pinacoid


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pinacoid

(ˈpɪnəˌkɔɪd)
n
1. (Chemistry) one of a pair of opposite parallel faces of a crystal
2. (Chemistry) a crystal that contains a pair of opposite parallel faces
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Gmelinite is generally pink and vitreous with well formed colourless hexagonal dipyramid, prism and pinacoid crystals (Fig.