SILLIMENITE[GEM]

Listing Description:
Sillimanite is an alumino-silicate mineral with the chemical formula Al2SiO5. Sillimanite is named after the American chemist Benjamin Silliman (1779-1864). It was first described in 1824 for an occurrence in Chester, Middlesex County, Connecticut, USA.
Detailed Description:
Sillimanite is one of three alumino-silicate polymorphs, the other two being andalusite and kyanite. A common variety of sillimanite is known as fibrolite, so named because the mineral appears like a bunch of fibres twisted together when viewed in thin section or even by the naked eye. Both the fibrous and traditional forms of sillimanite are common in metamorphosed sedimentary rocks. It is an index mineral indicating high temperature but variable pressure. Example rocks include gneiss and granulite. It occurs with andalusite, kyanite, potassium feldspar, almandine, cordierite, biotite and quartz in schist, gneiss, hornfels and also rarely in pegmatites.
Sillimanite has been found in Brandywine Springs, New Castle County, Delaware, USA. It was named by the State Legislature in 1977 as the state mineral of Delaware by suggestion of the Delaware Mineralogical Society, Inc.
Natural sillimanite rocks cut into the required shape and size are used mainly in glass industries. 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. Dumortierite and mullite are similar mineral species used in quality porcelain.


PRICE
$858395.64/KG OR $390179.83/IB

For more information:

mobile: +2348039721941

contact person: emeaba uche

e-mail: emeabau@yahoo.com

website: www.franchiseminerals.com

Comments

Post a Comment

Popular posts from this blog

AGATE[GEM]

Image
Listing description Agate (pronounced /ˈæ ɡə t/ ) is a microcrystalline variety of quartz ( silica ), chiefly chalcedony , characterised by its fineness of grain and brightness of color. Although agates may be found in various kinds of rock, they are classically associated with volcanic rocks but can be common in certain metamorphic rocks . [1] Detailed description Etymology and history The stone was given its name by Theophrastus , a Greek philosopher and naturalist, who discovered the stone along the shore line of the river Achates ( Greek : Ἀχάτης ) sometime between the 4th and 3rd centuries BC. [2] Colorful agates and other chalcedonies were obtained over 3,000 years ago from the Achates River, now called Dirillo , in Sicily . [3] Ancient use Agate is one of the most common materials used in the art of hardstone carving , and has been recovered at a number of ancient sites, indicating its widespread use in the ancient world; for example, archaeological recovery a...
Read more

ALEXANDRITE

Image
The alexandrite variety displays a color change ( alexandrite effect ) dependent upon the nature of ambient lighting. This color shift is independent of any change of hue with viewing direction through the crystal that would arise from pleochroism . Both these different properties are frequently referred to as "color change", however. DETAILED DESCRIPTION The alexandrite variety displays a color change ( alexandrite effect ) dependent upon the nature of ambient lighting. This color shift is independent of any change of hue with viewing direction through the crystal that would arise from pleochroism . Both these different properties are frequently referred to as "color change", however. Alexandrite results from small scale replacement of aluminium by chromium ions in the crystal structure, which causes intense absorption of light over a narrow range of wavelengths in the yellow region of the spectrum. Alexandrite from the Ural Mountains in Russia is gree...
Read more

TOURMALINE(RUBELITA)GEM

Image
Listing description : MINERALOGY:  The  pink tourmaline , also known as rubelita originates primarily in plutonitas acids, specifically  pegmatite , where forms large  crystals . Through the action of gases containing  boron, from the magma of the host rock, tourmaline it can also arise as inclusion neumatolítica  ( generated depth of the crust (Plutonism) by intrusion of magma, which causes alteration in petrographic composition of the invaded rocks ) then the crystals are included heavily on rock, the  pink tourmaline  consists of different mineral elements, but always has the same structure, the metals are always included in tourmalines and are causing varieties this mineral colors,  the pink tourmaline carries traces of manganese  that is what gives her cute pink. Detailed Description: MYTHOLOGY:  It was found in the Minas Gerais (Brazil)  crystal pink tourmaline (rubellite) of 109 cm.  pink tour...
Read more