Defn: A rare element of the carbon-silicon group, intermediate between the metals and nonmetals, obtained from the mineral zircon as a dark sooty powder, or as a gray metallic crystalline substance.
Zircon is very commonly present as scattering crystals of varying size in most igneous rocks.
Zircon is also the source of oxide of zirconium used in making mantles for certain incandescent lights.
The zircon is a very beautiful stone, varying in colour, like the topaz, from red and yellow to green and blue.
Sainte-Claire Deville formed the zircon artificially by passing silicon fluoride at a red heat over the oxide zirconia in a porcelain tube.
Octahedral crystals of zircon are then produced, which have the same crystalline form, appearance and optical qualities as the natural zircon.
For an insane instant he thought it must have a perfectly silent motor, then he realized Zircon had not yet turned on the ignition switch.
The recently developed deposits of Pablo Beach, Florida, may produce important amounts of titanium minerals along with the output of zircon and monazite.
The Indian and Brazilian monazite is obtained principally from the sands of ocean beaches, in the same localities from which zircon is recovered (p.
Opal, which is a comparatively light mineral, has a low refractive power; zircon or jargoon is a heavy mineral, and has a high refractive power.
A rare element of the carbon-silicon group, intermediate between the metals and nonmetals, obtained from the mineral zirconas a dark sooty powder, or as a gray metallic crystalline substance.
However, in most cases in the trade there is almost no chance of the unexpected presence of a zircon and the luster test is usually sufficient to distinguish the diamond.
A zircon will also similarly separate light and its rear facets also appear double-lined as seen with a lens from the table of the stone.
The decolorized zircon (jargoon) has a dispersion well up toward that of diamond and gives fairly vivid spectra on a card, but they are double, as zircon is doubly refracting.
All other colors in zircon should be named simply zircon, with a color adjective to indicate the particular color as, "brown zircon," etc.
Zircon comes nearest to having adamantine luster of any of the other gems.
Moreover, the luster of zircon is nearly adamantine, so the expert does not miss the cold metallic glitter as he would with any other white stone.
Hence, it is easy to detect zircon by any of these tests if there is reason to suspect that it has been substituted for diamond.
However, the large double refraction of the zircon easily distinguishes it from diamond (use the sunlight-card method or look for the doubling of the edges of the rear facets as seen through the table).
It is only when no direct comparison is possible, and when the expert is not suspicious, that a zircon can deceive him.
The refractive index of the dense type of zirconis so high (1.
The activity of the mixture in attacking zircon appears from the following experiment: Two zircon crystals, each weighing ½ grm.
The portion insoluble in water is readily dissolved in hydrofluoric acid, and is converted into zircon potassium fluoride.
It is very probable that in this mannerzircon might be entirely dissolved under a pressure of 10 atmospheres.
If finely divided zircon is boiled for a long time with caustic lye, it is perceptibly attacked.
If the zircon is finely ground, 15 minutes are sufficient for this operation.
Finely ground zircon is quickly rendered soluble if fused with a mixture of potassium borofluoride and potassium carbonate.
Crucibles of nickel seem especially well adapted for the fusion of zircon in caustic alkalies.
Jargon or Zirconis a stone having a superficial resemblance to a diamond.
Zircon or jargon, a stone of which false diamonds are made.
The zircon has strong refractive power, and its lustre is almost adamantine, but it lacks the fire of the diamond.
When zircon is heated it sometimes changes in colour, or altogether loses it, and at the same time usually increases in density and brilliancy.
Besides," Hobart Zircon said with a smile, "I'm hungry.
And for the sake of my gray hair, stay out of trouble," Zircon pleaded.
Still Zircon moved ahead until Rick could see two additional, smaller glows that he identified as the belt lights the frogmen had been wearing.
On a treasure hunt, one hopes; one doesn't expect," Zircon stated in his booming voice.
As they tied up, Zircon said, "Tony and I will work at his midden this afternoon.
Jimmy Kelly picked up the story, "You arrived with Zircon at about the same time the St. Croix team took off from our base, and headed right into the storm.
Zircon leaned over Tony to look out the window, and Rick had to compensate in a hurry because the big scientist's weight threw the plane out of trim.
Zircon ran to pack a bag, and Tony went to get the film Rick had taken forZircon to carry to Steve.
The plan was for Zircon and Tony to make the trip in the Water Witch, with the boys flying over in the Sky Wagon.
Then he saw what Zircon had seen, a glow in the water ahead and above them.
Zircon and Briotti charged around the corner of the hotel in pajamas and slippers, followed by other guests and members of the hotel staff.
Let's hope we can spend the night undisturbed," Zircon boomed as he finished the last of his coffee.
He was trailing us," Zircon said, indicating the Moro.
Zircon put Shannon down and heaved the pirate Scotty had wounded onto the shore.
On the south side of the group was the island of Siasi where Zircon planned to top off the fuel tanks and check in with the constabulary again.
It is common to find haloes developed perfectly in this granite, and having a nucleus of zircon less than 5 x 10-4 cms.
The question arises whether the darkened area surrounding the zircon may not be due to the influence of the radioactive substances contained in the zircon.
I'll tell Zircon this when he comes, but you can be thinking it over in the meantime.
It took him only a moment to find the camera and lift it from its case, then he handedZircon the special glasses and quickly fitted his infrared telescopic sight onto his own rifle.
Zircon took the skin and ran his finger tips over the lining.
Zircon usually contains a fair amount of uranium and very little lead.
Zircon Another very interesting mineral is zircon (a silicate of zirconium), one of the accessory minerals found in small quantities in many crystalline rocks.
Zircon usually occurs in very small grains and is heavy and hard, so that it can be separated from the other rock without much difficulty, even though it may take 100 pounds of rock to supply a gram of zircon.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "zircon" in a variety of sentences. We hope that you will now be able to make sentences using this word.
