354 Sixth Supplement to Dana’s Mineralogy. 
Form monoclinic; _ _ °, O: [=90° 17’, O:ii=—= C= 90° 33’, Opti rs 
$ two axes 
bisectrix positive, pect jnalin ed 74° 27’ towards a norm 
different varieties, violet, brownish-or: posededl ; lustre bright: trahihedbe, “The 
crystals approach i — those of a chromate of lead, although quite different in 
—— O: 3-4 = 122° 63’ 0: 44=174° 2’, O: 14=138° 22’. Various other 
angles are given in thes aia The hea yellow and rose varieties differ in their 
modifications, Composition according to 
Mn ai ue Mixed sand. 
J. Yellow variety, Sonn 41°15 810 12°35. 036= 9991 
42:04 6°75 vibe 050= 99°49 
“% a " 37 83 41°80 8-73 11°60 0°30 = 10026 
whence the oxygen ratio for H, R, B,1:1:2, and the formula (Mn, Fe)? P2 +5H- 
Iatparre.—See Silver-Glance. 
Tron Ores.—The iron ore of the Iron Mountain, Missouri, afforded E. Harrison 
(Proc. Bost. Soc. Nat. ctl Rie a p- 295) Iron 68-95 oxygen 27-00, sand, etc., 3°07, 
manganese trace = 99 Besos, sane of ae ematite, He, An analysis 1s 
dokseeanavite N, Nordenski iold—According to Nordenskiold (Ball Nat. 
Moscow, 1857, p. 223), this mineral occurs in crystalline masses, fer er 
to two directions inclined to one another, 124° pis” colo’ 
to to brown ; high lustre, sie nag adamantine when coistiong: Ne ° ited is is epi’ 
oO ; fuses easily Poe age nt glass ; roa a clear 
pba borax; pra th @ reaction for silica; a color with cobalt-solution. No 
action with acids. [The angle is that of senshi x leenble nde. | 
Layraantre [p. 436 and I, III, IV].—Lanthanite is found, according to W. P- 
Blake, > sol Ss — ) with alta at at the Sanford Iron Ore Bed, Moriah, Essex 
county, tis in delicate es or a thin scaly crust in fissures in he 
ore, ne on seas ie tals. The scales or plates have a cleavage, like mica, and 
some are quite brilliant; lustre pearly; color varying from white to a delicate cate’ pink 
or rose-tint, 
Laris Lazuzt [p. 229]—Lapis Lazuli and its associated minerals at Bucharei, 
bed by N. Nordenskiold. in Bull. Soc, Imp. Nat. Moscow, 1857, 
No. 1, p. 213. It occurs in regular dodecahedrons having also the faces of the pr 
a. Color blue, —— red, and Sipe The specimen analyzed by Var- 
cana, ee, from Bucharei. The crystals occur in limestone with small 
erys' padi glaucolite and kokscharovite. 
Lavmontir fore 307, and IV, V].—According to H. How “By cg Journal, Pe 34) 
laumontite is ab undant at Port George, Nova Scotia; the ve 
inches thick, and a £ Macgpretvilla it te oblated green by compar. 
LECONTITE, W. J. Taylor—The Lecontite of Taylor (Proc. Acad. Nat. Sci. 
Philad., and this vol., p. 278) is a sulphate of ammonia and soda, from a cave (cave * 
| Piedras) frequented by bats in the vicinity of Co agua, Honduras, where 1 
their excrements. Crystallization trimetric; cry: 0 L 
partly narrow leone inch long, and partly very short and broad. Sets 4 
T: F=108° 12/; é-2 :¢-2=115°, 27: 47==127° 30’ to 128°; 128° gives 
for abet — 7’. H=2~—2°5. Clear and colorless when free. from the exterior 
< : noel taste saline and rather bitter; permanent in the air. nm , 
Dae on A Org. & Inorg. residue. 
ge pe 19°45 trace 
atio: acid and water, 8-93; SOM ius oi 3-4; 
Les in which the ammo the other bases 
