carnelian a variety of chalcedony

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Description

Carnelian (also sometimes referred to as cornelian) a variety of chalcedony

Mineral Group  oxide
Composition  SiO2
dimension (cm)  6x5x4
weight (g)  113
It is found primarily in India, as well as various sites in South America and is a variety of chalcedony. The most favorable pieces are a deep red to red-orange hue. Carnelian has a long and storied past, and was once considered strictly the property of the noble class. People holding a high social status were often buried with this gem stone.
also from Wikipedia
 It is a brownish-red mineral commonly used as a semi-precious gemstone. Similar to carnelian is sard, which is generally harder and darker (the difference is not rigidly defined, and the two names are often used interchangeably). Both carnelian and sard are varieties of the silica mineral chalcedony colored by impurities of iron oxide. The color can vary greatly, ranging from pale orange to an intense almost-black coloration. It is most common in Brazil, India, Siberia and Germany.
more at minerals.net

Additional information

Weight 113 g
Dimensions 6 x 5 x 4 cm