Where is Schorl found?
Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
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Open the appSchorl 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 Schorl
Brazil
Minas Gerais is a world-renowned source for large, well-formed schorl crystals, particularly in pegmatite deposits.
Pakistan
Northern Areas (e.g., Gilgit-Baltistan) produce excellent quality schorl specimens, often associated with other pegmatite minerals.
United States
Maine (e.g., Mount Mica, Newry), California (e.g., Pala District), and Colorado are known for schorl occurrences in pegmatites.
Namibia
Various localities, including Erongo Region, yield fine schorl crystals.
Afghanistan
Nuristan Province is a significant source of tourmaline, including schorl.
Collecting tips
- Look for Pegmatites. Schorl is most commonly found in granitic pegmatites. Search for areas with exposed pegmatite dikes or veins, often characterized by large crystals of quartz, feldspar, and mica.
- Identify Associated Minerals. Schorl often occurs with quartz, feldspar (orthoclase, albite), muscovite, biotite, and sometimes garnet or beryl. The presence of these minerals can indicate a favorable environment.
- Check for Striations. The characteristic vertical striations on the prism faces are a key identifier. Look for these parallel lines running along the length of the crystal.
- Examine Crystal Shape. Schorl typically forms elongated, columnar crystals. Look for crystals with a distinctive rounded triangular cross-section.
- Safety Precautions. When collecting in pegmatite environments, be aware of unstable rock formations. Always wear appropriate safety gear, including eye protection and gloves. While schorl itself is not hazardous, other minerals in the same environment might be.
Quick Check
- Color:
- Opaque black
- Luster:
- Vitreous to resinous
- Streak:
- White to grayish white
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