Quartz and Calcite Geode (a-620)


Product type: Quartz and Calcite Geode

Tags: Geode, Quartz


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These beauties are a combination of two glorious minerals (Quartz and Calcite) in half-geode form! Quartz, the second most common mineral in the Earth’s crust, possesses a very rare property called piezoelectricity. This means that when Quartz is compressed, it produces an electrical current and conversely will begin to expand/contract (vibrate) when electricity is applied to it. This incredible phenomenon is why quartz crystals are used in wristwatches. When the watch battery sends electricity to the quartz the crystal begins to vibrate at an extremely consistent frequency of 32,798 hertz. Then a circuit in the watch counts the oscillations and uses them to time each second! Calcite is a rather common mineral that ranges in shape, texture, size, and clarity, from being almost gem-like lustrous to more rock like and dusty! 

You will receive the exact specimen in the photographs above.