layered Eagle sandstone.

Note

The author has given permission for this work to be deposited in the Digital Archive of Colorado College.

Administrative Notes

The author has given permission for this work to be deposited in the Digital Archive of Colorado College.

Copyright
Copyright restrictions apply.
Publisher
None
PID
coccc:19403