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Neptunite
Perfect twin of black and lustrous neptunite on white natrolite. Some blue benitoite crystals protrude from the natrolite, the largest measuring 1.2 cm on edge. Neptunite is a mineral which forms two types of twins: The most common is a twin on (301) Miller indices. The rarest twin is that found on (001). There are probably no more than eight or nine of these known. This is the largest twin of neptunite on (001) found to date.
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