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Tanzanite Crystal Cluster: A Collector's Guide
Tanzanite is a relatively rare gemstone that is only found in one place on Earth: the Merelani Hills of Tanzania. This beautiful mineral is prized for its deep violet color, which can range from light lavender to a rich purple. Tanzanite is also known for its strong pleochroism, which means that it can appear to change color depending on the angle at which it is viewed.
Tanzanite crystals are typically found in small clusters, and they can range in size from a few millimeters to several centimeters. The most valuable tanzanite crystals are those that are large, well-formed, and have a deep violet color. These crystals are often used in jewelry, while smaller crystals may be used in decorative objects or sold as mineral specimens.
Crystal Structure
Tanzanite is a member of the zoisite mineral group, and it has a chemical formula of Ca2Al3(SiO4)3(OH). The mineral's crystal structure is monoclinic, and it typically forms in prismatic or tabular crystals. Tanzanite crystals are often twinned, and they may exhibit a variety of surface features, such as striations, pits, and etchings.
Color
The most distinctive feature of tanzanite is its deep violet color. This color is caused by the presence of vanadium impurities in the mineral's crystal structure. The amount of vanadium present in a tanzanite crystal will determine the intensity of its color. Tanzanite crystals that are heated during the mining process may lose some of their vanadium content, which can result in a lighter color.
Pleochroism
Tanzanite is a strongly pleochroic mineral, which means that it can appear to change color depending on the angle at which it is viewed. This is due to the fact that the mineral's crystal structure absorbs light of different wavelengths in different directions. When viewed from one direction, tanzanite may appear to be a deep violet color, while when viewed from another direction, it may appear to be blue or even green.
Clarity
Tanzanite crystals are typically translucent to opaque. The most valuable tanzanite crystals are those that are transparent and free of inclusions. Inclusions are tiny flaws or imperfections that can occur within a crystal. Inclusions can affect the clarity and beauty of a tanzanite crystal, and they can also reduce its value.
Mohs Hardness
Tanzanite has a Mohs hardness of 6.5, which means that it is a relatively hard mineral. However, it is still important to take care when handling tanzanite jewelry, as it can be scratched or damaged if it is not properly protected.
Care and Cleaning
Tanzanite is a delicate gemstone that requires special care and cleaning. To clean tanzanite jewelry, use a mild detergent and warm water. Avoid using harsh chemicals or ultrasonic cleaners, as these can damage the mineral. Tanzanite should also be stored in a cool, dark place, away from direct sunlight.
Conclusion
Tanzanite is a beautiful and rare gemstone that is prized by collectors and jewelry lovers alike. Its deep violet color, strong pleochroism, and unique crystal structure make it a truly special mineral. If you are looking for a unique and eye-catching gemstone, tanzanite is a great option.