Where is Eucryptite found?

Where is Eucryptite found?

Eucryptite is a “hexagonal lithium aluminium silicate, commonly found as an alteration product of spodumene”. This specimen is from a classic pegmatite mine in central Arizona called the Midnight Owl.

What is the chemical composition of fluorite?

Fluorite Composition: Calcium fluoride, CaF2. Ca = 51.1 percent, F = 48.9 percent. Diagnostic Features. Determined usually by its cubic crystals and octahedral cleavage; also vitreous luster and usually fine coloring, and by the fact that it can be scratched with a knife.

What is the chemical formula of Willemite?

Formula (repeating unit) Zn 2SiO 4
IMA symbol Wlm
Strunz classification 9.AA.05 (10 ed) 8/A.01-20 (8 ed)
Dana classification

What is beta spodumene?

Spodumene has three polymorphic forms. The form occurring in nature is monoclinic low-temperature α-spodumene (C2/c). The tetragonal high-temperature form is called β-spodumene (or LiAlSi2O6 II) (P43212) which is stuffed derivative of the keatite structure (Li and Peacor, 1968).

What’s fluorite used for?

The primary uses of fluorite are flux in steel manufacture, opalescent glass, enamels for cooking utensils, hydrofluoric acid, high-performance telescopes, camera lens, and as index mineral of Mohs hardness scale of “Four.”

Is fluorite toxic to humans?

Fluorine is a relatively soluble and highly reactive found within fluorite. Exposure to the chemical can lead to a severe bone disease called skeletal fluorosis, which weakens bones. In China, coal mining has caused more than 20 million people to suffer from fluorosis.

Is willemite a zeolite?

Willemite is a zinc silicate mineral ( Zn 2SiO 4) and a minor ore of zinc. It is highly fluorescent (green) under shortwave ultraviolet light. It occurs in a variety of colors in daylight, in fibrous masses, solid brown masses (troostite), and apple-green gemmy masses.

How is willemite formed?

Willemite can form during exsolution, intimately mixed with other minerals; at Franklin these include pale green petedunnite, blue vesuvianite (var. cyprine), gray tephroite, or pink bustamite. At Sterling Hill the tephroite is usually brown, and can include striking patterns of willemite exsolution lamellae.

Is fluorite safe to touch?

Fluorite (CaF2) is a mineral that is listed as being dangerous because it contains the element fluorine, which by itself can be some nasty stuff. However, when fluorine is bonded with calcium, it has entirely different properties than fluorine by itself.

What is willemite used for?

Uses. Artificial willemite was used as the basis of first-generation fluorescent tube phosphors. Doped with manganese-II, it fluoresces with a broad white emission band. Some versions had some of the zinc replaced with beryllium.

Where is willemite found?

Sources. The foremost occurrences of willemite are in Franklin and Sterling Hill, New Jersey. These sites produce stubby green crystals and greenish orange masses to several inches in length, as well as massive troostite material and crystals up to 6 inches long.

What is beta eucryptite made of?

Beta eucryptite (LiAlSiO//4) is a stuffed derivative of the quartz structure. In terms of the quartz structure, half the Si**4** plus ions are replaced by Al**3** plus ions. The charge is balanced by the incorporation of Li** plus into the main channels of the structure, which parallel the c axis.

What are the crystals of beta-eucryptite?

Crystals of beta-eucryptite (LiAlSiO 4, space group P 6 4 22, a = 10.49, c = 11.200 Å) have been studied as a function of temperature, using a single-crystal diffractometer. Reflections with h or

What is the thermal expansion of beta-eucryptite?

The thermal expansion of the axes and the cell volume are explained in terms of a temperature-dependent dynamic disorder process of the Li atoms. An appendix is included in which the calculation of thermal expansion of beta -eucryptite is presented.

What is the coefficient of thermal expansion of B-eucryptite sintered at 1100 °C?

The coefficient of thermal expansion of b-eucryptite ceramics sintered at 1100 °C is calculated to be -4.93×10-6 °C-1. Crystallization behaviors of the ceramics may play an important role in the increase of negative thermal expansion of b-eucryptite.