APPENDIX. I 



Hamartite. See Bastnaesite. 



259 A. Hortoxolite. G. J. Brush, Am J. Sci. II., xlviii. 17., July, 1869. 



Orthorhombic. Observed planes 0, i-i, i-2,_l-i,l-i, 1-2 and 1-4 (J. M. Blake, 1. a), i-i f\ i-2 

 =65 ; (normals) 1-4 A 8-*=77°-80°, &-* A l-2=69°-70'\ i-i A 1-2 40 3 45'. Acute bisectrix 

 perpendicular to i-i, optic axes in a plane parallel to 0, angle between axes 83°-86, measured 

 in olive oil (J. M.Blake). H. =6-5. G. =3 "91. Lustre vitreous, subresinous. Color yel- 

 low to yellowish-green, in large masses almost black. Composition R- Si, Analysis, W. G. 

 Mixter (1. c. ) : 



Si Fe Mn Mg Ca K Ign. 



f33-59 44-37 435 1668 tr. 039 026=99-64 



B. B. in the open tube and on charcoal becomes dull and magnetic. F=4, With the 

 fluxes reacts for iron and manganese. Gelatinizes with muriatic acid. 



Found in abundance at the O'Niel Mine, Orange Co., N. Y. , associated with magnetite and 

 calcite. The mineral is a member of the chrysolite group, and is intermediate between hya- 

 losiderite and fayalite. 



Hypochlorite. See Bismutoferrite. 



224 A. Ilsejia^ite. H. Hofer, Jahrb. Min., 1871, p. 566. 



Crypto-crystaliine. Color blue-black to black, on exposure becoming blue. Found imbed- 

 ded in barite. It is soluble in water, giving a deep-blue solution, and leaving a colorless resi- 

 due of barite. The solution contained on analysis chiefly a molybdate of molybdic oxyd, 

 and yielded on evaporation deep-blue crystals, which were considered to be the salt Mo + 

 4 Mo. which is also supposed to be the composition of the mineral. Ilsemannite is a product 

 of the decomposition of metallic molybdates, and occurs associated with wulf enite at Blei- 

 berg in Carinthia. 



431 A. Ivigtite. T. B. Band, Proc. Acad. Sci. Philad., 1868, 142. 



In films and seams in massive cryolite. Granular, approaching micaceous. H.=2-2'5. 

 G. —2 '05. Color pale yellowish-green to yellow (Rand). Also in gold yellow to pale green 

 radiated elastic plates imbedded in cryolite (Hagemann). Analyses : 1. T. D. Rand (1. c. ) ; 

 2. 3. G. Hagemann, Am. J. ScL, II. xlvh. 133 : 



Si 

 1. 36 49 



Si Fe 

 24 09 7-54 



Na 

 16-03 



10-27 



undet. 



K 



105 



undet. 



F 



075 



tr. 

 tr. 



H 

 3-42 



2. YeUow 40 00 



3. Green 42 "82 



38-47 

 27 03 13-06 



3-06 

 3-93 



The loss in No. 1, exclusive of fluorine, is 11-68 per cent., while the average of Nos. 2 and 

 3 gives a loss of almost 5 per cent. In the closed tube yields acid water, and B. B. accord- 

 ing to Rand fuses easily, while Hagemann states that when free from cryolite it does not 

 fuse. "With the fluxes gives iron and silica reactions. 



Found with pachnolite and cryolite in the Greenland cryolite. Hagemann's analysis of 

 the green mineral, which he considers the purest variety, gives with the alkalies of No. 2 the 

 oxygen ratio of ft. ft, Si and H of 1 : 6 : 8 : 1. Needs further investigation. 



520 A. Isoclasite. Isoklas, F. Sandberger, J. pr. Chem., II. ii. 125. 



Monoclinic. Occurring planes 7", i-l, 0. Planes dull; crystals minute (10 mm. diam.), 

 Associated with x^seudomorphic crystals 3-7 c. m. long. Habit columnar. Clinodiagonal 

 cleavage perfect. H.=1'5. G. =2 92. Lustre vitreous to pearly. Colorless to snow-white. 

 Composition : Var. 1. fresh crystals ; 2. altered mineral, by Kottnitz, 1. c. ; 



P Ca Mg Na F"e Al fi>> H ( « Ins. 



1. 29 90 49-51 — 2 06 18-53 =100 



2. 34-00 100 17.30 9 -80 0-36 24 26 9 22 0-18=96-12 



(*) at 100° C, C-) on ignition. 



The fresh crystals give the formula Ca 3 P + Ca H + 411. Analogous in composition to 

 tagilite, but c^mtaining more water. 



