CRYSTALS2COLLECT A.C.N 651.525.727 Pty Ltd
TOPAZ imperial, COLOUR SHERRY, RHYOLITE
TOPAZ imperial, COLOUR SHERRY, RHYOLITE
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Topaz is a silicate mineral composed of aluminum and fluorine, represented by the chemical formula Al2SiO4(F, OH)2. It serves as a popular gemstone in jewelry and decorative items. While natural topaz is typically colorless, impurities can impart hues ranging from pale blue to golden brown or yellow-orange. Additionally, treatments involving heat or radiation can enhance its color to deep blue, reddish-orange, pale green, pink, or purple.
As a nesosilicate and specifically an aluminosilicate mineral, topaz ranks among the hardest naturally occurring minerals and features a relatively low refractive index. It crystallizes in the orthorhombic system and exhibits a dipyramidal crystal class. Topaz is found in various locations worldwide, with Brazil and Russia being notable sources, and is commonly extracted through open-pit or alluvial mining methods.
Rhyolite is the volcanic rock with the highest silica content. Typically, it exhibits a glassy or fine-grained texture, although it can also be porphyritic, featuring larger mineral crystals known as phenocrysts embedded in a finer-grained matrix. The primary minerals found in rhyolite include quartz, sanidine, and plagioclase, making it the extrusive counterpart to granite.
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