Haüyne - (Na,Ca)4-8Al6Si6(O,S)24(SO4,Cl)1-2

Haüyne is a feldspathoid and a member of the sodalite group. It was tentatively named latialite in 1803 by Carlo Giuseppe Gismondi for the locality at Campagna (Latium) without formal publication. Named in 1807 by Toennes Christian Bruun de Neergaard, in honor of abbé Rene Just Haüy ("Father of crystallography"). Named also berzeline in 1831 by Louis Albert Necker de Saussiere, in honor of Joens Jakob Berzelius. The mineral was temporarily named hauynite by James Dwight Dana in 1868.

The sodalite group minerals have a structure based on a cubic structure, which is a tectosilicate framework, of SiO4 and AlO4 tetrahedra linked together. The structure is characterized by large cavities, which accommodate large anions (Cl-, S2-, SO42-) surrounded by Na+ or Ca+ in tetrahedral coordination. The large anions and cations distinguish minerals of the sodalite group:

• Sodalite Na8Al6Si6O24Cl2
• Hackmanite Na8Al6Si6O24(Cl,S)2
• Nosean Na8Al6Si6O24(SO4)
• Haüyne (Na,Ca)8-4Al6Si6O24(SO4)1-2
• Lazurite (Na,Ca)8Al6Si6O24(SO4,S,Cl)2

Haüyne occurs in phonolites and related leucite- or nepheline-rich, silica-poor, igneous rocks; less commonly in nepheline-free extrusives and in some metamorphic rocks (i.e marble).

Optical properties:
• Color: Colorless or pale blue.
• Habit: normally forms euhedral dodecahedron crystals yielding hexagonal section. Six, eight and ten-sided cross sections are very common. Rounded corners and corroded, curved and embayed faces are typical.
• Relief: Low, moderate negative.
• Birefringence: Isotropic.
• Special characteristics: Dark rims and exolution inclusions of sub-microscopic Fe-sulphides and Fe-oxides are concentrically arranged ore define linear patterns.

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Panoramic view of haüyne foidite thin section. Image by Andy Tindle (Virtual Microscope). PPL image, field of view = 2.5cm.



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Panoramic view of haüyne foidite thin section. Image by Andy Tindle (Virtual Microscope). XPL image, field of view = 2.5cm.



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Blue haüyne crystal in pumice. Nickenicher Sattel, Rhineland-Palatinate, Germany.



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Blue haüyne crystal in pumice. Nickenicher Sattel, Rhineland-Palatinate, Germany.



Bibliography



• Deer, W.A., Howie, R.A., Zussman, J. (1998) Rock-forming Minerals.
• Optical Mineralogy : The Nonopaque Minerals by Phillips / Griffen
• E. WM. Heinrich (1956): Microscopic Petrografy. Mcgraw-hill book company,inc


