After reanalysis, these two minerals plus the garnets and
omphacite were routinely used as standards in subsequent studies (2).
E[acute accent]Processing of till samples yielded numerous high interest kimberlite indicator minerals (KIM) including high-chromium & low-calcium G10 pyropes garnets within the diamond window field, G9 pyropes, diamond-inclusion and harzburgitic chromites, picro-ilmenites,
omphacites (indicative of eclogitic rock material within kimberlite), chromium-diopsides, and magnesium-olivines.
Then, in the table of his FIGURE 7, he qualifies this Na-amphibole as
omphacite, and the amphibolitic blocks bearing it as eclogites.
Associated minerals in blue jade are: jadeite, titanian
omphacite, sodic amphibole, titanite, rutile, anatase, strontium-apatite and tausonite.
The technique was useful for differentiating areas of jadeite and
omphacite within compositionally and texturally zoned samples.
The main structural characteristics of
omphacite jade and its influence on transparence.
Dominic Mok covered jadeite testing, using a variety of samples including types A, B, C and B+C jadeite; chrome-green cat's-eye nephrite; General Electric synthetic jadeite; and various qualities of jadeite from vivid green to light green ('pea'/'bean' green); lavender, 'icy' and 'glassy' varieties; and
omphacite fei cui that appeared deep green in transmitted light and black in reflected light.
