A Geoscience Digital Image Library

TitleTourmaline with muscovite
DescriptionTourmaline is actually the name for a group of minerals with the similar chemical formula of AX3Y6(BO3,)3Si6O18(O,OH,F)4. Tourmalines have many unique properties such as they are piezoelectric which means that when a crystal is heated, compressed or vibrated a different electrical charge will form at opposite ends of the crystal. Conversely if an electrical potential is applied to the crystal, it will vibrate. They are also pleochroic. This sample is approximately 7 cm.
PhotographerShannon Heinle. 2001-11-28.
CollectionUniversity of North Dakota Mineralogy Collection.
Key wordstourmaline
Tech details325 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera.
GeoDIL number1856