Atomistry » Aluminium » Chemical properties » Hauynite
Atomistry »
  Aluminium »
    Chemical properties »
      Hauynite »

Hauynite, Na2Ca(NaSO4Al)Al2(SiO4)3

Hauynite, Na2Ca(NaSO4Al)Al2(SiO4)3, is also a blue, cubic mineral, isomorphous with sodalite, with which it is often associated. Hauynite is of interest as being one of the very few silicates which contain sulphur.

Lapis-lazuli is a beautiful blue substance found in Persia, Afghanistan, Siberia, and Chili, and has been prized for ages as an ornamental stone. Density, 2.38 to 2.42; hardness, 5.5. It occurs embedded in limestone, from which it is extracted by heating the limestone and then breaking out the lapis-lazuli with a hammer. Lapis-lazuli was formerly supposed to be a simple mineral, but Brogger and Backstrom have shown it to be a rock, consisting of diopside, amphibole, muscovite, calcite, pyrite, and a blue, cubic mineral to which they gave the name lazurite. Lazurite is a sodium-aluminium silicate containing both sulphur and chlorine, and is regarded as being closely analogous and isomorphous with sodalite and haiiynite. Powdered lazurite constitutes the natural pigment ultramarine.

Last articles

Ca in 5ZZN
Ca in 6A48
Ca in 6A4K
Ca in 6A4Y
Ca in 6A46
Ca in 6A2W
Ca in 6A12
Ca in 5ZZ1
Ca in 6A0K
Ca in 5ZZ0
© Copyright 2008-2020 by atomistry.com
Home   |    Site Map   |    Copyright   |    Contact us   |    Privacy