haüyne
oxford
views updated May 08 2018haüyne A feldspathoid and member of the sodalite group of minerals, formula (Na,Ca)4–8(Al6Si6O24)(SO4,S)1–2; sp. gr. 2.5; hardness 5.5; greyish-white; granular; occurs as a constituent of alkali volcanic rocks, often with pyrite.
A Dictionary of Earth Sciences AILSA ALLABY and MICHAEL ALLABY
vishnevite
oxford
views updated May 08 2018vishnevite See CANCRINITE.
A Dictionary of Earth Sciences AILSA ALLABY and MICHAEL ALLABY