4145 x 2862 px | 35,1 x 24,2 cm | 13,8 x 9,5 inches | 300dpi
Aufnahmedatum:
2. März 2006
Weitere Informationen:
Orthogneiss, Bisti Badlands, New Mexico A gneiss with mineralogy and texture indicating derivation from a phaneritic igneous rock protolith. Typically consists of abundant feldspar, with quartz, and variable hornblende, biotite, and muscovite, with a relatively homogeneous character. Gneiss nearly always shows a banded texture characterized by alternating darker and lighter colored bands and without a distinct cleavage. Gneisses are common in the ancient crust of continental shields. Some of the oldest rocks on Earth are gneisses, such as the Acasta Gneiss.
