Mixed
with the diamonds in the concentrates are a number of other minerals of
high specific gravity, and some of notable beauty though they have no
marketable value. Among these are the rich red pyrope, the
flesh-colored zircon, the blue disthene, bright green chrome diopside,
pale green rhombic pyroxene, and olivine occasionally in large,
polished pebbles. Some of the garnets are of fine quality, and one was
recently cut which resembled a pigeon-blood ruby, and attracted an
offer of £25. The complete list of minerals found on the sorting tables includes: (1) pyrope, having a specific gravity
