Calcite

According to Ritter, even two crystalline substances of different hardness, such as Calcite and quartz, become electric when rubbed together, the softer playing the part of 'resin' and the harder that of 'glass'.

Man or Matter Ernst Lehrs

Calcite splits incoming rays of light in two, known as birefringence.

Sunstones could have helped Vikings navigate from Norway to America 2011

Arg. Now, having just discovered that Jean Auel did, indeed, complete a Clan of the Cave Bear sequel long after I lost interest in the whole series, I'm reading said sequel, titled Cliffs of Stone or Caverns of Calcite, or Sex Scenes of Doom, or More People Who Live in Caves and Love Ayla, or whatever.

Readin' Update 2007

Arg. Now, having just discovered that Jean Auel did, indeed, complete a Clan of the Cave Bear sequel long after I lost interest in the whole series, I'm reading said sequel, titled Cliffs of Stone or Caverns of Calcite, or Sex Scenes of Doom, or More People Who Live in Caves and Love Ayla, or whatever.

SeeLight: 2007

Calcite: Easy - caves, fossilization and invertebrates.

Archive 2008-09-01 ReBecca Foster 2008

Calcite-laden waters have created this unique landscape comprising mineral forests, petrified waterfalls and a series of terraced basins.

Hierapolis-Pamukkale, Turkey 2008

Calcite deposits tightly seal this system below weathering penetration.

Jobos Bay National Estuarine Research Reserve, Puerto Rico 2008

Calcite: Easy - caves, fossilization and invertebrates.

5 Minerals ReBecca Foster 2008

Calcite is very hard to find undamaged, since it's essentially salt.

In Pictures: Highlights Of Marc Weill's Mineral Collection Missy Sullivan 2006

Calcite (calcium carbonate, CaCO3) is the primary component of naturally formed patina on buried archaeological artifacts in calcareous areas, such as the Jerusalem region.

Gold Dust and James Bond 2003