100g Natural Amethyst Skeletal Quartz Point Crystal Cluster
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Amethyst is recognized as the official birthstone for the month of February. Amethyst belongs to the macrocrystalline branch of quartz and owes its violet/purple color to iron and aluminum impurities. Without such coloring agents, amethyst would simply be transparent, ordinary colorless quartz. Like other varieties of macrocrystalline quartz, amethyst has transparent to translucent clarity and a vitreous luster. Cryptocrystalline varieties of quartz almost always occur with translucent to opaque clarity.
Skeletal Quartz crystals often form with a geometric pattern of lines, depressions and raised terminations (related to the quartz crystal structure) etched into their surface. Internally, these crystals exhibit plainly visible cavities in geometric patterns (also related to the quartz crystal structure) which can contain clay minerals of varied colors, sometimes accompanied by carbon dioxide or water. These cavities often have a layered or ribbed aspect and are sometimes so pronounced as to make the crystal almost hollow, giving rise to the term Skeletal Quartz. Occasionally these cavities contain both liquid and gas phases together known as two-phase inclusions. In rare cases, these two-phase inclusions in quartz can be visible to the unaided eye and may show actual movement of the gas phase within the liquid phase (popularly known as Elestial Quartz crystal 'Enhydros').
Skeletal Quartz occurs in vugs or pockets in granitic pegmatites associated with the feldspar varieties microline and albite, and it is occasionally found together with some of the more rare pegmatite minerals such as Lepdiolite & Amblygonite. Skeletal Quartz also occurs occasionally together with some of the rare pegmatite gem varietie such as aquamarine, kunzite, and toumaline. Skeletal quartz is recognized by its unusual etchings and internal cavities.