62 The American Naturalist. [January, 
corresponding to Pb, Sb, Sn, S, The mineral is easily decomposed 
by hot hydrochloric and nitric acid, but is scarcely affected by cold 4 
hpdrochloric acid. Like franckeite and plumbostannite, it is a South — 
American mineral, occurring, as it does, at the Mina Santa Cruz, 
Poopó, Bolivia. : 4 
Hantefeuillite accompanies crystals of apatite, pyrite, iron and mon- | 
azite at the apatite mine at Odegiirden, Bamle, Norway. It is found 
in the greenish nodules composed of wagnerite and apatite, that are 
scattered through the apatite veins cutting gabbro. Michel" describes 
it as forming transparent, colorless monoclinic crystals radically 
grouped. Its hardness is 2.5 nnd density 2.435. The crystals are all 7 
tabular in habit, being elongated parallel to e, and flattened to œP %. 
Their optical axes lie in the latter plane, and their optical angle has a 
value—2Vna = 54° 23’, An analysis gave P,O, = 34.52; MgO= 
26.12; Cao = 5.71 ; H,O =34.27, corresponding to (Mg Ca), (PO,)s 
+8H,O, which is the guano mineral bobierrite in which Mg has been 2 
in part, replaced by Ca. : 
Chondrostibian, as its name indicates, is an antimony mineral occur- 
ring in grains. It is reported by Igelström” from the famous manga- 
nese mine Sjogrufran, Grythyttan, Sweden. Itis found disseminated as 
grains through barite, which, with calcite and tephroite, forms a cryp- 
tio-crystalline mass. These grains constitute nearly 50% of some of 
the barite plates to which they impart a brownish tinge. The mineral 
itself is yellowish-red in color, though in large pieces it appears dark 
brownish red. It is weakly magnetic, and yields, upon analysis, figures 
` indicating the following composition : | 
WO, AsO, Mn,0, FeO, HO Total : 
30.66 2.10 33.13 15.10 19.01 = 100.00 
corresponding to 3R,0, Sb,0, + 10 H,O. 
1” Bull. d. 1. Soc. Franç d. Min., xvi, p. 38. 
18 Zeits. f. Kryst., xxii, p. 43. : 
