Garnet In Thin Section

Refractive index varies depending on type of garnet.

Garnet in thin section. Color in thin section is a pale version of the hand sample color and is often more lightly colored than spinel. This is a microscopic view of a garnet grain that has grown in schist. The large black grain is the garnet the red elongate grains are mica flakes.

Garnets commonly occur as euhedral to subhedral dodecahedral 110 or trapezohedral 112 crystalss which in thin section yield six or eight sided cross sections. Ultramafic igneous rocks almandine. Alex strekeisen i vetrini della mia fantasia.

Garnets x 3 y 2 sio 4 3 named from granatum a pomegranate for its resemblance to seeds of this fruit garnets are nesosilicates having the general formula x 3 y 2 sio 4 3 the x site is usually occupied by divalent cations ca 2 mg 2 fe 2 and the y site by trivalent cations al 3 fe 3 cr 3 in an octahedral tetrahedral framework. If you re looking for the characteristics of specific garnets please refer to their individual pages. The garnet has grown by replacing displacing and including the.

Garnet mica schist in thin section. Nearly colorless to a pale brown pink green. Typical garnet in mica schist and gneiss spessartine.

High relief in thin section. The black gray and white grains are mostly silt or smaller size grains of quartz and feldspar. Nearly colorless pink light reddish brown.

Garnet in ppl and xpl in thin section from the bryn mawr college thin section collection.