It occurs in association with : zincite, willemite, franklinite, rhodonite, jacobsite, diopside, gageite, bustamite, manganocalcite, glaucochroite, calcite, banalsite and alleghanyite.
32.
Jadeite forms solid solutions with other pyroxene endmembers such as augite and diopside ( CaMg-rich endmembers ), aegirine ( NaFe endmember ), and kosmochlor ( NaCr endmember ).
33.
At amphibolite facies, the diopside-in isograd is reached ( dependent on carbon dioxide partial pressure ) and metamorphic assemblages trend toward talc-pyroxene and eventually toward metamorphic olivine.
34.
For example, many metamorphic limestones, marbles, and calc-schists, with crystalline dolomites, contain silicate minerals such as mica, tremolite, diopside, scapolite, quartz and feldspar.
35.
The matrix consists of an extremely fine-grained groundmass with fine-to coarse-grained megacrysts of biotite, diopside, aegerine-augite, orthoclase, magnetite, apatite, and nepheline.
36.
Minerals associated with brownmillerite in the Mayen locality include calcite, ettringite, wollastonite, larnite, mayenite, gehlenite, diopside, pyrrhotite, grossular, spinel, afwillite, jennite, portlandite and jasmundite.
37.
Group I kimberlites exhibit a distinctive inequigranular texture caused by macrocrystic ( ) to megacrystic ( ) phenocrysts of olivine, pyrope, chromian diopside, magnesian ilmenite and phlogopite, in a fine to medium grained groundmass.
38.
A piece of the mantle is shown at right ( orthopyroxene is black, diopside ( containing chromium ) is bright green, and olivine is yellow-green ) and is dominated by olivine, typical for common peridotite.
39.
It occurs with calcite, ettringite, wollastonite, larnite, brownmillerite, gehlenite, diopside, pyrrhotite, grossular, spinel, afwillite, jennite, portlandite, jasmundite, melilite, kalsilite and corundum in the limestone xenoliths.
40.
The lake Ellen Kimberlite is popular with rock hounds as the classic indicator minerals ( pyrope, magnesian ilmenite and chrome diopside ) for kimberlite are easily found in the material, though few are of gem quality and size.
