What is Turquoise ?
Turquoise is a collection of phosphate minerals of copper and aluminum, most characterized by opaque blue. There are also light blue, blue-green, green, light green, yellow-green, gray-green, pale white and so on.
The general hardness is 5 to 6, the density is 2.6 to 2.9, and the refractive index is about 1.62. Under long-wave ultraviolet light, it can emit light green to blue fluorescence.
Turquoise is a kind of copper-aluminum phosphate with water after modern mineralogical study, which is classified as phosphate mineral. This is a mineral formed by water precipitation. In the process of liquid immersion precipitation, the color of turquoise changes from blue and green to light green and light yellow. The hardness varies greatly due to the crystallization pressure and later pressure and weathering conditions in the ore-forming process. Turquoise is classified as a semi-precious stone in the identification and classification of modern gems, in which blue is a precious jewellery variety, blue and turquoise are pure colors, and those with dense structure can be the first choice for high-end art carvings. turquoise is a kind of precious jade appreciated by both the East and the West because of its beautiful color.
Gem turquoise is formed in the geological process, reaching the jade grade, which is mainly composed of turquoise minerals. This definition emphasizes that it is formed in the process of geological process, which is different from synthetic turquoise and other jade.
Turquoise is usually classified according to origin, color, luster, texture, structure and structure, and many classifications are more or less extended to the quality grade of turquoise, so it has hierarchical significance.
By color.
A, blue turquoise (Blue turquoise): blue, opaque blocks, sometimes dark turquoise.
B, light blue turquoise (Pala blue turquoise):, light blue, opaque block;
C, turquoise (Blue-green turquoise): turquoise, opaque block;
D, green turquoise (Green turquoise): green, opaque block;
E, yellowish green turquoise (Yellow-green turquoise): yellowish green, opaque block;
F, emerald turquoise (Emerald greenturquoise): emerald green, Yuhua part of the lamp is transparent;
G, light green turquoise (Greenish turquoise): light green, opaque block.
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