(Chiefly of crystals) needle-shaped.
- The acicular crystals are sometimes intergrown or twinned, causing a distortion that results in seemingly single crystals with relatively fat bases tapering to pointed terminations.
- All of the acicular crystals are late Neoproterozoic
- The largest amphibole crystals are embedded in the rock matrix, whereas the smaller acicular crystals line the hollows.
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