Wu et al., "Clinoenstatite
coatings have high bonding strength, bioactive ion release, and osteoimmunomodulatory effects that enhance in vivo osseointegration," Biomaterials, vol.
From minerals occurring in the ash samples taken from the ash fields of power plants the following compounds are present in minor amounts: gypsum CaS[O.sub.4].2[H.sub.2]O, ettringite [Ca.sub.6] [Al.sub.2](S[O.sub.4])3[(OH).sub.12] * 26[H.sub.2]O, magnesite MgC[O.sub.3], dolomite CaMg[(C[O.sub.3]).sub.2], rutile Ti[O.sub.2], monocalcium silicate CaSi[O.sub.3]/CaO?Si[O.sub.2] (wollastonite), dicalcium ferrite [Ca.sub.2] [Fe.sub.2] [O.sub.5]/2CaO * [Fe.sub.2][O.sub.3] (srebrodolskite), monocalcium aluminate Ca[Al.sub.2][O.sub.4]/CaO * [Al.sub.2][O.sub.3], tricalcium aluminate [Ca.sub.3][Al.sub.2] [O.sub.6] /3CaO * [Al.sub.2][O.sub.3], clinoenstatite
MgSi[O.sub.3], and bredigite [Ca.sub.14][Mg.sub.2](Si[O.sub.4])8.
It is the rare pyroxene species clinoenstatite
, from Astore, Nanga Parbat Area near Chilas, Pakistan, and it is very good-looking for a pyroxene: deep blackish green, resembling epidote, in thin-bladed to blocky, sharp crystals to 3 cm long.