The study indicates that the chemical cemposition types of various typomorphic minerals are as follows: picotite CrOa-a(c)3aa>53%, Ala-a(c)2aaOa-a(c)3aa￡1/411%,MgO￡1/412%, the value of Craa(c)#aa is above 0a±7, pyrope Cra-a(c)2aaOa-a(c)3>5%, Al_a(c)2aaOa-a(c)3aa<19%, t.

The lacunary picotite was found in the 1950′s and over a long period of time it had been mistaken for the magnetite because of its high reflectivity and magnetism.

Morphological characteristics of chrome spinel which is related to diamond primary deposits;

As a kind of accessory mineral,chrome spinel contained in ultrabasic rocksis complicated in chemical composition,stable in physical property,and strong in antial-teration ability.

The main minerals in the rocks are olivine, chromium spinel, diopside, endiopside, and/or garnet, orthopyroxene, amphibole and phlogopite.

Petrology of ultramafic rock in Darbut ophiolite (Xinjiang),evidence from Cr-spinel.;

Alteration Characteristics of Ore-forming Cr-spinel in the Sartokay Chromite Ore District, Xinjiang

Results from ICP-MS and EPMA analysis show that serpentinite is dominated by Cr-spinel group minerals with an abundance of Cr up to 6187×10-6 and Cr#(=100Cr/(Cr+Al))ranging between 60 and 69,indicating that the formation environment may have relations with supra-subduction zone ophiolite.