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Jadeite Jade's Color Shape And The Process Of Post-stack Formation Change

Posted on:2009-03-31Degree:MasterType:Thesis
Country:ChinaCandidate:Y T ChuFull Text:PDF
GTID:2120360242492927Subject:Mineralogy, petrology, ore deposits
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Jadeite Jade, as a kind of Jade with high quality, which formed by Pyroxene as the main mineral aggregate, pertain to petrology category. Jadeite Jade is the general designation of Jadeitite and Omphacites which obtain precious Jade level, and it has technic value and commercial value in commerce. Also, it has many excellent gemological characteristic, such as gorgeous and changefully color, the tightness and the hardness of its texture, beautiful luster and good toughness. Those characteristics attribute to its mineralogical and petrological characteristics. Jadeite Jade famed as "the king of jade" is popular with people causes it's excellent gemological characteristic.Jadeite Jade is a special kind of metamorphic rock with variable texture type. The paper study the texture of Jade from the Generation of Jade's texture, grain size, crystal morphology, inter-contract relationship group of minerals and genetic analysis. The general structural characteristic of Jade express it's formation undergo multistage metamorphism, such as metamorphic recrystallization, metasomatic metamorphism, dynamic metamorphism, and formed complex mineral composition and texture. Dynamic metamorphism is the direct cause made quality of Jade varied. Deformation structure with fine grain-filiform crystalloblastic texture as the main structure, which undergone dynamic metamorphism, is special in all types of Jadeite. The main textures of high quality Jadeite contain the following texture types: First, mylonitic texture which undergo intense shearing stress and ductile deformation. Secondly, crystalloblastic texture (formed in regional metamorphism) and metasomatic crystalloblastic texture (formed in hydrothermal alternation).The color-causing of Jadeite Jade is complex and of varieties. Jade's color obtain white, colorless, green, red, yellow, purple, black and grey, etc. The modal Jadeite has green color and various varieties, it's also the most costly Jadeite. In all the elements which influence the value of Jade, color is the first element; while texture is the critical factor influencing the quality of Jadeite Jade, which decide the beautiful and transparency Jade directly, and color depend on transparency. So, the distribution of color, morphology, color's dark and light of Jadeite Jade has necessary relationship with it's texture. In abundant predecessor's document, there are seldom record combined color and texture and discussion. The different formation effect of Jade could make the variety of Jade's color. And the man-made would change the Jade's color, too. Therefore, based on predecessor's study to make genetic classification of Jadeite's color, and put forward a theory that the Jade's color can be divided into original color and superposition-color. The original coloration is due to the formation of Jade's color to the color hydronium. The color formed after the original colors are collectively referred to superposition-color. It includes natural superposition-color and man-made color. Natural superposition-color means secondary origin color, formed in hypergene geologic process, in which secondary minerals fill intergranular of minerals or crack, thereby Jadeite Jade present restrictive color. Man-made color methods depend on changing or adding the color of Jadeite which contain more impurity or inferior. This paper used electron probe analyses chemical components. And combine to the ultraviolet-visible-near infrared absorption spectrum and analyse the color-causing mechanism of multicolor. Minerals which present color has various kinds (including Omphacite, Kosmochlor, Glaucophane, etc), Jadeitite present green color for it contain appropriate amount of Cr3+, also the main reason forming high quality green Jadeite. Fe,Mg in crystal lattice of Jadeitite did not have much contribution to Jadeite's color, they can not make Jadeite present color individual, only influence the green color in jadeite appear blue or grey partially. The purple color of Jadeite Jade is the reason that Jadeite contain ion which make it present color. Based on analyses and study, it conclude that Jadeite present purple for the Mn3+. And purple color should be formed earlier than green color or formed simultaneous. White, colorless, green (except grey green) and purple are the original color of Jadeite, while yellow, drab, red, redish brown are called "jade's red color", means secondary origin color. Man-made color usually add red, green and purple on Jadeite, especially the green colored jadeite is the most difficult to recognize.This article from the Jade's structure and color mechanism for the formation of the transition to color the original color and superposition-color's state. And make my opinion about the cause of the color. Then discuss the superposition process of the multistage of Jade's color, summarize the regular of superposition-color of Jadeite, and discuss the geologic function in which it's formation.
Keywords/Search Tags:Jadeite Jade texture, original color, superposition-color
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