06-11

06-11. Calcite #1.

Calcite is the mineral of week #24.

Transparent to opaque and on some occasion phosphorescent or fluorescent, a variety of Calcite called Iceland spar has been used in experiments for a cloak of invisibility, a tradition that goes back to the Nibelungenlied apparently.

Calcite is often the primary constituent of the shells of marine organisms, the hard parts of red algae, some sponges, and oysters. Without calcite and aragonite, many of Earth’s organisms could not exist. Calcite crystals are part of the trigonal-rhombohedral system. Components of crystals in the trigonal system are located by reference to four axes—three of equal length with 120° intersections and one perpendicular to the plane of the other three.

Calcite crystals are part of the trigonal-rhombohedral system. Components of crystals in the trigonal system are located by reference to four axes—three of equal length with 120° intersections and one perpendicular to the plane of the other three.

Calcite was used in ancient Egypt to make artifacts and adorns the tombs of several Pharaohs. Today, large deposits can be found in the Snowy River Cave of New Mexico, one of the longest cave formation in the world.

06-11

Advertisements

Thanks for the input

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s