Document Yrr63Dx9zGep6xxK8xXpmqqvE

c. c uood commercially but In i-.iidi smaller amounts. Chryaotilo ocouro as veins In aorperitlno, a wlnornl of similar chomLoal composition ,Tihioh oriota in massive form and is made up of mioroocopio fibern without tho porallol orientation charactorlotio of chryaotilo. Tho masolvo bluish* black serpentine, which is smooth and soapy to tho touoh, is traversed by volnn of fibrous chryaotilo varying in width from a baroly perooptible lino to six or noro inchos. The fibers run aoroas tho vein and not longthwino with tho formation. Attention is directod to the mineral brucite, HgO.l^O, which is often found in tho sn;.to formations with sorpontine and chrysotile jjnd may be fibrous in structure. Exoopt for the manufacture of magnesium, brucite has no commercial value at proaont because its fibers aro not suffioiontly flexible to be uood in tortilos, but they are capable of repoatod longi tudinal subdivioion. Unlike othor sebostiform minerals, brucite la not a silicate and for this reason it has been a valuable tool in an exporimontal evaluation of the aotion of fibrous minerals upon lung tissue. EXPERT HE II TAL ASBESTOSIS oratory in an investigation of the cause, nature and development of asbestocis. Tho prccont papor is devoted.to exporimontal ashontocic nnd in it 1.' Cardnor, L.K. ond Cummings, D.E.i Studios on Experimental Pnoumoconloals. VI. Inhalation of Asbestos Dust. J. Indust. llyg. 13 66, 97, 1931. Z. Gardner, L.U.x Chryootllo Aobeotos as an Indicator of Subtile Dif ferences in Animal Tissues. Am. Rev. Tuboro. 46i 7G2, 1942. -2-