1889.] NATURAL SCIENCES OF PHILADELPHIA. 187 



Experimenting with some Garnierite from Africa, the speaker ob- 

 served that the mineral behaves like the present one. It turns 

 brown and in a strong heat again green, not black as Damour states : 

 (Zeitschr. f. Crystallogr. Mineralogie, vol. iii, p. 636.) The speaker 

 thinks it proper to distinguish this zinciferous Garnierite by a new 

 name and proposes De Saulesite in honor of Major A. B. de Sanies, 

 E. M., the present manager of the Trotter mine, to whose kindness 

 in tarnishing the material, the author is much indebted and here- 

 with expresses his thanks. 



4. Tephrowillemite, an intermediate species. The speaker re- 

 ceived from Master Percy de Saules a broken crystal, found at the 

 same depth as the preceding minerals in the Trotter mine. The 

 crystal fragment shows two faces which intersect in an edge 1,5 

 inch long, conforming to 120° measured with a hand goniometer. 

 The crystal is imbedded in well cleaving gray calcite. Its sub- 

 stance is very homogeneous, showing under the microscope but a few 

 very small black grains, most probably Franklinite. 



The color is brownish-gray. Lustre resinous, unctuous. B. B. 

 Is infusible ; yields no water ; furnishes on charcoal a zinc incrusta- 

 tion and with the fluxes a strong manganese reaction. It gelat- 

 inizes completely with cold, concentrated hydrochloric acid. 

 The mean of two analvses gives: — 



SiO 2 =27-75' 0-4925 



Zn O = 60-61 0-7:502 



Mn O = 10-04 0-1360 



Fe 2 O 3 = 2-00 : = 1-80 Fe O 0-0250 ) .8912 



Ca O = trace 



1 



100-40 

 Under the supposition that the iron is all ferrous, the ratio 

 obtains: — 



Si O 2 : (Tn, Mn, Fe) = 

 0-4925 : 0-8912 



1 : 1-85 =1 : 2 



The formula is, therefore : — 



(Zn, Mn, Fe) 2 [Si O 4 ] 



5. Fluorite. — Whilst the species had been found in the mass 

 of the white marble in the quarries south-west of the furnace, it had 

 not previously been noticed within the ore body. The speaker ob- 

 served it in very light pink octohedrons, and in deeply purplish 

 masses, compact, small granular and large granular cleavage pieces. 

 It is chiefly notable as the supporting substance of the De Saulesite. 

 It is largely associated with the beautiful yellow sphalerite. 



6. Apatite. — The speaker noticed this species on a small specimen 

 showing an intimate mixture of the purple fluorite with yellow gar- 

 net. The apatite occurs in small prismatic crystals of bluish-green 

 color. The combination is P oc. P. 2 P 2. 



