3*2 Siliceous Genau Jtd Family, iEgyptian Pebble. This ftone prefents various colours together in the fame fpecimen, eitherin regulär, or irregulär .concentric and alternating ftnpes, or layers, or in dots and dendritical figures. The moft ufual colours are the yellowifti, and liver brown, red- d'ifh brown, ifabella yellow, yellowifh grey, grey« ilh, or reddifh white, milk white, leek green, ? n d black; this laft only in dpts and dendritical figures. It is found in fpheroidal, or flat rounded maffes, which are inveloped in a coarfe rough cruft. 8 Its internal luftre, i. External, o. Its tranf- parency, o'. Its fraäure conchoidal. fts hardneis, 10. Its fp. gr. 2,564. Briffon. Found principally in iEgypt, fometimes in Europe, particularly in Lorraine. 3d Family. Striped Jafper. Band Jafper of Werner. This ftone alfo prefents different colours in the fame fpecimen, generallyin llreight, more rarely in curved concentric ftnpes or layers. Seldom in oblong fpots. 1 he moft ufual colours are yellowifh, or greenifh grey, ochre, anü ifabella yellow, brown- ifb