schisty

schist +‎ -y

schisty (comparative more schisty, superlative most schisty)

1. Containing or composed of schist; resembling schist; (of a wine) having a mineral aroma resembling that of schist
   • 1884, Reports from Her Majesty's Consuls on the Manufactures, Commerce, &c. of Their Consular Districts, Parts 1-5, Harrison & Sons, p. 114,

     The Upper Douro wine began to fetch great prices, and this was the signal for the cultivation, bit by bit, of the whole region as far as the schisty soil, which gave the good wine, reached.

   • 1938, Xavier Herbert, Capricornia, Chapter VII, p. 90,

     At times he loved it best in Wet Season — when the creeks were running and the swamps were full — when the multi-coloured schisty rocks split golden waterfalls — […]

   • 1969, Edwin S. Deflethsen, "Colonial Gravestones and Demography" reprinted in Maris A. Vinovskis (ed.), Studies in American Historical Demography: Studies in Population, p. 211,

     Black and reddish slate stones even of the seventeenth century have borne the climate well and are still easily legible, while some of the more schisty sorts of greenish slate used in Plymouth County, Massachusetts, have survived poorly and are difficult to read.

   • 2007, Tom Cannavan, wine-pages.com

     It has a gorgeous, pure, strawberry and rose-hip nose, with some plump sultana notes and a certain mineral quality that is quite schisty and earthy.