Single Brazilian Geode - Cut Polished

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By:geo central




Price is for one (1) Geode

Single Brazilian Cut Polished Geodes 

Looking for something interesting to get your kids or students interested in science? A Single Brazilian Cut Polished Geodes is the perfect solution. This carefully sliced Brazilian geode has been delicately polished to reveal its rich crystal interior. Each half of this beautifully cut geode is filled with crystals. This cut polished Brazilian geode is sure to strike the interest of kids at home or students in science class. They will be amazed at how such an amazing rock was created. Polished geodes are also great for room décor and serve as a great conversation piece.  Each Single Brazilian Cut Polished Geode is around 3 in size. The individual rock comes wrapped in a polly zip lock bag with an informational card providing an educational description of the type of rock included. For a great piece kids and adults alike will enjoy get your very own Single Brazilian Cut Polished Geode!

Size: around 3"

Geodes are geological rock formations which occur in sedimentary and certain volcanic rocks. Geodes are essentially rock cavities or vugs with internal crystal formations or concentric banding. The exterior of the most common geodes is generally limestone or a related rock, while the interior contains quartz crystals and/or chalcedony deposits. Some geodes are completely filled with crystal, being solid all the way through. A geode is a sphere shaped rock which contains a hollow cavity lined with crystals. A geode which is completely filled with small compact crystal formations such as agate, jasper or chalcedony is called a nodule. The only difference between a geode and a nodule is that a geode has a hollow cavity, and a nodule is solid. Geodes begin as bubbles in volcanic rock or as animal burrows, tree roots or mud balls in sedimentary rock. Over time, the outer shell of the spherical shape hardens, and water containing silica precipitation forms on the inside walls of the hollow cavity within the geode. The silica precipitation can contain any variety of dissolved minerals, the most common being quartz, but amethyst and calcite are also found. Over a period of thousands of years, layers of silica cool, forming crystals of different minerals within the cavity. Different types of silica cool at varying temperatures, thus creating layers of different types of mineral crystals. Each geode is unique in composition and can only be truly discovered when cracked open or cut with a rock saw. The size and formation of crystals and different shades of color within the crystals make each geode special. The rough exterior of the geode gives no indication of the secrets held within its core.

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