| 21. | Phenocrysts in the rocks contain clinopyroxene, olivine, orthopyroxene and phlogopite.
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| 22. | Basanites contain more olivine and less plagioclase / pyroxene phenocrysts.
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| 23. | Ida's regolith is composed of the silicate minerals olivine and pyroxene.
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| 24. | Magnesium-rich olivine ( forsterite ) favors production of magnesite from peridotite.
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| 25. | Watchtower class rocks lack olivine consequently they may have been altered by water.
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| 26. | The satellite cones have erupted olivine-containing basalts.
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| 27. | Rocks like olivine or gabbro can be dug up.
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| 28. | Their compositions range from alkali olivine basalt to basanitic.
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| 29. | The latter contain olivine, the former do not.
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| 30. | Localized concentrations of hematite and olivine have been found.
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