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||Any of a group of hydrated silicates of aluminum, having sodium, calcium, potassium as their chief metals. Zeolites are often white or colorless, and are remarkable for the ease with which they take up or lose water molecules. Zeolites are often found as crystals in cavities in basalt, and as authigenic minerals in tuffs. Zeolites are valuable economic minerals.
||A hard mineral, ZrSiO4, which is found as an accessory mineral in many kinds of rocks. Zircon is the ore for cubic zirconium, and can be cut and polished to make gemstones (such as artificial diamonds). Zircons are useful geochronometers.
||Small free-floating aquatic animals which are mostly microscopic.
| Zygomatic arch
||The arch formed by the articulation of the broad temporal process of the zygomatic bone and the slender zygomatic process of the temporal bone (Morris 1992).