Lemon Quartz Rutilated

Lemon Quartz Rutilated

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Lemon Quartz Rutilated

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Lemon quartz obtains its brilliant sparkling color through an artificial gamma-ray irradiation process followed by a mild heat treatment. Not all quartz can be made into sparkling lemon quartz. Most aluminum-rich quartz will turn near-black to black when irradiated, though some yellowish-brown aluminum-rich quartz can be used to produce lemon quartz if it is first heated and then irradiated. Heat causes the material to lose its color and when it is exposed to irradiation, the yellow color returns. Also, lithium-rich quartz that is exposed to very mild heat (140-280 °C) tends to turn yellowish-green even without irradiation. These could be traded as both citrine or lemon quartz, since they are not irradiated.

Rutilated quartz is a variety of quartz which contains acicular (needle-like) inclusions of rutile. It is used for gemstones. These inclusions mostly look golden, but they also can look silver, copper red or deep black. They can be ditstributed randomly or in bundles, which sometimes are arranged star-like, and they can be sparse od dense enough to make the quartz body nearly opaque. While otherwise inclusions often reduce the value of a crystal, rutilated quartz in fact is valued for the quality and beauty of these inclusions.

Quartz is a mineral composed of silicon and oxygen atoms in a continuous framework of SiO4 silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO2. Quartz is the second most abundant mineral in Earth’s continental crust, behind feldspar.

Quartz crystals are chiral, and exist in two forms, the normal α-quartz and the high-temperature β-quartz. The transformation from α-quartz to beta-quartz takes place abruptly at 573 °C (846 K). Since the transformation is accompanied by a significant change in volume, it can easily induce fracturing of ceramics or rocks passing through this temperature limit.

Lemon Quartz Rutilated

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