Where is Tourmalinated Quartz found?
Schorl in Quartz
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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 prolific source, producing high-quality specimens with clear quartz and well-formed schorl inclusions.
United States
Maine (e.g., Mount Mica, Plumbago Mountain) and California (e.g., Pala District) are known for tourmaline-bearing pegmatites, including schorl in quartz.
Pakistan
Northern areas, particularly Gilgit-Baltistan, yield fine specimens.
Madagascar
Various localities produce tourmaline-bearing pegmatites.
Afghanistan
Known for its diverse tourmaline occurrences, including schorl in quartz.
Collecting tips
- Geological Context. Focus on areas known for pegmatites, granitic intrusions, and hydrothermal vein systems. Look for outcrops with coarse-grained igneous or metamorphic rocks.
- Visual Identification. Search for transparent to translucent quartz crystals or masses containing distinct black, needle-like or prismatic inclusions. The contrast is usually quite evident.
- Associated Minerals. Often found with other pegmatite minerals such as feldspar, mica (muscovite, biotite), garnet, and other tourmaline varieties.
- Tools. A rock hammer, chisel, and safety glasses are essential for collecting. A hand lens can help examine the inclusions more closely.
Quick Check
- Color:
- Clear to smoky quartz with black inclusions.
- Luster:
- Vitreous.
- Streak:
- White (for quartz), colorless (for schorl, though typically not tested due to hardness).
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