Where is Tourmalinated Quartz, Schorl in Quartz found?
Schorl (black tourmaline) in Quartz
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Open the appTourmalinated Quartz, Schorl in 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, Schorl in Quartz
Brazil
Minas Gerais is a significant source, known for high-quality specimens with clear quartz and well-formed schorl needles.
Madagascar
Produces specimens with varying densities of tourmaline inclusions.
United States
Localities in Maine, California, and Colorado yield tourmalinated quartz, often from pegmatite deposits.
Pakistan
Known for specimens with distinct black tourmaline needles in clear quartz.
Afghanistan
Similar to Pakistan, producing good quality material.
Collecting tips
- Geological Context. Look for tourmalinated quartz in areas known for pegmatites, granite intrusions, or hydrothermal vein systems. These environments provide the necessary conditions for both quartz and tourmaline crystallization.
- Associated Minerals. It is often found alongside other pegmatitic minerals such as feldspar, mica (muscovite, biotite), and sometimes other tourmaline varieties or beryl.
- Visual Identification. The distinctive black needles or prisms embedded in a translucent to opaque quartz matrix are usually easy to spot. Examine outcrops and stream beds in promising areas.
- Hardness Test. Quartz (Mohs 7) is harder than most common rock-forming minerals, and schorl (Mohs 7-7.5) is also quite hard. This can help differentiate it from softer inclusions.
Quick Check
- Color:
- Clear, white, or smoky quartz with black inclusions.
- Luster:
- Vitreous (glassy).
- Streak:
- White (for quartz), black (for schorl, though typically not powdered for streak test).
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