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Variscite necklace found in excavations around the Gava variscite mines which were active between 4200 and 3400 BCE (Neolithic period) in Barcelona C
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Variscite semi-precious mineral
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Sandstone tool used to shape and grind variscite between 4200 and 3400 BCE (Neolithic period) in Gava Mines Barcelona Catalonia Spain Variscite (s
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Neolithic Gava Mines Barcelona Catalonia Spain This is a prehistoric site where variscite was mined Variscite is a semi-precious green mineral wh
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Gava Neolithic Mines Archaeological Park
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Turquoise stones Polished stones of the mineral turquoise (hydrated copper aluminium phosphate) These opaque gemstones are cryptocrystalline meanin
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Turquoise a rare opaque mineral and ornamental stone It is a hydrated copper- aluminium phosphate This polished sample measuring 45 millimetres ac
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Turquoise gemstone Close-up of the veins within turquoise (hydrated copper aluminium phosphate) the most valuable non-transparent gemstone Its name
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Variscite is a semi-precious stone used widely in jewellery It is formed from hydrated aluminium phosphate The best stones come from central North A
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Turquoise gemstones Turquoise (hydrated copper aluminium phosphate) is the most valuable non- transparent gemstone Its name although now related to
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Turquoise Polished stones of the precious mineral turquoise (hydrated copper aluminium phosphate) These opaque gemstones are cryptocrystalline mean
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The mineral turquoise is a hydrated copper-aluminium phosphate formed by precipitation from aqueous solutions in a host rock rich in copper and alumi
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The mineral turquoise is a hydrated copper-aluminium phosphate formed by precipitation from aqueous solutions in a host rock rich in copper and alumi
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The mineral turquoise is a hydrated copper-aluminium phosphate formed by precipitation from aqueous solutions in a host rock rich in copper and alumi
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Turquoise mineral Person holding a lump of unworked turquoise This blue-green mineral is a form of hydrated copper aluminium phosphate It has been
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Turquoise mineral Single lump of unworked turquoise This blue-green mineral is a form of hydrated copper aluminium phosphate It has been used in je
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Variscite specimen This rare bluish-green mineral is a form of hydrated aluminium phosphate and is deposited in aluminium-rich rocks
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Wardite specimen This mineral consists of forms of hydrated sodium aluminium phosphate hydroxide This bright green specimen has been deposited in no
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Turquoise specimen and polished stone (right) This blue-green mineral is a form of hydrated copper aluminium phosphate It has been used in jewellery
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Turquoise Raw and cut and polished specimens of turquoise (hydrated copper aluminium phosphate) This mineral is one of the most valuable non-transpa
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Polished turquoise cabochon The mineral turquoise is a hydrated copper-aluminium phosphate formed by precipitation from aqueous solutions in a host
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