Is iron ore a silicate mineral?
The term "iron ore" is quite general, and can be applied to a number of different minerals, like hematite, magnetite, goethite, or pyrite.
Olivine is known by many names. The term chrysolite is an old German name that was applied to gemmy olivine, but now is only sometimes used to refer to light yellowish green olivine. Evening emerald is a name given to olivine's gemstone variety, peridot, by some jewelers in some attempt to increase the apparent value of the stones.
Is one of the most mispronounced of gemstone names. The correct pronunciation has peridot rhyming with doe or depot. But peridot is often pronounced incorrectly so that it rhymes with dot.
Peridot is the birthstone of August and is usually a very affordable colored gemstone. Unfortunately it is often compared to the rich dark green of emerald and in this comparison it is found lacking. But peridot has its own unique green-yellow color that is different from emerald and this comparison is rather unfair.
Most peridot is actually the magnesium rich forsterite and its color is caused by the presence of iron ions. Fayalite's higher iron content make for darker, less attractive specimens that are not generally used as gemstones. The best colored peridot has an iron percentage less than 15% and includes nickel and chromium as trace elements that may also contribute to the best peridot color.
Peridot is a colorful, affordable and attractive gemstone. Olivine is found in ultramafic igneous rocks and marbles that formed from metamorphosed impure limestones. Mafic is a word that is used to define igneous rocks with a high iron and magnesium content.
The "MA" is for magnesium while the "F" is for ferrum, the latin word for iron. The olivine minerals have a high melting point and are the first minerals to crystallize from a mafic magma. Pyroxenes are just beginning to form.
The early crystallization of olivine is the reason that molten lavas can contain already crystallized grains of olivine. Peridotites contain the same chemical makeup as the molten magma in the Earth's mantle. Thus peridotite could be called the most common rock by volume in the Earth, although on the Earth's surface and in the crust it is not nearly as well represented.
Gabbros that started out with large amounts of olivine at one time. Serpentine preserving the outward shape of what was originally an olivine crystal.
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