Hornblende with Garneis- 3^3 dilh purple *, luftre, 1,5, fcarcely filky, with rnt- nute glittering particles ; tranfparency,o; trac- ture flaty, but does not fplit eafily into very thln’lamelke ; hardnefs, 7; fp. gr. 2,721 ; gives a purplifh grey ftreak. Hornblende Slate, penetrated with Tale or Mica. Colour, greenifh grey. Luftre, 2. Tranfparency, o. Fradture, flaty, and thin flaty, the lammte not eafily ieparable, Fragments, 3. _ Hardnefs, from 8 to 9. Sp.gr. ofthe fpeci men I tried, which had exceeding thin layers of quartzbetween its laminx, 2,815. Feels very rough. It is found in great plenty at Holyhead, and has for the moft pari thick layers ot quartz mter- cepted between its lamm*. Hornblende penetrated with Garnets. Its colour is dark greenifti red, or reddifh dark green. according to the proportion of garnet Its luftre is only derived from the garnet mixture, fraöore, e.rthy, or fine fplintery ; S[>. gr. excecds 3; if mica be fupersclacd, generally fliiftofe. Hornblende