Where is Tourmalinated Quartz found?
Quartz with Schorl (Black Tourmaline) inclusions
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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, particularly for high-quality specimens with clear quartz and well-formed tourmaline needles.
Madagascar
Known for producing various quartz varieties, including tourmalinated quartz.
United States
Localities in Maine, California, and other pegmatite-rich areas.
Pakistan
Certain regions yield specimens with good clarity and tourmaline inclusions.
Afghanistan
Similar to Pakistan, known for pegmatite-related mineral occurrences.
Collecting tips
- Geological Context. Look for tourmalinated quartz in areas known for pegmatite intrusions or hydrothermal vein deposits, especially those associated with granitic rocks.
- Visual Identification. Identify clear to milky quartz crystals containing distinct black, needle-like or prismatic inclusions. The inclusions should be visibly embedded within the quartz, not merely attached to the surface.
- Hardness Test. The quartz component will scratch glass (Mohs hardness 7). The tourmaline inclusions are slightly softer (Mohs hardness 7-7.5), but still hard.
- Associated Minerals. Often found with other pegmatite minerals such as feldspar, mica, and other tourmaline varieties.
Quick Check
- Color:
- Clear to milky quartz with black needle-like inclusions.
- Luster:
- Vitreous (glassy).
- Streak:
- White (for quartz), colorless (for tourmaline, though typically not tested due to hardness).
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