This is because baddeleyite tends to become zircon where there is higher silica content, hence why both minerals can be found together.
12.
Baddeleyite is commonly found with zircon ( ZrSiO 4 ), yet it forms in places with lower silica content, such as mafic rocks.
13.
Secondary ( metamorphic ) minerals include chlorite, amphibole, sodic plagioclase, quartz, iron oxides and rarely phlogopite, baddeleyite, and pyrope or hydrogrossular garnet.
14.
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.
15.
Baddeleyite is a refractory mineral, with a melting point of 2700 �C . Hafnium is a substituting " impurity " and may be present in quantities ranging from 0.1 to several percent.
16.
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 ).
17.
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.
18.
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:
