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| A STUDY ON DIAOYUDAOITE-A NEW MINERAL |
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| Abstract: |
| Diaoyudaoite was discovered in 1982 as a new mineral in surface sediments on the sea floor of southern part of Okinawa Trough northeast of Taiwan province of China about 150 km, near the Diao Yu Dao (Island) (123°22’E, 25°26’N). Diaoyudaoite is named after its occurrence locality. Diaoyudaoite is colorless-light green and usually thin, tabular in shape with a grain size of 0.4×0.2×0.03mm, specific gravity Dobs=3.30, Moh’s hardness = 7.6. The mineral is uniaxial crystal (-) , Nω = 1.6876, Nε = 1.6630. The chemical formula has been calculated on basis of 17 (O) as (Na0.87K0.02Mg0.02Ca0.01)0.92 (Al10.84Cr0.15Si0.02)11.01Ol7. The mineral is of a hexagonal, with a = b = 5.602A, c = 22.626A, α = β=90°°, γ = 20° Z = 2, V = 614.89A3, space group: p63/mmc. The X-ray powder diffraction data are 11.2(10) (002) , 2.68 (7) (017) , 5.65 (6) (004) , 2.505 (5) (114) , 2.246 (3) (116) , 2.028 (4) (026) , 1.413 (4) (0213) 1.400 (6) (220) . |
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