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This example shows both sector and concentric zoning in hydrothermal vein quartz, possibly due to Al variation. The sample has been polished flat and is viewed looking down the (0001) axis. The sector zoning appears related to the positive and negative rhomb orientations and may have potential therefore for indicating dauphine twinning. Note that the true trigonal symmetry at the very centre has been replaced quickly by a pseudo-hexagonal symmetry throughout much of the grain.