These provide the usual gemmological constants, but also some welcome additions such as a glossary of gemmological terms and special sections on chrome spinel
, feldspar, garnet and ivory.
Also mineralization in rocks consist: Chrome spinel
, Iron--titanium,chalcopyrite, burnit, malachite ,azurite and iron minerals.
Small euhedral to subhedral crystals of chrome spinel
or, locally, magnetite are scattered throughout the groundmass.
Deep drilling will be performed at other magnetic targets, some of which have produced significant indicator minerals, including a pyrope garnet at one locality and chrome spinel
from all the anomalies.
chemistry of other sample material indicates that a further two volcanoclastic/intrusions may also be diamondiferous.
Traces of initial minerals like Olivine, Orthopyroxene, and Chrome Spinel
are observed in the form of isolated islands.
The dominant mineral phases are identified as pyrite, chalcopyrite, galena, pentlandite, cobaltite and chrome spinel
A significant number of the samples have proven visually positive with pyrope garnet, picroilmenite, chrome spinel
and many of the grains show little sign of mechanical erosion.
The ultramafic cumulates in the WO include wherlite (olivine, diopside with enstatite, magnetite and chrome spinel
as accessories), harzburgite (olivine, enstatite, with minor accessroes of diopside and chrome spinel
), and dunite (olivine with minor clinopyroxene); wherlite being the most common and dunite being the least.
chemistry indicates potential for an additional two pipes to be diamondiferous.
Among the seven analyzed kimberlitic chrome spinel
grains, one belongs to the diamond field.
They were treated with heavy liquids, by magnetic and paramagnetic separation, and are being studied for the presence of KIM's: pyrope garnet, picroilmenite, chrome spinel
, chrome-diopside and magnesian olivine.