Cleavage In Thin Section

Vitreous pearly on cleavage surfaces cleavage has perfect cleavage on 001 and good cleavage on 010.

Cleavage in thin section. Chromite is dark brown to opaque at full thin section thickness. Actinolite in actinolite schist plane polars actinolite in actinolite schist crossed polars. Although commonly light yellow green in thin section it may be colorless.

Actinolite ppl actinolite plane polars. In hand sample calcite can be distinguished by its rhombohedral cleavage and if the sample is translucent enough its double refraction. But are difficult to see in thin section due to very low relief.

Cleavages intersect at 90. 110 cleavage is poor. Glaucophane has length slow riebeckite length fast.

60 120 cleavage actually 56 and 124 xpl. It can be difficult to see cleavage in thin section due to orthoclase s low relief. It has parallel extinction relative to its usual long crystal dimension the b direction but inclined excinction looking down b relative to its 001 cleavage.

Actinolite plane polarized light. Actinolite in thin section thin section gigapans. Identification tables for common minerals in thin section these tables provide a concise summary of the properties of a range of common minerals.

Biotite for example often shows a single cleavage set of parallel cracks but biotite s cleavage will not be visible if a grain is viewed in a specific orientation see section on biotite below. In thin section calcite can be distinguished by its parallel extinction. Sometimes after 1 or 2 directions.