| 31. | Huntite crystallizes in the trigonal system and typically occurs as platy crystals and powdery masses.
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| 32. | In this structure, nickel is octahedral and the selenides are in trigonal prismatic sites.
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| 33. | There are three special case geometries of the " diminished trigonal trapezohedron ".
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| 34. | Two are in approximate tetragonal pyramids and the third is essentially a trigonal bipyramidal coordination.
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| 35. | Magnesite consists of white trigonal crystals.
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| 36. | If the crystal system is not trigonal then the lattice system is of the same type.
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| 37. | Smithsonite is a variably colored trigonal mineral which only rarely is found in well formed crystals.
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| 38. | It has a trigonal pyramidal shape.
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| 39. | The crystal system is a trigonal-rhombohedral class 3 and has space group of R.
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| 40. | Why can't trigonal bipyramids?
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