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Calcite (Iceland spar)
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Calcite (Iceland spar)
A specimen of Iceland spar from Rodefjord, Iceland. Transparent crystal composed of the mineral, calcite (calcium carbonate) which has unusual property of double refraction
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Media ID 8581227
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Calcite Calcite Group Calcium Carbonate Carbonate Mineral Greenland Iceland Mineral North America Spar Transparent
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EDITORS COMMENTS
In this photograph, a stunning specimen of Iceland spar, a transparent calcite crystal, takes center stage. Hailing from the shores of Rodefjord in Iceland, this natural wonder showcases the unique and intriguing property of double refraction. Calcite, a mineral composed primarily of calcium carbonate, is a member of the calcite group and is commonly found throughout the world, including North America and Europe. However, it is the Iceland spar variety that captivates the imagination with its remarkable ability to split light into two rays as it passes through the crystal. This phenomenon, known as birefringence, is a result of the crystal's unique internal structure, with two distinct refractive indices. The double refraction effect is most pronounced when the crystal is viewed against a contrasting background, such as a dark surface or a polarized light source. The crystal's transparency adds to its allure, allowing viewers to peer deep into its intricate, internal structure. The greenish hue visible in the photograph is a result of trace impurities within the crystal. Iceland spar has long been a subject of fascination for scientists, collectors, and artists alike, inspiring numerous studies and applications in various fields, from optics to mineralogy. This photograph, with its crisp detail and vibrant colors, offers a captivating glimpse into the beauty and complexity of the natural world. The Iceland spar specimen, with its double refraction properties, serves as a testament to the wonders that can be discovered when we take the time to explore the intricacies of the world around us.
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