igneous
Munkrudite
Alkali feldspar syenite
AI-generated identification · may be incorrectHardness 6 on Mohs scale; distinctive orange-red feldspar and dark green-grey aegirine streaks in a fine-grained crystalline matrix; vitreous to greasy luster.
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Physical properties
Hardness 6 on Mohs scale; distinctive orange-red feldspar and dark green-grey aegirine streaks in a fine-grained crystalline matrix; vitreous to greasy luster.
Formation & geological history
Formed through the cooling and crystallization of alkaline magma in intrusive complexes, dating to the Proterozoic eon.
Uses & applications
Primarily collected as a rare decorative ornamental stone and prized by petrologists for alkaline magmatic studies.
Geological facts
Named after its type locality near Munkrud in Värmland, Sweden, this unusual rock exhibits striking colors due to localized alkali metasomatism.
Field identification & locations
Identify by its vivid orange and dark green mottled appearance and lack of quartz; found mainly in Scandinavian alkaline provinces.
