haüyne

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haüyne

[ä′wēn]
(mineralogy)
(Na,Ca)4-8(Al6Si6O24)(SO4,S)1-2An isometric silicate mineral of the sodalite group occurring as grains embedded in various igneous rocks; hardness is 5.5-6 on Mohs scale, and specific gravity is 2.4-2.5. Also known as haüynite.
References in periodicals archive ?
The predominant crystal form for all four species is the dodecahedron, as illustrated by the nosean crystal on biotite in Figure 2 and the beautiful, blue hauyne crystal in Figure 3.
The four species have an amazing propensity to form twins such as those of sodalite from Monte Somma, hauyne from Mendig in the Eifel District, and nosean from the Alban Hills shown in Figures 6-8, respectively.
These crystals show several orders of dipyramids, and are associated with green hauyne crystals (identified by IR, XRD and chemical analyses).
He also tends to have lots of rare species and occasionally fine cut hauynes.