metamorphic
Ptygmatic Migmatite
Migmatite (consisting of Neosome and Paleosome fractions)
Hardness: 6-7 on Mohs scale; Color: Gray matrix with white/pink veins; Luster: Vitreous to dull; Structure: Highly folded ptygmatic veins; Composition: Quartz, feldspar, and mica.
- Hardness
- 6-7 on Mohs scale
- Color
- Gray matrix with white/pink veins
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Gray matrix with white/pink veins; Luster: Vitreous to dull; Structure: Highly folded ptygmatic veins; Composition: Quartz, feldspar, and mica.
Formation & geological history
Formed under extreme metamorphic conditions of high temperature and pressure where partial melting occurs. This specimen features ptygmatic folding, representing highly ductile deformation of granitic melt during peak metamorphism.
Uses & applications
Primarily used as decorative stone, countertops, and high-end landscaping. Highly valued in teaching geology and by mineral collectors for its complex structural history.
Geological facts
The word migmatite comes from the Greek 'migma', meaning mixture. These rocks represent the bridge between metamorphic rocks and igneous granites, capturing the very moment a rock begins to melt.
Field identification & locations
Identified by its 'mixed' appearance of a dark metamorphic host rock and wavy, folded light-colored igneous veins. Found in deeply eroded Precambrian shields and root zones of ancient mountain belts like the Canadian Shield or the Appalachians.
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