stripes
Occurrence number:
174-00-086
Country:
United States
Region:
Colorado
Location:
Longitude: -105.48, Latitude: 38.45
Carbonatite:
No
Two breccia pipes lie 1.2 km north of Pinon Peak, northwest of Iron Mountain (No. 89). The more northerly Wood Knob pipe is only 16 m in diameter, the southerly Gar Knob pipe about 80x20 m. Both pipes are choked with fragments of the country rock granitoid gneiss which are fenitized, with the production of aegirine, crocidolite, calcite and occasional phlogopite.
References:
HEINRICH, E.W. and DAHLEM, D.H. 1967. Carbonatites and alkalic rocks of the Arkansas River area, Fremont County, Colorado. 4. The Pinon Peak breccia pipes. American Mineralogist, 52: 817-31
Map:
Fig. 1_156 The Wet Mountains alkaline province (based on Armbrustmacher, 1984a, Fig. 1 and Heinrich and Salotti, 1975, Fig. 1).
Location: