1899] THE SOUTH AFRICAN DIAMOND 179 
ease it is generally associated with a little calcite, and in one place 
with a radiating acicular mineral, probably a zeolite; in another the 
calcite is mixed with a serpentinous mineral. Larger grains of iron 
oxide appear to be wanting, and I have not observed zircon or spinel, 
or even rutile or pseudobrookite. Some of them might turn up, as a 
diamond might do, if more slices were cut,’ but obviously they are not 
at all common. ‘The second boulder corresponds so closely in mineral 
composition with that just described that a separate description is 
needless. I have also examined a fragment from a third rounded 
boulder, which when perfect must have been about a foot in diameter. 
The rock is practically identical with that of the other two boulders, 
but no diamonds are visible. 
Three boulders, apparently without diamonds, represent another 
variety or species of eclogite. One is a fragment measuring about 
min. < 43 in. X 34 in.; another an unbroken boulder, the girth of which, 
measured in three directions at right angles, is approximately 204 in. 
x 194 in.x 17} in.; and the third is a fragment about 3 in. x 24 in. 
x2 in. In all these the outer surface is rather more decomposed 
than in the three described above, and the same appears true of the 
rock throughout. It obviously consists of three principal constituents, 
with a few scattered flakes of a brownish mica. Two of them, the 
pyrope and the diopside, do not differ from those described above, 
except that the former is slightly pinker in colour; the third con- 
stituent is an altered enstatite. The mica is only moderately 
pleochroic, resembling phlogopite ; a small grain or two of serpentinised 
olivine (as before) may be present. Apparently the minerals have 
formed in the following order: (a) pyrope, () diopside, (c) mica, (d@) 
enstatite. I had slices cut only from the first specimen, as I preferred 
to leave the second intact, and the third was more decomposed than 
the others. This rock obviously is closely related to the normal 
eclogites and to the eulysites—differing from the one in the conspicuous 
presence of a rhombic pyroxene; from the other in containing that 
mineral instead of olivine. If a special name be required I should 
propose Newlandite, but personally should be satisfied with enstatite- 
eclogite, for I prefer to call attention to relationships rather than to 
distinctions. 
In connection with this rock an interesting specimen may be 
noticed, which was obtained from the blue ground. It is an 
irregular fragment between three or four inches long, consisting of 
erystals of a greyish-green rhombic pyroxene, in which one cleavage 
is strongly developed, but with a barely metalloidal lustre. They are 
approximately an inch in diameter, and between them small pyropes 
are rather irregularly interspersed. As I was reluctant to injure the 
specimen by cutting off a slice, I removed a few small flakes, which on 
examination with convergent light proved the mineral to belong to 
1 Five were made from the first boulder, three from the second, two from the third. 
