magnetite (Fe 3O 4), the black oxide of iron. In comparison, rust, the red oxide of iron (Fe 2O 3), undergoes an extremely large volume change upon hydration;...

then requires extra cations. For example, in the mineral orthoclase [KAlSi 3O 8] n, the anion is a tridimensional network of tetrahedra in which all oxygen...

NaAlSi3O8 oligoclase (10 to 30) (Na,Ca)(Al,Si)AlSi2O8 andesine (30 to 50) NaAlSi 3O 8 – CaAl 2Si 2O 8 labradorite (50 to 70) (Ca,Na)Al(Al,Si)Si2O8 bytownite (70...

5 million pounds) of triuranium octoxide (U 3O 8) at an average grade of 15.92%, for 75,070 tonnes of U 3O 8, and a measured and indicated resource of...

than 10% anorthite content. The pure albite endmember has the formula NaAlSi 3O 8. It is a tectosilicate. Its color is usually pure white, hence its name...

Suzana Lucy Nixdorf and Isidro Hermosín-Gutiérrez, Analytica Chimica Acta, Volume 659, Issues 1-2, 5 February 2010, Pages 208-215, doi:10.1016/j.aca.2009...

water molecules form one hydroxide anion (OH− ) and one hydronium cation (H 3O+ ). Because of autoionization, at ambient temperatures pure liquid water has...

the middle school is known as 2nd and 3rd cycles of basic education (2º e 3º ciclos do ensino básico). It comprises the 5th till 9th year of compulsory...

purple to rusty red. The iron is usually found in the form of magnetite (Fe 3O 4, 72.4% Fe), hematite (Fe 2O 3, 69.9% Fe), goethite (FeO(OH), 62.9% Fe),...

reacts with the iron metal producing hydrogen and iron cations: Fe + 2 H 3O+ → Fe2+ + H 2 + 2 H 2O The reaction consuming protons raises the pH of the...