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-r \ \ F-r F.l sr zt -2&^'\ s F a cd f11 z n !i \., \- l! X n'*:B o :: A i' ii ipRX y-p€n o Eo ;;Xo m^d- I'p fl3 H-r ^ -t .E ?" X* ;?68 EEtE' ^E E'ei *?"Fn 3E !:3# ::Eei E: tIl+ p 3EaBw. ;: F'+;-- E :a'35&FO Pq n A ri q Nog-6- p{ Er g sH;oe ; F ij- { s.*i3 > L- f,--, \_/ X{ALACHITE, CHESSYLITE, CHRYSOCOLLA The specimen (A) is chrysocollawith azurite. Chrysocolla is a hydrous copper silicate, the copper accounting{or its color. Because of its extreme so{tness it is not suita}rle {or gem pulposes l)ut is important as the coloring agent in chrysocolla quartz. Another frequently encountered but soft stone is malachite, pictured at (B) and again at (C) surrounded by azurite. The specirnen of chrysocolla is from Nevada, the rnalachite from Arizona. Soecimens from the collection of Briti.lr Nluseum( NatrrralIliitory r, London. PLATEXXVI Printed in Etrgland. { TURQUOISE Turquoise embedded in matrix {rom the well known Los Cerillos, New Mexico deposit, is seen at (A), while a fashioned stone from the same location is seen at(B). Pure turquoise such as this in a deep blue is rare and highly prized in Tibet. Persian turquoise matrix is shown at (C) and a specimen from a lesser known deposit, Wadi Maghara, Arabia Petraea, is seen at (D). Specimens from the collection of British Museum (Natural History), London. PLATE XXVII Prlnted iD EDgland, ffi iiIi;iiiiiil;ig.ii{ Fiiiituiii€*ii'tu*€ $isiuiii;;giiii€ifiSifi!ii isas i9ilgi; FiiiiEiigf, jiifiiiiii i*ii iiiiiii F t U} ! l=iielii+ii;iisii*nF. p;n ^ P0! iEigti:eiiifiiii:;n i'cL ;tx SLF s;.D d6 -!, id F=r ifr*latlirii:Iilli$0a F fl "f+lr*;iit $n+Egs3+sts oD6 +50 r0x :^\o :d 6i9 7 a R P!o UO o-i l. 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