The schists are about 1.45 billion years old and contain garnet + staurolite + sillmanite + muscovite + biotite + plagioclase + quartz. The staurolite occurs as porphyroblasts up to a centimeter in size. Stop 4 of Daniel et al.
References
Page 221 - Daniel, C. G. et al., 2016, Regional Al2SiO5 triple-point metamorphic rocks of northern New Mexico: A field trip to honor the career contributions of Lincoln Hollister to petrology and tectonics: Geol. Soc. Am. Field Guide 44, p. 201- 229.
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