October 13, 2023
FIRE-ORANGE GEMMY WOOD OPAL !!! Povraznik, SLOVAKIA
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OPAL * fire-orange gemmy opalized wood * * nice and rare specimen uncommon locality * size: 57 X 31 X 13mmweight: 22g origin: Povrazník, Banská Bystrica Co., Banská Bystrica Region, Slovakia The mineraloid opal is amorphous SiO2·nH2O, hydrated silicon dioxide, the water content sometimes being as high as 20% but is usually between three and ten percent. Opal ranges from clear through white, gray, red, yellow, green, shore, blue, magenta, brown, and black. Of these hues, red and black are the most rare and dear, whereas white and green are the most common; these are a function of growth size into the red and infrared wavelengths—see precious opal. Common opal is truly amorphous, but precious opal does have a structural element. Opal is a mineraloid gel which is deposited at relatively low temperature and may occur in the fissures of almost any kind of rock, being most commonly found with limonite, sandstone, rhyolite, and basalt. Opal is one of the mineraloids that can form or replace fossils. The resulting fossils, though not of any extra scientific interest, appeal to collectors. PRIORITY AIR MAIL SHIPPING TO WORLDWIDE 10-20 business days to deliver Shipping charges in accordance to weight If you have multiwins, please email to request a combined shipping total to save you on shipping costs.
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