64 Mineralogical Notices by Prof. Meneghini. 
oxalate of ammonia and affords but a very small precipitate with 
otash. In aclosed tube yields water. B. B. intumesces muck 
and affords a milk-white enamel. 
Sloanite.—Occurs with the preceeding. 'Trimetric; and in 
radiated masses with very distinct cleavage poate! to all the fa 
ces of a rhombic prism; M:M=75° and 1 H=45, G= 
2-4 White ; opaque ; pearly ; transverse fracture irregular, but 
frequently ina plane at right angles to the radiation of the prisms, 
rons ition :— 
Al Oa Mg Na. K H 
49° bY; 35000 8119 2670 0250 0030 12:500—98-7564 
Formula (Ca, Mg)*Si2-+-6Al Sit-19H=Si 49-47, £1 35-41, Ca 9°69, HL 1241. 
the closed tube viele some water. B. B. fuses without intumes- 
cence to a white enamel. 
Schneiderite—Occurs with the preceding, in the Gabbro ross0, 
along with Humboldtite (?). Mass Senses laminato-radiate ; 
white ; opaque, H=3. Composit on 
Ca Meg K&Na H 
4T-794 19° nee ae BPE 11 ede Ll aS), 3 409=100. 
cptted by oxalate of ammonia. Tn a closed ‘ass se ae 
uses with intumescence to a blue enamel 
S —Dimetric. In acicular. sectansgiar prisms, a centi- 
meter oe very slender, terminating in pyramids or truncated; 
aE aie ; colorless ; transparent. H=32. G=2-450. Co 
sitio * 
= 
3 Al Mg Na K i 
49167 19663 13500 10520 1-230 6°575==100°675. 
Formula, (Mg, Na) Sit+A Si+ett—Si 49-555, 21 19-364, Mg 14564 
Nai1079, H 6438, We might deduce (Me, Na)? Si+31 Seen, and 
there are some analogies for it as well as for the other. ‘The 
oxygen ratio for the protoxyds, peroxyds, silica and water, 1: 1: 
3:4, is new; and [ trust the species may prove to be well- 
Sea ,and aaa to we the name, justly famous, of M. Savi. 
tat the acids; the miniics ea age with potash a floceulent 
when moistened — 
