Iron Pyrite
See Pyrite.
Irradiated Diamons
Irradiated diamonds are diamonds that have been exposed to radiation. This changes the diamond's color (as the radiation changes the crystalline structure of the diamond).
Iron Pyrite: See Pyrite.
Irradiation: The process of bombarding a gemstone with X-rays, gamma rays or streams of subatomic particles in order to change the stone's color.
Ivoride: See French Ivory.
Iron pyrites (iron sulphide) is often facetted and used as a cheap, but not very effective imitation for diamonds.
Marigold Cut
Marquis ...
Crystallized iron pyrites ("fool's gold") mounted in groups, cut or uncut, in pins and other pieces of jewelry. Marcasite is a gray, lustrous mineral.
Morganite ...
Fools Gold - Iron pyrite is often mistaken by novices for gold. Although its color resembles gold, its properties are very different from gold. It is hard and brittle while gold is soft and malleable.
The mineral marcasite, sometimes called white iron pyrite, is iron sulfide (FeS2). Marcasite is often mistakenly confused with pyrite, but marcasite is lighter and more brittle.
Marcasite is the name given to the mineral iron pyrite that is faceted for use in jewelry.
Marcasite: A mineral with the same composition as pyrite, (fool's gold), and often called "white iron pyrite", but differing in crystal structure. It can be faceted like a gemstone and is often used in sterling silver jewelry.
Iron pyrite is believed to be a very protective stone. It should be carried when performing dangerous work. It stimulates the powers of the intellect. Sunflower pyrite, a variety of pyrite, is said to be a shielding stone.
MARCASITE: A white iron pyrite. If the ore is yellow, it takes on the appearance of "fool's gold.
Marcasite - Crystallised iron pyrites ("fool's gold"), cut or uncut. Marcasite is a grey, lustrous mineral
Marquise - An oval shaped gemstone, cut to have pointed ends. It's named after the Marquise de Pompadour, Mistress of King Louis XV ...
Marcasite - A white iron pyrite, it takes on the appearance of "fool's gold." Marcasite is most often set in silver, and the term marcasite is now often loosely associated with cut steel or any white metal cut with facets.
Gold ...
Lapis generally occurs with a speckled and strained consistency, with glittering inclusions of iron pyrite.
Miners term for massive iron pyrites (fools' gold).
Brazing
Joining metals by filling clean joints with a suitable filler metal. Temperatures are higher than for soldering and a good flux is usually needed.
It is actually iron pyrite. Marcasite is generally faceted. The Czech guilloche pin above is studded with marcasites.
MARQUISE
Marquise cut stones have a shape like an oval with two pointed ends.
Marcasite
A gray, lustrous mineral (crystallized iron pyrites) that is mounted in groups, cut or uncut, on brooches and other pieces of jewelry.
The markings in turquoise, called the matrix, are created by deposits of iron pyrite (black), iron oxide (gold) and rhyolite (yellow-brown).
MARCASITE
Marcasite is a shiny, metallic semi-precious stone. It is actually iron pyrite. Marcasite is generally faceted. The Czech guilloche pin above is studded with marcasites.
...
Maracasite
A shiny, metallic semi-precious stone. It is actually iron pyrite, generally faceted.
Marquis Cut
Marquis-cut stones are shaped like an oval with two pointed ends.
Consider this: The graphite that you commonly find in pencils is also made of pure carbon, but because the carbon atoms are arranged differently, the result is a soft gray-black substance that is very unlike hard, colorless diamond. And iron pyrite ...
Pyrite: A common mineral composed of iron disulphide with a pale brass-yellow color used as an iron ore and in the production of sulfur dioxide for sulfuric acid. Also called Fool's gold and Iron pyrite.
lazulum lapis lazuli, from Arabic lAzaward -- more at AZURE
a semiprecious stone that is usually rich azure blue and is essentially a complex silicate often with
spangles of iron pyrites -- called also lapis ...
jewellers, discovering their worth, delivered them to the lapidaries to be worked up, but owing to their softness the workmen could not at first polish them, until they found out the method of doing so with mark-i-shísá, marcasite or iron pyrites.
Iron pyrite ...see pyrite
Iolite...(see cordierite)...dichroite
Ison glass...see mica
Jadeite
Crystallography: monoclinic
Colors: green, white, brown, mauve, black orange red, yellow
Luster: waxy
Hardness: 6.5 - 7 ...
 See also: Pyrite, Iron, Stone, Jewel, Color
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