baddeleyite การใช้

• It has been observed that baddeleyite without twinning is extremely rare.
• Baddeleyite was first found in Sri Lanka in 1892.
• It has been observed in thin section that baddeleyite forms within plagioclase grains.
• Because of this, the coordination of baddeleyite was determined to be sevenfold.
• This explains baddeleyite's tendency to twin along the ( 100 ) planes.
• Its most naturally occurring form, with a monoclinic crystalline structure, is the mineral baddeleyite.
• Zircon and baddeleyite incorporate uranium atoms into their crystalline structure as substitutes for zirconium, but strongly reject lead.
• Baddeleyite forms in igneous rocks low in silica, it can be found in rocks containing potassium feldspar and plagioclase.
• It occurs as interstitial grains with zirconolite, baddeleyite, and apatite associated with late stage intergrowths of quartz and feldspar.
• Baddeleyite's structure is a combination of tetrahedrally coordinated oxide ions parallel to ( 100 ) with triangular coordinated oxide ions.
• This is because baddeleyite tends to become zircon where there is higher silica content, hence why both minerals can be found together.
• Baddeleyite is commonly found with zircon ( ZrSiO 4 ), yet it forms in places with lower silica content, such as mafic rocks.
• Secondary ( metamorphic ) minerals include chlorite, amphibole, sodic plagioclase, quartz, iron oxides and rarely phlogopite, baddeleyite, and pyrope or hydrogrossular garnet.
• They have a chunky, blocky appearance, exhibit a layered structure with abundant vesicles, and contain mineral inclusions, such as zircon, baddeleyite, chromite, rutile, corundum, cristobalite and coesite.
• Baddeleyite is a refractory mineral, with a melting point of 2700 癈 . Hafnium is a substituting " impurity " and may be present in quantities ranging from 0.1 to several percent.
• Uranium-lead dating is often performed on the mineral zircon ( ZrSiO 4 ), though it can be used on other materials, such as baddeleyite, as well as monazite ( see : monazite geochronology ).
• As an example the Palabora complex of South Africa has produced significant copper ( as chalcopyrite, bornite and chalcocite ), apatite, vermiculte along with lesser magnetite, linnaeite ( cobalt ), baddeleyite ( zirconium-hafnium ), and by-product gold, silver, nickel and platinum.
• Titanium dioxide has eight modifications  in addition to rutile, anatase, and brookite, three metastable phases can be produced synthetically ( tetragonal and orthorombic ), and five high-pressure forms ( ?-PbO 2-like, baddeleyite-like, cotunnite-like, orthorhombic OI, and cubic phases ) also exist: