a 
ON THE OCCURRENCE OF CALCIUM SULPHIDE (OLD- 
HAMITE) IN THE ALLEGAN METEORITE. 
By Wirt Tassry, 
Assistant Curator, Division of Mineralogy, U. S. National Museum. 
The occurrence of calcium sulphide in meteorites was first noted in 
18627 by N. Story-Maskelyne, in the Bustee stone and by him called 
“ Oldhamite.” In 1870”, the same author fully described this mineral 
as occurring in small, isotropic, chestnut brown nodules having a 
cubic cleavage; a hardness of 3.5 to 4; a specific gravity of 2.58; and 
of the following composition: 
CaS. Mes. 
A. 89.569 3.246 
B. 90.244 3.264 
The magnesium sulphide present being regarded by the author 
either as a constituent of the mineral or as a mechanically mixed in- 
eredient. 
Maskelyne, in the same paper, states that Oldhamite is apparently 
present in the Bishopville aerolite, and that it occurs in small, nearly 
round, spherules embedded in enstatite or augite, or in a mixture of 
both. | 
Flight,’ in some further work on the mineral separated from the 
Bustee stone, noticed that when slightly warmed and illuminated by 
burning magnesium wire, Oldhamite emitted an orange-colored phos- 
phorescence.- Later Friedheim “ found in the meteorite from Nagaya, 
a very small amount of calcium sulphide. In the Aubres stone, 
Brezina ° calls attention to the occurrence of minute, yellowish to 
reddish-brown spherules which resemble the Oldhamite as described 
by Maskelyne. Merrill,’ in his paper on the Hamblen meteorite, 
4 Brit. Assoc. Rept., 1862, App. 11, p. 190. 
6 Phil. Trans. London, 1870, CLX, p. 195. 
© Chapter in the History of Meteorites, London, 1887, p. 119. 
d Sitzber., Berlin Akad., 1888, I, p. 366. 
€ Meteoritensamm. k. k. nat-hist. Hofmus., May 1895, X, p. 289. 
iAm. JOUrD. Sci. 1896), Li) pps 152-1153: 
PROCEEDINGS U.S. NATIONAL MUSEUM, VOL. XXXIV—No. 1622. 168 
