igneous
Tourmaline and Mica in Pegmatite
Complex silicate mineral aggregate (Tourmaline subgroup / Muscovite or Biotite mica)
AI-generated identification · may be incorrectMohs hardness 7 to 7.5 for tourmaline, 2 to 2.5 for mica; striations on prismatic tourmaline crystals; vitreous to pearly luster; conchoidal fracture.
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Physical properties
Mohs hardness 7 to 7.5 for tourmaline, 2 to 2.5 for mica; striations on prismatic tourmaline crystals; vitreous to pearly luster; conchoidal fracture.
Formation & geological history
Formed through fractional crystallization in late-stage granitic magmas and hydrothermal pegmatite pockets.
Uses & applications
Used in mineral specimen collecting, lapidary arts, and scientific research into pegmatite genesis.
Geological facts
Pegmatites host some of the largest known mineral crystals in the world, often containing rare elements like lithium and boron.
Field identification & locations
Easily identified by contrasting tabular mica sheets alongside prismatic, striated black or colored tourmaline blades embedded in quartz-feldspar matrix.
