| 21. | It crystallizes in the orthorhombic system, but only rarely forms distinct crystals.
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| 22. | All minerals of the monoclinic, orthorhombic, and triclinic systems are biaxial minerals.
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| 23. | Numerous examples are known with cubic, tetragonal, rhombohedral, and orthorhombic symmetries.
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| 24. | This was eventually explained as a mixture of two orthorhombic phases in the mineral.
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| 25. | The mineral crystallizes in the orthorhombic crystal system.
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| 26. | Its ?-isoform crystallizes into an orthorhombic system with the Cmcm space group.
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| 27. | The framework of stilbite is pseudo-orthorhombic with the open channels typical of zeolites.
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| 28. | The narrower, modern scientific definition for marcasite as orthorhombic iron sulfide dates from 1845.
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| 29. | Teallite forms soft silvery grey mica-like plates and crystallizes in the orthorhombic system.
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| 30. | The mineral has an orthorhombic crystal form.
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