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Sodalite and spinel are unlikely to occur in the same rock anyway.
Spinel in thin section. Accessory minerals include plagioclase spinel garnet ilmenite chromite and. Subequant anhedral grains also are common. Crystals rounded or equant if well formed may have 6 or 8 sides in thin section.
Anomalous pleochroism is sometimes observed. High 17 40 ve extreme pinky buff colours occasional. Titanite im colourless or pale brown.
Cr mg al rich chromites are realtively transparent and can be dark brown at full thin section thickness. Spinel is isotropic but its green color distinguishes it from colorless to pink garnet and colorless fluorite and its high relief and color from sodalite. A lherzolite is an ultrabasic igneous rock dominated by essential olivine and clinopyroxene and orthopyroxene in equal proportions.
It has very high relief. There are few common isotropic minerals. The most likely ones to see in thin section are garnetand spinel.
Spinel in thin section fkm 162 ppl polarizer rotation. Chromite is a spinel type mineral like magnetite and has an extensive solid solution in the magnetite composition direction. Spinel lherzolite the name is derived from the lherz massif an alpine peridotite complex also known as orogenic lherzolite complex.
There you ll find additional information on this and many. Chromite is dark brown to opaque at full thin section thickness. May have zones or trails rich in inlcusions of quartz biotite etc which may show s or z shapes.
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