Polarised light micrograph of a thin section of syenite, a coarse-grained igneous rock, containing the mineral augite. Augite occurs as a prismatic crystal which in cross-section appears almost square or octagonal. It is a common component of basic igneous rocks such as gabbro, dolerite and basalt. Magification: x20 at 35mm size. .

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TOP06671125

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達志影像

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