Thin Section Of Quartz

Cleavage is poor such that grain fracture is irregular.

Thin section of quartz. Calcite is quite soft and undergoes substantial surface deformation during normal thin section grinding. Without the quartz plate the quartz appears as such. The last two characteristics distinguish it from most feldspars.

Titanite im colourless or pale brown. The quartz reacted with the magma to grow a rim of hornblende. Crystals rounded or equant if well formed may have 6 or 8 sides in thin section.

The distorted crystal surface combined with its high birefringence results in incomplete speckled extinction. The volume of quartz grains dissolved at the stylolite is. Add tags comment rate.

In order to find the sign of elongation of quartz we used a thin section and the quartz plate to determine whether quartz is a length slow or fast mineral. Quartz thin section photomicrographs are taken in plane polarized light and cross polarized light and can easily be recognized under the microscope. White grains are quartz and feldspar.

Sometimes it s better to let the quartz be a little thick than to risk grinding too much material off your thin section. Quartz belongs to the hexagonal crystal system. In crossed polarized light the quartz grain can go extinct all at once called monocrystalline quartz or in waves called polycrystalline quartz.

If it s more than 30µ thick quartz will display 1 st order yellows instead of 1 st order grays. High 17 40 ve extreme pinky buff colours occasional. Later the magma became quartz saturated and grew quartz and hornblende as distinct separated crystals.