Electrical properties
- Arthur Chadbourne
- May 17, 2021
- 1 min read
Article 12
May 12,2020
Gemstones in general may have one of three electrical properties: one is conduction, another is piezoelectric, while the third is pyroelectric. First of all, most gem minerals lack metallic bonding, so thus, are insulators. Electroconductivity occurs when gold, silver, or copper are bonded in the crystal. Graphite is also a conductor, making it a key impurity. The Piezoelectric property is found in both tourmalines and quartz making the cross-section of certain crystals capable of receiving radio signals. This is due to the presence of a polar axis inside the crystal. Electricity is formed at the opposite ends by some pressure (and vice-versa). Lastly, the pyroelectric property is related to the gems ability to develop an electric charge upon heating or cooling. This makes the tourmaline crystal attract dust particles when heated.
This 0.5 carat Australian sapphire clings to the lid of its gem jar due to static electricity.
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