The mineralogy of ruby ​​is called corundum, also known as corundum, that is, the original mineral of ruby ​​is gem-quality corundum. The name of ruby ​​is very strict, especially the restrictions on color are very strict. It refers to a gem-quality corundum with a deep purple, slightly purple red, red, and pile red. Usually, a gem-quality corundum that exhibits various shades of red is called ruby. The mountain contains 0.1-3% of three longitudinal chrome, which makes it bright and beautiful.
The ruby ​​chemical composition is aluminum oxide, and contains a small amount of chromium, iron, and chin. It is red to pink due to the trace element chromium. The color distribution is often uneven, with early bands or color blocks. The shape of the body is often in the form of a braid, a short column, a plate, etc.: it has a flat crystal growth pattern. The aggregates are mostly granular or dense blocks. Hardness is 9, second only to diamond; no cleavage, crack development: brittle. Density 3.95-4.10 gram square thick rice, tribute 3.97-4.05. Transparent to translucent: glass luster. The refractive index is 1.76^-1.77, and the birefringence is 0.008-0.010. The dichroism is obvious and is a heterogeneous body. Under long- and short-wave ultraviolet radiation. Red and dark red fluorescence: The highest chromium content, its fluorescence is strong. The visible light absorption spectrum has obvious absorption lines at 694.2 nm and 682.8 rim in the red region: from 620-540 nm, there is a broad absorption band; at 468.5 nm, there is a weak absorption line.
Sometimes, with a special optical effect, a starlight effect, under the illumination of light, will reflect the fascinating six-shot or twelve-shot starlight, commonly known as "six lines." or "twelve lines." Translucent or opaque rubies, mountains 1'-The existence of tubular pores or tiny acicular rutile inclusions produced during the growth of the body, so that after the ruby ​​unicorn is formed into a curved ring face or other accessories on the vertical C axis, the star effect can be produced by the ornament. The six-shot star of the day and even the twelve-shot star ruby.
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