METEORITES OF NORTH AMERICA. 447 



remained. After removing all the large schreibersite crystals, tenite foliae, and jagged pieces, there remained a non- 

 magnetic residue of 0.6031 grams, and magnetic particles weighing 1.9S64 grams. Of the latter, 0.9099 gram were dis- 

 solved in copper ammonium chloride which showed that three parts consisted of jagged pieces and one part of tenite. 

 The remaining 1.0765 grams consisted of grains and flakes of normal schreibersite mixed with long needles of rhabdite. 

 The composition of the plate investigated was thus, as follows: 



Gr. Per cent. 



Soluble nickel iron 284. 5920 95. 05 



Tsenite 7.3428 2.45 



Schreibersite and rhabdite 3. 5072 1. 17 



Jagged pieces 2.9256 .98 



Nonmagnetic residue 6031] 



Slime 4493) 



299. 4200 100. 00 



The nonmagnetic residue, composed of pieces of rust, carbon, and mineral grains, was treated with hydrochloric 

 acid, heated, and again digested with hydrochloric acid. There remained after this treatment 0.0162 gram of grains 

 and small crystals. 



The collected solutions were next employed to determine the copper contained in the iron. This gave a value of 

 0.0113 per cent. Further qualitative testing of the hydrogen sulphide precipitate indicated an absence of tin and 

 antimony. Finally a part of the solution containing 13.281 grams of nickel iron was tested for manganese with nega- 

 tive result. 



Tamite. — This forms fine, isolated, very thin foliae between 0.03 and 0.25 mm. in thickness. Many show a rhom- 

 bic form with an angle of about 120°, and are in part broad (10 by 7 mm.) and in part small (12.5 by 3 mm.). The 

 largest are in general also the thickest, though among the thinnest plates many are large. A second kind of appear- 

 ance originates through the uniting of many folia 1 in parallel pieces into bundles with thin plates of kamacite between; 

 the latter being often only very slowly dissolved. Such bundles are, however, not so abundant nor so thick as they 

 are, for example, in Glorieta Mountain. The lamellae are abundant, though toothed into one another, so that after 

 solution and separation they appear with small jagged edges and show toothed forms like many ilmenites. Frequently 

 angular pieces project into the foliae and their fine points bore through them like a needle, leaving a hole after solu- 

 tion. The color is tin-white passing to silver white and resembles closely that of pure quicksilver. They easily tar- 

 nish, however, to a brass or golden yellow. If by careful treatment with alcohol and ether and immediate drying 

 they are secured completely fresh, they seem to resist very strongly the influence of the atmosphere. The tenite is 

 flexible and at times somewhat elastic, especially in the thicker pieces. In order to determine the solubility the 

 tenite was treated for 38 days with cold dilute hydrochloric acid. The result was as follows: 



Per cent. 



1 HC1+5 aq 79. 36 



1 HC1+10 aq 68. 13 



1 HC1+20 aq 65. 33 



As the same material was employed in all three experiments above, it is possible that the plates if once attacked 

 are less resistant, so that in more dilute solutions the solubility may be less than indicated above; also the acid acts 

 for a short time only with its original concentration in the above experiments, since the easily soluble kamacite was 

 quickly dissolved. It is also true that the finest tenite foliae, especially tho seforming combs in the plessite, are wholly 

 or at least in part dissolved, and therefore the tenite content is higher than is given in the above composition; hence, 

 the tenite undoubtedly plays a smaller part in the composition as expressed above than would be indicated by a 

 study of polished and etched surfaces. Moreover, the tenite is especially prominent in the latter case because of its 

 lighter color and lively luster. The chemical composition of the tenite found by analysis was as follows (substance 

 taken, 0.5303 gram): 



Fe Ni Co Cu P Fe, Ni P 



63. 04 33. 17 0. 38 0. 14 0. 11 3. 28 =100. 12 



Since the content of copper appeared uncommonly high, it was, after weighing as copper oxide, again dissolved 

 and precipitated electrolytically. The second determination was only slightly lower than the first. 



The undissolved residue consisted of grains, crystal fragments, and flakes of schreibersite, and of very delicately 

 formed long needles of rhabdite. 



Iron-nickel pltosphide. — This occurs in two forms, as schreibersite and rhabdite. The first occurs in part as large 

 prismatic or thick tabular crystals 5 mm in length of pure tin-white color, but changing to light-golden yellow. The 

 opaque wavy surface hindered recognition of definite crystallographic habit. All single crystal faces appeared in 

 the form of little facets. Many crystals are strongly hollow on the end, a feature so often seen in pyTomorphite. One 

 auch was hollow in the interior and inclosed tsenite. The schreibersite thus inclines to porous growth. The cleavage 

 is very complete, even to a high degree of brittleness. If the crystals fall on paper they often break into little cube- 

 like pieces. The cleavage perpendicular to the length seems somewhat more complete than in the two other direc- 

 tions — a behavior which indicates the orthorhombic system ; that is, the crystals appear to be a combination of the 



