THE KORALEIGH STONY METEORITE 159 
crystals, are regarded as chromite. Small opaque inclusions in 
certain of the olivine crystals are probably metallic iron and 
sulphides. Occasional rounded grains of a diopsidie mineral are 
also associated with the more abundant crystals of the silicate 
minerals. 
Two varieties of pyroxene are present. One is the orthopyroxene, 
bronzite; the other shows oblique extinction, up to 36°, so that it 
is a clinopyroxene, probably augite. The orthorhombic variety is 
the more common of the two. Some of the pyroxene crystals exhibit 
wavy extinction, indicative of strain; rare examples of the clino- 
pyroxene display lamellar twinning. 
Opaque Minerals 
The opaque minerals in the meteorite are pyrrhotite, «iron 
(kamacite), limonite and (?) chromite. Pyrrhotite, the most 
abundant of the opaque minerals, forms areas which may be as 
large as 0°12 mm. x 0°25 mm. across, but are more commonly 0°10 
mm. x 0:10 mm. in size. In reflected light, the pyrrhotite appears 
pinkish-brown. It is pleochroic and anisotropic. It can be distin- 
guished from troilite by its etching properties. The pyrrhotite is 
relatively inert to 1 : 1 HNO: and 1 : 1 HCl, whereas troilite effer- 
vesces vigorously with these reagents. It was found by Stillwell 
(1941) that the sulphide mineral in the Caroline stony meteorite 
was also pyrrhotite. 
The iron occurs as corroded remnants of grains which were 
originally equidimensional with the pyrrhotite, but are now partly 
altered to limonite. The iron is readily etched with HNOs, FeCls 
and HgCl:, which indicates that it is iron (kamacite). No y-iron 
(taenite) was detected. Small amounts, presumably of this 
mineral, were thought by Stillwell (1941) to oceur in the Caroline 
aerolite. The iron is occasionally intergrown with pyrrhotite, but 
it is more usual for the two to occur as isolated grains. 
The limonite commonly forms rims enclosing residual areas of 
iron. These rims are much more pronounced about the iron grains 
than around the pyrrhotite. They are connected with small veinlets 
of limonite which traverse the meteorite, and with a fine meshwork 
of limonite threads or films from 0:001 mm. to 0:002 mm. wide, 
which fill almost every grain boundary between the transparent 
minerals. The limonite occasionally forms parallel, needle-like 
inclusions and veinlets through the pyrrhotite. 
Trevorite, which was recorded among the oxidation products 
of the metallic iron of the Caroline aerolite (Stillwell, 1941), was 
not located in the Koraleigh specimen. 
The mineral which is thought to be chromite occurs as small, 
