The ophiolites of the Zermatt-Saas zone are mostly ultramafic rocks with greenschist facies mineralogy : serpentinites.
32.
A band of ultramafic rocks extends for 25 km north of Litao, Taitung ( �?\ ).
33.
Native nickel has been described as serpentinite due to hydrothermal alteration of ultramafic rocks in New Caledonia and elsewhere.
34.
This ultramafic rock forms a very infertile soil which covers the flat and marshy heaths of the Goonhilly Downs.
35.
Samples of the oceanic crust and uppermost mantle from ocean basins document that ultramafic rocks there commonly contain abundant serpentine.
36.
These represent low-volume volatile melts and attain their ultramafic chemistry via a different process to typical ultramafic rocks.
37.
Often thick, magnesite-calcrete caprock, laterite and duricrust forms over ultramafic rocks in tropical and subtropical environments.
38.
Normally chromates are associated with oceanic and ultramafic rocks like serpentinites or microdioritic rocks that almost resemble amphibolites in their appearance.
39.
Native nickel-iron alloys with Ni 3 Fe to Ni 2 Fe occur as placer deposits derived from ultramafic rocks.
40.
It typically occurs as an alteration product at the contact between felsic and mafic or ultramafic rocks such as pyroxenites and dunites.
