Where is Tourmalinated Quartz found?
Quartz (SiO2) with Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
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Open the appTourmalinated Quartz occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.
Where to find Tourmalinated Quartz
Brazil
Minas Gerais is a significant source, known for high-quality specimens.
United States
Maine and California have notable occurrences, particularly in pegmatite districts.
Madagascar
Known for various quartz and tourmaline varieties, including tourmalinated quartz.
Pakistan
Certain regions yield good quality specimens.
Afghanistan
Similar to Pakistan, known for pegmatite-related minerals.
Collecting tips
- Look in Pegmatites. These coarse-grained igneous rocks are prime environments for both quartz and tourmaline formation.
- Hydrothermal Veins. Explore areas with quartz veins, especially those associated with granitic intrusions.
- Examine Rock Dumps. Old mine dumps from areas known for pegmatites or granite can yield specimens.
- Check for Black Inclusions. Look for dark, often needle-like or columnar inclusions within clear or milky quartz.
Quick Check
- Color:
- Clear to milky quartz with black inclusions.
- Luster:
- Vitreous.
- Streak:
- White (for quartz); colorless (for tourmaline, though rarely tested due to hardness).
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