Calcite is a mineral which forms most of a common rock called limestone. A pure form of calcite, called Iceland spar, is transparent. If you placed a piece of it on this page, you would see two images of every word. This unusual feature is called double refraction.
Check Also
Danavulapadu Jain Temple, Kadapa District, Andhra Pradesh, India
Danavulapadu Jain Temple is an ancient Jain center located in Danavulapadu village, within the Jammalamadugu …