| 11. | The crystal system is orthorhombic and is flat and tabular in appearance.
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| 12. | At higher temperatures the crystals take on triclinic to orthorhombic.
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| 13. | It crystallizes in the orthorhombic system with a space group of Pcab.
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| 14. | Columbite has the same composition and crystal symmetry ( orthorhombic ) as tantalite.
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| 15. | The mineral is said to be pseudo-orthorhombic.
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| 16. | Autunite crystallizes in the orthorhombic system and often occurs as tabular square crystals.
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| 17. | It crystallizes in the orthorhombic dipyramidal system and is typically massive in habit.
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| 18. | It has a conchoidal, uneven fracture, and an orthorhombic crystal system.
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| 19. | Two phases exist the hexagonal SnSe 2 phase and the orthorhombic SnSe phase.
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| 20. | It belongs in the biaxial group, because it is an orthorhombic mineral.
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