Yang H, Hazen R M, Finger L W, Prewitt C T, Downs R T (1997) Compressibility and crystal structure of sillimanite, Al2SiO5, at high pressure Physics and Chemistry of Minerals 25 39-47: 1997: 5.29: 293: 0018074: Sillimanite: Taylor W (1928) The structure of sillimanite and mullite. _cod_database_code 1011204 Zeitschrift fur Kristallographie 68 ...

Sillimanite is the best raw material for the manufacture of high alumina refractories or 55-60% alumina bricks. But its use on large scale is not possible due to its fine grading and high cost. [citation needed] Dumortierite and mullite are similar mineral species found in porcelain.

Request PDF | Utilisation of Sillimanite beach sand minerals for the development of new generation refractories | Sillimanite sand, a by-product generated during the extraction of rare earth ...

General Sillimanite Information : Chemical Formula: Al2SiO5 = Al[6]Al[4]OSiO4 : Composition: Molecular Weight = 162.05 gm Aluminum 33.30 % Al 62.92 % Al 2 O 3: Silicon 17.33 % Si 37.08 % SiO 2: Oxygen 49.37 % O: 100.00 % 100.00 % = TOTAL OXIDE

Sillimanite, a white to tan to green aluminum silicate, (Al 2 SiO 5) occurs in high temperature, aluminum-rich metamorphic rocks.In Delaware, it is found in the Hoopes Reservoir and Brandywine Springs areas. In 1977, the Delaware General Assembly, acting on a proposal by the Delaware Mineralogical Society, established sillimanite as the Delaware State Mineral.

The sillimanite minerals show hardness and density in the ranges 5.5-7.5 and 3.13-3.65, respectively, with andalusite having the lowest and kyanite the highest density. Chiastolite is a variety of ...

Sillimanite is the mineral which forms at high temperatures and low to high pressure. Luster is vitreous to subadamantine, or silky. Its hardness is 7.0, with a white or colorless streak and a density of 3.2-3.3. Its fracture pattern is splintery, similar to kyanite. Cleavage is perfect.

The major end use of sillimanite minerals is in the iron and steel industries which consume 60% or more of the mullite refractories (Dickson 1996). They are used in critical areas of furnaces, steel degassing chambers, soaking pits and many types of auxiliary pouring and handling equipment. The sec-

Uses of Sillimanite: Sillimanite minerals are mainly utilized in the production of mullite or high-alumina refractories. About 95% of the world's consumption of these minerals is made for this purpose. The extracted aluminum is used as metals and alloys. Sillimanite is used to manufacture glass, ceramics, and cement.

Delaware State Mineral - Sillimanite. In 1977, the Delaware General Assembly, acting on a proposal by the Delaware Mineralogical Society, established sillimanite as the Delaware State Mineral. This act recognizes the geological and mineralogical significance of the large masses of this mineral found as boulders at Brandywine Springs, an ...

Sillimanite Mineral. Sillimanite, named after the American chemist Benjamin Silliman, is an aluminosilicate mineral with the chemical formula Al 2 SiO 5 The term Sillimanite was first described in 1824 for an occurrence in Chester, US. A common form of Sillimanite is known as fibrolite. It is named fibrolite because the minerals occur like a ...

There are several uses of sillimanite powder in various mining industries as in form of raw material in powder form .They are as Follows:-. *) Sillimanite Powder used as Refractory Products: -Between 1545º to 1550ºC, as it changes over to mullite there is a fairly rapid permanent expansion of 2-3%. The mineral thus shows negligible expansion ...

Sillimanite both in the form of rock and granular forming minerals differing somewhat in crystallographic form has been considered as the excellent raw material characteristics and thereby in physical properties. only for refractory lining applications worldwide. More The industrial use of sillimanite minerals is …

Description. IMAR 7 th Edition. Kyanite, andalusite, and sillimanite are naturally occurring anhydrous aluminum silicate minerals. Each has the same chemical formula, Al 2 SiO 5, but differing crystal structures, making them mineral polymorphs.These variances in crystal structure give somewhat unique physical properties to each of the three minerals, and each is used in slightly different ways ...