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Quartz is formed in many different ways and occurs in many igneous and metamorphic rocks, particularly in granite and gneiss, and it is abundant in clastic sediments. It is also a common gauge mineral in mineral veins, and most good crystals are found in this type of occurrence. Well-formed quartz crystals can be obtained from cavities (geodes), from granite porphyries and from granite pegmatites. Because it resists weathering, quartz is also found in alluvial sands and gravels. There are two main varieties of quartz: crystalline quartz, which is discussed here, and cryptocrystalline quartz, in which the crystals are so small as. to be microscopic. This latter group includes amongst others CHALCEDONY, AGATE, JASPER, 0Nyx and CARNELIAN. What is remarkable about crystalline quartz is the variety in which it is found. It occurs in a range of colours, from clear ROCK CRYSRAL to pink ROSE QUARTZ or purple AMETHYST, to dark SMOKY QUARTZ.