plessite

from The Century Dictionary.

• noun A name given by Reichenbach to the nickel-iron alloy which, as seen in the etched surface of a section of meteoric iron, forms a sort of ground-mass inclosed by the bands of kamacite and thin lines of tænite. See Widmannstättian figures and meteorite. Plessite is now regarded as an eutectic mixture of kamacite and tænite.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A meteorite texture consisting of a fine-grained mixture of the minerals kamacite and taenite, found in the octahedrite iron meteorites.