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Inner Mongolia's red, sapphire


Because, as early as l3 years ago, I engaged in gem resources in the region when the field investigation, went to the site were investigated and the results incorporated into the geological research study report. Last summer, a miners Alashan fork to find me, he brought two bags of specimens of corundum crystals, and individual are great, while the small diameter of 0.5 cm, and the larger l0 cm (weight 62 grams), ~ as more in the 1-3 cm, was really made me happy for a while. However, after a study identified and the process tests, my heart would cool down. Expectations may be too large, too rebellious generated, link writing an article of interest are gone. May also be known as the \Corundum deposits occur in Archean Alxa group gneiss and granulite rock, mixed rock containing ore goes directly to rock for two plagioclase granulite and mica K-feldspar rock, showing lens-shaped,[link widoczny dla zalogowanych], usually long 5-l (】 meters wide and 1.5 m l a maximum width of 2.5 meters. unconformity and rock was like, it is possible for the Pacific jade Mohs hardness of H = 9, but here the hardness of jade cut production large range, H = 6 - 7. cut jade density is generally 3.95-4.40 g / cm, but here is the low-density corundum produced only 3.8-4.2. The microscope observed (under the magnifying glass to see), rich in mica inclusions up to levels of 1-1O%, which is caused by low hardness and density of the corundum internal reasons. In addition, see a small amount of rutile, titanium iron ore and garnet inclusions. The technology test, a 10 × 14X20ram specimens, only the ring surface grinding out a 5X7mm, with the rest because the mica pack of Proterozoic intrusive or a small rock, the highly degenerate Roles and rock blend together. orebody corundum content of about 0.5-5%, and containing a small amount of spinel, rutile crystals. Taiwan host rock was dark green,[link widoczny dla zalogowanych], black jacket, blue gray, granite crystalloblastic structure, spots on the structure, massive structure. corundum red feldspar crystals surrounded around the meat or chlorite, pyrophyllite, kaolinite thin green \, drum-shaped crystal size (diameter) from 0.3 to 10 cm range, individuals are generally larger. color blue, gray blue, orange and blue. dark blue, pink, purple, gray and purple , black and purple, rarely red. rigid body can not use too much. availability of less than 10%. From the point of evaluation process, it is nowhere near the utilization of Changle, Shandong sapphire, but the color than the Changle sapphire to light, transparency higher. from the specimen collection or viewing angle, while a higher value. based on the views of Zhonghua Bang could be called \). The deposit is mainly produced by Sapphire (including various shades of blue and purple), a rare ruby. because of its rock in the plagioclase, potassium feldspar and other minerals of mica, kaolinite petrochemical stronger, more loose ,[link widoczny dla zalogowanych], and corundum peeling,[link widoczny dla zalogowanych], miners used to cut jade are all individuals, I told him after the Yu-cut mining to make a long time on the rocks (see photo), the collection of higher value. In addition to original deposit, but also saw a sand Mine, pastoralists often picked up in the desert or Gobi. After the natural ground corundum sand specimen is more beautiful, crystal cute. I think that the formation of the deposit, mainly referring to the formation of corundum, and metamorphic ashamed to use relevant, growth pattern, growth lines very obvious, with many inclusions of mica, arts and crafts from a very low success rate,[link widoczny dla zalogowanych], very few can reach gem. but the larger individuals, full of ornamental, ornamental stones as specimens or collections, you have higher value. 5l
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