Hauyne
Image: Robert M. Lavinsky (CC BY-SA 3.0)
Mineral NameHauyne
Chemical Formula(Na,Ca)4-8Al6Si6O24(SO4,S,Cl)1-2
Mohs Hardness5.5
Crystal Systemcubic
Lustervitreous
Streak Colorwhite to pale blue
Cleavagedistinct on {110}
Fractureconchoidal
Specific Gravity2.45
Colorsblue, white, gray, green, yellow, red
Transparencytransparent to translucent
Type LocalityMayen, Eifel Mts, Rhineland-Palatinate, Germany
Mineral GroupSilicates (Feldspathoid, Sodalite Group)
Usescollector, gemstone
Associated Mineralsnepheline, leucite, augite, sanidine, phlogopite
Rarityuncommon
Description
This image displays a small, vivid blue, euhedral crystal of Hauyne, likely exhibiting a dodecahedral or pseudo-dodecahedral habit.
Geological Context
Hauyne is a rare feldspathoid mineral typically found in silica-undersaturated alkaline igneous rocks, such as phonolites and tephrites. It forms during the late stages of magmatic crystallization in these volcanic environments.