Photo
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Haüyne phenocryst in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 2x (Field of view = 7mm)
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Haüyne phenocryst in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 2x (Field of view = 7mm)
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Haüyne phenocryst in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 2x (Field of view = 7mm)
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Haüyne phenocryst in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 2x (Field of view = 7mm)
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Haüyne phenocryst in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 2x (Field of view = 7mm)
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Exolution inclusions in Haüyne. PPL image , 20x (Field of view = 0.5mm)
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Exolution inclusions in Haüyne. PPL image , 20x (Field of view = 0.5mm)
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Dark rims and exolution inclusions concentrically arranged in Haüyne. PPL image , 20x (Field of view = 0.5mm)
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Exolution inclusions in Haüyne. PPL image , 20x (Field of view = 0.5mm)
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Haüyne phenocrysts in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 2x (Field of view = 7mm)
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Haüyne phenocrysts in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 2x (Field of view = 7mm)
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Haüyne phenocrysts in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 2x (Field of view = 7mm)
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Haüyne phenocrysts in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 2x (Field of view = 7mm)
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Haüyne phenocrysts in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 2x (Field of view = 7mm)
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Haüyne phenocrysts in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 2x (Field of view = 7mm)
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Haüyne phenocrysts in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 2x (Field of view = 7mm)
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Haüyne phenocrysts in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 2x (Field of view = 7mm)
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Haüyne phenocrysts in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 2x (Field of view = 7mm)
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Haüyne phenocrysts in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 2x (Field of view = 7mm)
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Haüyne phenocrysts in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 2x (Field of view = 7mm)
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Haüyne phenocrysts alterd by fibrolitic Zeolite aggregates. XPL image , 2x (Field of view = 7mm)
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Haüyne phenocrysts alterd by fibrolitic Zeolite aggregates. XPL image , 2x (Field of view = 7mm)
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Haüyne phenocrysts alterd by fibrolitic Zeolite aggregates. XPL image , 2x (Field of view = 7mm)
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Haüyne phenocrysts alterd by fibrolitic Zeolite aggregates. XPL image , 10x (Field of view = 2mm)
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Haüyne phenocryst in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 10x (Field of view = 2mm)
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Haüyne phenocryst in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 10x (Field of view = 2mm)
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Haüyne phenocryst in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 10x (Field of view = 2mm)
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Haüyne phenocryst in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 10x (Field of view = 2mm)
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Haüyne phenocryst in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 10x (Field of view = 2mm)
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Haüyne phenocryst in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 10x (Field of view = 2mm)
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Exolution inclusions in Haüyne. PPL image , 10x (Field of view = 2mm)
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Exolution inclusions in Haüyne. PPL image , 10x (Field of view = 2mm)
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Exolution inclusions in Haüyne. PPL image , 10x (Field of view = 2mm)
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Exolution inclusions in Haüyne. PPL image , 2x (Field of view = 7mm)
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Exolution inclusions in Haüyne. PPL image , 2x (Field of view = 7mm)
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Exolution inclusions in Haüyne. PPL image , 2x (Field of view = 7mm)
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Exolution inclusions in Haüyne. PPL image , 20x (Field of view = 0.5mm)
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Exolution inclusions in Haüyne. PPL image , 20x (Field of view = 0.5mm)
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Exolution inclusions in Haüyne. PPL image , 20x (Field of view = 0.5mm)
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Haüyne phenocrysts in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 10x (Field of view = 2mm)
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Haüyne phenocrysts in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 10x (Field of view = 2mm)
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Haüyne phenocrysts in a Haüyne foidite from Melfi (Potenza, Italy). XPL image , 10x (Field of view = 2mm)
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Fenocristalli di Haüyna in una foidite ad Haüyna proveniente da Melfi (Potenza). Immagine a N//, 10x (lato lungo = 2mm)
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Fenocristalli di Haüyna in una foidite ad Haüyna del Vulture. Immagine a N//, 10x (lato lungo = 2mm)
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Fenocristalli di Haüyna in una foidite ad Haüyna del Vulture. Immagine a N//, 10x (lato lungo = 2mm)
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Haüyne phenocrysts in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 10x (Field of view = 2mm)
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Haüyne phenocrysts in a Haüyne foidite from Melfi (Potenza, Italy). ZPL image , 10x (Field of view = 2mm)
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Haüyne phenocrysts in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 10x (Field of view = 2mm)
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Haüyne phenocrysts in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 10x (Field of view = 2mm)
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Haüyne phenocrysts in a Haüyne foidite from Melfi (Potenza, Italy). XPL image , 10x (Field of view = 2mm)
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Haüyne phenocrysts in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 10x (Field of view = 2mm)
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Haüyne and pyroxene phenocrysts in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 10x (Field of view = 2mm)
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Haüyne and pyroxene phenocrysts in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 10x (Field of view = 2mm)
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Haüyne and pyroxene phenocrysts in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 10x (Field of view = 2mm)
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Haüyne and pyroxene phenocrysts in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 10x (Field of view = 2mm)
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Haüyne and Leucite phenocrysts in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 10x (Field of view = 2mm)
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Haüyne and Leucite phenocrysts in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 10x (Field of view = 2mm)
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Haüyne, clinpyroxene and leucite phenocrysts in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 2x (Field of view = 7mm)
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Haüyne, clinpyroxene and leucite phenocrysts in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 2x (Field of view = 7mm)
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Haüyne, clinpyroxene and leucite phenocrysts in a Haüyne foidite from Melfi (Potenza, Italy). PPL image , 2x (Field of view = 7mm)
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Haüyne and Augite phenocrysts ina foidite from Cape verde. PPL image , 2x (Field of view = 7mm)
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Haüyne and Augite phenocrysts ina foidite from Cape verde. PPL image , 2x (Field of view = 7mm)
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Haüyne and Augite phenocrysts ina foidite from Cape verde. PPL image , 2x (Field of view = 7mm)
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Haüyne and Augite phenocrysts ina foidite from Cape verde. PPL image , 2x (Field of view = 7mm)
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Haüyne and Augite phenocrysts ina foidite from Cape verde. PPL image , 2x (Field of view = 7mm)
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Haüyne and Augite phenocrysts ina foidite from Cape verde. PPL image , 2x (Field of view = 7mm)
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Haüyne magnetite and Augite phenocrysts ina foidite from Cape verde. PPL image , 2x (Field of view = 7mm)
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Haüyne and Augite phenocrysts ina foidite from Cape verde. XPL image , 2x (Field of view = 7mm)