COLLECTIONS IN KCOXO.MIC UKOLOOV AM) METALf.lJRcJY. 209 



(J, Piii>or, four spocimons. (r»0H4'i.) 

 C-M Mill ho.ml.or Ihit pjickiiij;. S«>vt>ii 



Hpftiinons, Diio-Miirty-Hueotiil to 



i)iu?-half iiicli thick. (r>(W:w. ) 

 (:n IMstoii packiu;;. luiiiid. SevtMi speo 



inu'iis, (r)0841.) 

 (1) Wick pack injf. (50814.) 

 (."O (fiiskots, four .spwiinoiiM. (.')08:<1>.) 

 (f.) Asliestosaml nililxT stcuni packiu;;, 



nix 8p«>ciiinMis. (.")08-IO.) 

 (7) Biiililiiij,' felt. (r>08r>5.) 

 (H) Kootiii-,' f.'lt. (50852.) 

 (:•) Slioiithiii;,'. (5084.3.) 



(10) Tiircad. (5084;>.) 



(11) Til read. (50848.) 

 {1-2) Yarn. (50847.) 

 (i:i) Twine. (.50846.) 

 (14) Coril. (.50845.) 



Products. 

 (1.5) 



( If.) 

 (17) 



(m 

 (i<t) 



(20) 

 (21) 



(22) 

 (23) 

 (24) 



Cord, H<ift, dyed Mcvoral culorH. 



(508;{r>. ) 

 Print rolliii- clotli. (.'i08."»3. ) 

 Clotli, for tlirat**r mrtaiiiM. i.fc. 



(50851.) 

 liocomotive laKKii'K. ii'>nr.iiidii,;(. 



iii^. (.508:{5. ) 

 iiiiiiiijj ffdt. II o II CO lid II I- I i II jr. 



(508:{7. ) 

 La<j<r«»j;. :»ir chamber. ii..ni-..iidiict- 



iug. (.50850.) 



Noncondiiotiii;; cover for stoaiii 



pipes, boilers, etc. (50854.) 

 Retort cement. (50858.) 

 Plastic stove liniiij,'. (.50857.) 

 Cement feltiiij;, for covering steam 

 pipes, boilers, etc. (50856.) 



I' II OS I' II A r KS. 

 I'liosiMiATK Mineral. 



Al'ATITE. 



Compo.<^itions: 3Ca3 P.O» + Cad, or 3Ca3P20„4- CaF^. Phosphate 

 of lime, with chloride or fluoride of calcium, contaiiiiii'; phosphoric 

 acid 41 to 42.2.1 per cent., lime 53.8 to o5.55 per cent., aiwl chlorine (J.S2 

 per cent, or liiiorine 3.77 per cent., chlorine and tiuorine nuitnally re- 

 placing; each other. 



It crystallizes in the hexa^'onal .system, showing especially prismatic 

 and pyramidal planes, crystals often hein;,' hi«;hly modified. It also 

 occurs (il)roiis, (columnar, and granular massive. It varies in hardness 

 from 4..-. to.-, Mild in speciHc gravity from 2.1)2 to 3.25. The common 

 color is some shade of green, l.iit many colors are found, and occasion- 

 ally it is white. It is triinsparantto opa(pie ami has a vitreous luster. 



Apatite is the chief constitiitent of nearly all the native phosphates 

 which occur in sumcient amounts to i.e mined for their phosporic acid. 

 A single spe.-imen of crystallized apatite is shown hrn- ; others will be 

 found with the phosphate ores. 



(1) Crystal. Teiiiplelon, r,ii,;,da. ( f.Ci.'w-i. ) 



I'iKisniA IK ()Ki;s. 



It is somewhat di'Hcult to classify the native phosphates, since the 

 several varieties gra<luate into each other and ilem-nd for the most 

 pJirl upon the physical condition and purify .if the material. Mineral 

 pliosphat.'s are generally cpiit^. pure, while rock phosphates are impure 

 and run down t.. vety low percentages of i)liosphate, as in the case of 

 iti 10— Nu. JL' II 



