| 1. | Cerussite crystallizes in the orthorhombic system and is isomorphous with aragonite.
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| 2. | Olivine has an orthorhombic structure with a space group of Pbnm.
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| 3. | This mineral is orthorhombic and sphenoidal, exhibiting symmetry on 222.
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| 4. | At 75 GPa it changes to a face-centered orthorhombic structure.
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| 5. | At 100 GPa it changes to a body centered orthorhombic monatomic form.
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| 6. | This soft grey material crystallizes in an orthorhombic space group.
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| 7. | It occurs as prismatic to acicular transparent yellow to white orthorhombic crystals.
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| 8. | It forms opaque silvery white orthorhombic prismatic crystals often exhibiting crystal twinning.
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| 9. | It is a yellow mineral crystallizing in the orthorhombic system.
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| 10. | The crystals often show pseudo orthorhombic forms due to twinning.
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