| 21. | It is a dark grey metallic mineral which forms acicular prismatic monoclinic crystals.
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| 22. | It is monoclinic with a body centered lattice similar to those of anorthite.
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| 23. | Anhydrous is a monoclinic crystal with slightly sulfuric odor.
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| 24. | Phenyllithium is an organolithium compound that forms monoclinic crystals.
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| 25. | Pumpellyite crystallizes in the monoclinic-prismatic crystal system.
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| 26. | It is a soft, dark grey telluride mineral which forms monoclinic crystals.
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| 27. | It crystallizes in the monoclinic-prismatic crystal system.
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| 28. | It crystallizes as monoclinic prisms which occur as apple green acicular radiating clusters.
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| 29. | It is a soft yellowish white mineral which crystallizes in the monoclinic system.
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| 30. | Crystals are tetragonal, though commonly deformed to the extent of appearing monoclinic.
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