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Quartz v. Amethyst from Namibia 53028

Currency:USD Category:Collectibles / Rocks, Fossils & Minerals Start Price:300.00 USD Estimated At:600.00 - 1,875.00 USD
Quartz v. Amethyst from Namibia  53028
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An attractive quartz variety amethyst specimen featuring a single, stout, prismatic, purple-colored quartz crystal on a basalt rock matrix which is full of small gas vesicles. Interestingly, this well-formed amethyst crystal grew within a slightly larger gas vesicle (gas cavity) that was created within a basalt flow. This specimen comes from Tafelkop is a small volcanic mountain with a summit elevation of 3,300 feet. Tafelkop is the remnant of a massive volcanic flow called the Entendeka Volcanic Field that once covered the region to a depth of several thousand feet. In parts of the original magma, gas bubbles created voids in the solidifying basalt. With further cooling, contraction created broad networks of cracks and channels throughout the basalt which conveyed silica-rich solutions. Vugs in the basalt sometimes filled with these solutions which then precipitated well-developed quartz crystals in the form of rock crystal, smoky quartz, and amethyst that lined the vugs. The small-scale mining of amethyst has become a local industry for the villagers of Uis. This specimen was formerly in the private mineral collection of Uli and Anka Bahmann. Dimensions (cm): 6.5 H x 7.5 W x 5.5 D. Location: Goboboseb Mts, Brandberg Area, Erongo Region, Namibia City: State: Namibia Date: