Transactions . i herb Sphalerite Layer-Cake Ore from the Little Eock Mine on Hall Mountain. (Natural size. Fig. 14. « *• —*- -4 A r. SpJialerite Altered Siliceous Eock with Sphalerite and Quartz. (Two-thirds natural size.) irregular in form and direction, and may be either large orsmall, rich or poor. It sometimes happens that these old water-ways have followed certain structural features, such as syn- f>82 THE ZINC- ani» LEAD-DEPOSITS F n<»i:tii akkansas. clina] folds, guided apparently by 11 m- impervious character,ofadjacent beds and by the porous or open nature of the conduct*

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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries