In Figure 5, there are particles with crystalline habit of the subhedral
to euhedral type with well-defined plans; these could correspond to kaolinite (Figure 5(a)), dickite (Figure 5(b)), and illite (Figure 5(c)) in aggregate form.
The zircon crystals occur as subhedral
to euhedral grains up to 100 [micro]m in diameter that mostly are in contact with other accessory minerals, such as Fe-Ti oxides, apatite, and xenotime, and exhibit oscillatory zoning (Fig.
Hence, this subhedral
zircon is more complicated to interpret (see below).
The coarse fraction of the samples was composed of euhedral and subhedral
angular grains, mainly quartz, feldspars and plagioclases, with a small proportion of shards of acid volcanic glass, phytoliths, and mica and pyroxene grains.
The plagioclases are euhedral to subhedral
that show evidences of fracture and breakage.
The younger Li-mica frequently forms irregular aggregates of subhedral
Pyrolusite minerals develop in small veins and characteristic with anhedral and subhedral
Minor disseminated subhedral
to euhedral magnetites are common in the area, dominantly appears in chlorite-schist (Figure 3(d)).
One is in the form of subhedral
to euhedral crystals and second is in the form of intraclasts of dolomite.