| 31. | It is a purple crystal adopting monoclinic crystal system.
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| 32. | Crystal systems formed from identical atoms follow several spherical packing patterns ( crystal structures ).
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| 33. | It is an example of a hexagonal crystal system.
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| 34. | The crystal system is monoclinic 2 / m.
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| 35. | The mineral crystallizes in the triclinic crystal system.
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| 36. | The mineral crystallizes in the orthorhombic crystal system.
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| 37. | The crystal system of the mineral is hexagonal.
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| 38. | In one-dimensional space, there is one crystal system.
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| 39. | Quartz belongs to the trigonal crystal system.
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| 40. | Botallackite crystallises in the monoclinic crystal system.
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