Tonalite
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Description:
A gray-white matrix of tonalite with 2-5mm xls of hornblende and biotite. It looks like, but differs from, granite by having a higher percentage of quartz (>10%). This material forms the huge (up to 15 meters in diameter) boulders of the south end of Spring Bay, Virgin Gorda, where it was collected.
- Site: West Indies; Virgin Islands
- Site Number: NH6F
- Dimensions: H-13 W-7 D-3 cm
- Rock type: Igneous
- Collection: Geology Collection
- Object Name: Igneous Rock
- Object Id: GR69
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