CHALCEDONY Whole Geode + HELECTITES Fluorescent 2Colors

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CHALCEDONY GEODE This specimen measures 2 1/2" x 2 1/4" x 2", and weighs 4oz. It is a whole CHALCEDONY GEODE with layers of crystal growth forming a 'flower' or 'bird's nest' shape. The sides are mixed creamy and white on both the inside and outside. Inside, on the bottom, are clear sparkling crystals and t are also small white stalactites and helectites (helectites grow horizontally). Under UV light - Ultraviolet Light - it is very colorful: solid bright green under SW UV light, and purple with green on the edge/lip under LW UV light. From Ojinaga, Chihuahua, Mexico. CHALCEDONY (A variety of Quartz, often with Iron and Aluminum) Chemical Composition: SiO2 Silicon Dioxide Hardness : 7 Crystal Habit: Massive. Crusts of botryoidal or mammillary form, banded, compact. Color: Very variable: White, grey, red, yellow, brown, green, black. Variegated or mottled, often with colored bands and folds. Lustre: Transparent to translucent. Streak: White Fracture : Splintery or Conchoidal. Misc: Sometimes fluorescent. Pseudomorph of Chalcedony after coral and/or shells are found in Florida , USA . Petrified trees replaced with Chalcedony are found in Arizona , USA . Carnelian and Sard are clear red to brownish red. Sardonyx and Onyx are sard and carnelian in layers. Heliotrope and Bloodstone are bright green with spots of red. Agate is read more

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