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Piedras preciosas de howlita
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Holtite Gemstones
Holtite Gemstones Overview Holtite is an extremely rare semi-precious gemstone known for its unique chemical composition and beautiful colors. It belongs to the dumortierite group and is characterized by its high hardness and complex formula, which includes rare earth elements (REEs). Holtite is named after Harold Edward Holt, the Prime Minister of Australia (1966-1967), and was first discovered in Western Australia. Physical Properties ·         Color: Holtite can exhibit a range of colors, including beige white, brown, greenish, greenish-brown, and light brown. ·         Hardness: On the Mohs scale, holtite ranks at... Leer más
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Piedras preciosas drusas naturales perforadas
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Hodgkinsonite Gemstones
Hodgkinsonite Gemstones Overview Hodgkinsonite is an extremely rare semi-precious gemstone known for its unique chemical composition and vibrant colors. It is primarily composed of zinc, manganese, and silicate, with a chemical formula of Zn2Mn2+(SiO4)(OH)2. This mineral is named after H. H. Hodgkinson, who first identified it in 1913 Physical Properties ·         Color: Hodgkinsonite is known for its vibrant pink to purplish hues, but it can also appear in reddish-brown, orange, yellow, and even black. The color variations are due to the presence of manganese oxide in its composition ·         Hardness:... Leer más
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Piedras preciosas de hiddenita
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Piedras preciosas de hibonita
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