What does Black jack mean?

Black jack meaning in General Dictionary

A name provided by English miners to sphalerite or zinc blende called additionally untrue galena See Blende

Sentence Examples with the word Black jack

Lumber and Timber Products.-The merchantable timber is mostly in that part of the state which formerly constituted Indian Territory, and consists largely of black walnut and other valuable hard woods in the bottom lands, of black jack and post oak on the uplands and of pine on the higher elevations S.

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