THE CAROLINE STONY METEORITE 
47 
(4) and shown to be a common product of oxidation of 
meteoric irons by Shannon (5), Its reflective power is higher 
than that of linionite or chromite, and on the polished section 
its colour is greyish- white with a pinkish tint. It is isotropic, 
slightly harder than linionite, and does not have internal 
reflections. It resembles magnetite except perhaps for its 
pinkish tinge and for its obviously secondary character. It is 
negative to nitric acid and other standard etching agents, but 
is slowly attacked by concentrated hydrochloric acid. Par- 
ticles are magnetic and when dissolved in hot hydrochloric 
acid give reactions for nickel with dimethylgly oxime. 
Occasionally the colloform banding including trevorite 
is cut transversely by newer narrow limonite veins (Fig. 3). 
In some instances margins of areas of massive trevorite are 
corroded by limonite, and in places the edges of trevorite 
bands are separated from limonite by extremely narrow 
whitish zones which may possibly be hematite. These 
phenomena suggest that the formation of trevorite is a phase 
in the oxidation of nickel-iron which will ultimately be con- 
verted into limonite with complete removal of nickel. The 
ratio of trevorite to limonite is small, just as is the ratio of 
nickel-iron to silicates. 
References. 
1. E. V. Shannon and E, S. Larsen. Merrillite and Chlorapatite from 
Stony Meteorites. Amer. Journ. Sci., 5th ser., vol. IX, 1935, pp. 250-260. 
2. M. N. Short. Microscopical Determination of the Opaque Minerals. 
U.S.A. Geol. Surv., Bull. 825, p. 74, 1931. 
3. E. T. Allen, J. L. Crenshaw, J. Johnston, and E. S. Larsen. Mineral 
Sulphides of Iron. Amer. Journ. Sci., 33, 1912, pp. 212-213. 
4. T. L. Walker. Trevorite, a Distinct Mineral Species. Contrib. to Can, 
Min., Univ. Toronto, Ceol. Ser., No. 16, pp. 53-54, 1923. 
5. E. V. Shannon. The Oxidation of Meteoritic Irons. Proc USA. 
Nat. Mus. 72, art. 21, 1927. 
