Image: <bdi><a href="https://www.wikidata.org/wiki/Q56247090" class="extiw" title="d:Q56247090"><span title="mineral collector and dealer">Robert M. Lavinsky</span></a></bdi> (CC BY-SA 3.0)
cubicuncommonSilicates (Feldspathoid, Sodalite group)
Hauyne
(Na,Ca)4-8[Al6Si6O24](SO4,S,Cl)1-2
This specimen features vibrant, well-formed, deep blue hauyne crystals embedded within a dark, fine-grained volcanic matrix.
Hauyne Physical Properties
Mohs Hardness
5.5Crystal System
cubicLuster
vitreousStreak Color
white to pale blueCleavage
distinct on {110}Fracture
conchoidal to unevenSpecific Gravity
2.45Colors
blue, white, gray, green, yellow, red, colorlessTransparency
transparent to translucentType Locality
In den Dellen quarries, Niedermendig, Mendig, Laach lake volcanic complex, Eifel Mts, Rhineland-Palatinate, GermanyMineral Group
Silicates (Feldspathoid, Sodalite group)Uses
jewelry (rarely), collectorAssociated Minerals
leucite, nepheline, augite, sanidine, biotite, titanite, apatite, magnetiteRarity
uncommonGeological Context
Hauyne typically forms in silica-undersaturated igneous rocks, such as phonolites and tephrites, often found in volcanic ejecta or lava flows. Its presence indicates a magma low in silica and rich in alkalis.
