Amulet Stones /Australian Thunder Eggs ~BATCH OFFER-16A
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Lot Offer of Complete Thunder Eggs/ Amulet Stones Fully intact round specimens 33 Amulet stones Lot Weight: 206 grams ~ 7.21 ounces ~ 1030 carats Size: Largest piece measures 27 mm x 20 mm x 15 mm (1" x 3/4" x 5/8") Smallest piece measures 16 mm x 13 mm x 7 mm (5/8" x 1/2" x 1/4") Agate that forms in volcano From Australia Each Amulet has its own unique "star" formation Mysterious, Unique and Interesting Ancient man believed they dropped from the sky during thunderstorms named them Thundereggs. Until recently, it was believed they were hurled from a volcano, and cooled and hardened as they flew trough the air. Now, it is believed that eggs form as lava around gas bubbles in the lava flow. A Thunder Egg is an egg-shaped body of lava, containing a cavity with crystals. Round agate-filled nodules which form in some types of silica-rich volcanic rocks As the molten volcanic lava cooled, steam and other gases trapped in the lava formed an expanding bubble. Silica minerals often crystallise around the bubble or grow crystal fibres which radiate outwards from the its centre. These mineral-filled bubbles with a radiating structure are called spherulites. Sometimes gas pressure can forced the spherulite apart to form a central hollow which is later filled with more minerals. Later drying out, shrinkage and cracking of silica gels
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