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Lithium Pyroxene: An Overview

Lithium pyroxene is a mineral composed of calcium, magnesium, iron, and lithium. It is found in igneous and metamorphic rocks, as well as in meteorites. It is usually colorless or white, but can also be found in shades of yellow, brown, and pink. Lithium pyroxene has a density of 3.2 – 3.6 g/cm³ and a Mohs hardness of 6 – 7, making it relatively hard. It is also relatively heat-resistant, with a melting point of approximately 1,400 °C.

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    It is mainly colorless, rose-colored, light yellow-green, with a small amount of emerald-green, and the transparency is from opaque to transparent. The opaque ones are mostly pale in color, and the mineral composition is complex. With fibrous structure. Silky luster; jagged fracture; refractive index and specific gravity vary according to the content of alteration minerals. Transparent lithium pyroxene is light blue-green to emerald green, glassy, shell-shaped fracture, refractive index of 1.660 ~ 1.675, specific gravity of 3.168, polychromy is obvious, even the naked eye can be distinguished: rose-like purple, red deep purple and colorless; emerald green can show light yellow-green, green and light blue-green. Two sets of nearly perpendicular {110} solutions developed. Under the Charles filter, the emerald-green lithium pyroxene appears green.
    In long- and short-wave ultraviolet light, different colors of lithium pyroxene show different strong and weak fluorescence, generally purple lithium pyroxene produces orange fluorescence in long- and short-wave ultraviolet light; yellow-green species show weak orange-yellow fluorescence (long-wave) and no or weak fluorescence (short-wave).
    Under the spectroscope, the emerald green lithium pyroxene has a double line in the red region, two weaker lines in the red and orange regions, a wide band centered in the orange region, and general absorption in the violet region; while the pale yellow-green has only two narrow bands in the violet region.

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