( 5 1 9 ) C EIGHTH SPECIES* Schaalftone. S chaal ftein.—Werner. External Characters. Its mod common colour is greyifh white, which fometimes paffes into greenifh and yellowifh white, and reddifh white. Occurs maflive. The luftre of its principal figure is fhining and nearly pearly. Principal frafture foliated, with a flight tendency fplintery, and coarfe fibrous. Cleavage Angle, and rather imperfect. Occurs in ftraight and thin lamellar diflinft concre- tions, which are colleaed into other large and broad Prifmatic diftinft concretions, that pafs into long and coarfe grained concretions, dhe pofltion of the con- cretions is promifcuous. I ' Tranflucent. Semihard in a pretty high degree. Brittle. • ‘ ( 3X2 Ea %