• Colour and Pleochroism: Usually colourless, gray, pale green or pale brown, darker colours associated with Fe-rich varieties titanaugite is more distinctly coloured from brown/pink to violet. • Form: Form stubby prisms elongate along the c-axis, basal sections are 4 or 8 sided and show two cleavages at 90.°.

PPL image, 2x (Field of view = 7mm) Pyroxene in basal section (with colorless apatite inclusions) in a xenolith from Vulsini volcano, Italy. PPL image, 10x (Field of view = 2mm)

Series of photomicrographs showing the weak pleochroism of Clinopyroxene (top two photomicrographs, taken in plane polarized light). The bottom photomicrograph (taken in cross polarized light) demonstrates the higher birefringence of Clinopyroxene compared to Orthopyroxene, as well as the fact that it does not exhibit straight extinction.

Orthopyroxene crystal in a dacite. PPL image , 10x (Field of view = 2mm) Orthopyroxene crystal with clinopyroxene rim in a dacite. XPL image , 10x (Field of view = 2mm) Orthopyroxene crystal with clinopyroxene rim in a dacite. XPL image , 10x (Field of view = 2mm) Orthopyroxene crystal. PPL image , 10x (Field of view = 2mm)

2021年3月9日 · Rare-earth elements (REE) in mantle rocks have been widely used to study partial melting, melt migration and melt–rock interaction processes in the mantle. Most geochemical studies of REE in spinel peridotites focus on clinopyroxene (cpx) which is the major repository of REE in the peridotites.

2019年9月1日 · A high-T plastic deformation is recorded in the bent and kinked Cpx crystals with anhedral grain shapes and abundant exsolution lamellae of Opx. PPL. PPL = plane polarized light. Width of field = 7.5 mm in all microphotographs.

Microscopic views (XPL, crossed polarized light; PPL plane polarized light) of peridotites, pyroxenites and gabbros. (a) Crspinel-bearing wehrlite sample. (b) Interstial olivines in a pyroxenite...

A high-T plastic deformation is recorded in the bent and kinked Cpx crystals with anhedral grain shapes and abundant exsolution lamellae of Opx. PPL. PPL = plane polarized light.

PPL（Pay-per-Lead）：根据每次通过网络广告产生的引导付费的定价模式。 例如，广告客户为访问者点击广告完成了在线表单而向广告服务商付费。 这种模式常用于网络会员制营销模式中为联盟网站制定的佣金模式。

2005年11月12日 · Clinopyroxenes (cpx) in abyssal and ophiolitic peridotites are commonly analyzed for lithophile trace element abundances in order to estimate degrees of melting and porosity conditions during melt extraction, assuming …