Plagioclase commonly shows this type of twinning, called the Albite Twin Law, with {010} as the twin plane. Such twinning is one of the most diagnostic features of plagioclase. If the …

In thin section, plagioclase commonly shows the characteristic albite polysynthetic twinning. This twinning is the most characteristic identifying feature of plagioclase, and makes its …

Albite twins are most common in the plagioclase feldspars, but they can also be found in other minerals, such as microcline feldspar and orthoclase feldspar. Spinel cyclic twin from Pyin-Oo …

In thin section or grain mount, the general lack of pleochroism and the twinning are good indicators. The presense of parallel striae on cleavage surfaces distinguishes plagioclase from …

2022年12月16日 · For example, the plagioclase twinning in Figure 4.44 is albite twinning, and the K-feldspar twinning in figure 4.41 is Carlsbad twinning. The domains in albite twinning are …

In both igneous and metamorphic plagioclase, glide twinning on the albite law is exceedingly common and is usually associated with somewhat less abundant glide twinning on the …

Primary twinning on the albite and pericline laws is quite common in igneous plagioclase, but is uncommon in metamorphic plagioclase. Glide lamellae in plagioclase are typically of uniform …

combinations of albite, carlsbad and pericline twinning in albite of sodic granites is probably a relict feature inherited from originally more calcic igneous plagioclase now replaced by albite.

The occurrence of twinning in plagioclase must be considered in terms of both the external conditions obtaining during and after crystallization and the internal factors which have been …

Polysynthetic twinning in plagioclase forms during the transition from high-temperature to low-temperature structures and may be absent at all in plagioclase (i.e. nearly pure albite) that …