fluorite

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fluorite

a fluorine-bearing rock mineral. Called also fluorspar, calcium fluoride.
References in periodicals archive ?
Discovered by the Romans more than 2,000 years ago Blue John has been mined and crafted into precious objects since the 18th century, when it became highly fashionable and was used to create everything from urns to jewellery.
Believed to have been discovered by the Romans more than 2,000 years ago, Derbyshire Blue John became highly fashionable in the 1700s when it was used to create everything from urns to bowls and jewellery.
Georgiana Cavendish, Duchess of Devonshire (1757-1806) used to collect Blue John, among other minerals, and in 1842, her husband, William, the 5th Duke and owner of Chatsworth, commissioned the Chatsworth Tazza, which is one of the largest objects ever made from Blue John.
Canyonlands and Arches national parks Chief Ranger Denny Ziemann said they started searching for Richards after they came across his abandoned campsite, and they discovered his car two days later at the Little Blue John Canyon's trailhead.
Film -- 127 Hours on OSN Box Office 1 This is the true story of Aron Ralston, a thrill-seeking adventurist who, on a spontaneous hike to Blue John Canyon in Utah became trapped in a canyon after a boulder became dislodged and crushed his arm against the wall.
Donald, a season ticket holder for more than 50 years, was treated to full hospitality including a tour of the Ricoh Arena and pre-match meal before joining the captains Sammy Clingan and former Sky Blue John Eustace on the pitch for photographs before the Watford game.
TRUE BLUE John Terry is after the top job at the Bridge
6 127 Hours (15) Mountain climber Aron Ralston (James Franco) made headlines when he became trapped in the Blue John Canyon in Utah, his arm pinned against the wall by a heavy boulder.
Climbing through Blue John Canyon he dislodged a huge boulder which fell on top of him, trapping his right hand between it and the wall.
One such person is Aron Ralston (James Franco), an avid mountain climber who made headlines in 2003 when his arm became trapped under a boulder in the Blue John Canyon, in Utah, and he eventually elected to amputate it with a pen knife to escape.
One such person is Aron Ralston, an avid mountain climber who made headlines in the summer of 2003 when he became trapped in the Blue John Canyon in Utah, his arm pinned against the wall of the canyon by a heavy boulder.
Film: Facing a crisis of conscience in canyon An amazing tale of endurance Avid mountain climber Aron Ralston (James Franco, pictured) made headlines in 2003 when he became trapped in the Blue John Canyon in Utah, his arm pinned by a heavy boulder.