Feldspar
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Feldspar

Feldspar is the name given to a group of minerals distinguished by the presence of Alumina and silica (SiO2) in their chemistry.  This group includes aluminum silicates of soda, potassium, or lime. It is the single most abundant mineral group on Earth.  They account for an estimated 60% of exposed rocks, as well as soils, clays, and other unconsolidated sediments, and are principal components in rock classification schemes. The minerals included in this group are the Albite, Anorthite, Orthoclase, Microcline and Plagioclase Feldspars.

Iran Feldspar, Feldspar

Iran has many active mines of Feldspar and has a great potentiality for exporting. It is MGT Mineral Company's honor to provide necessary conditions for exporting Feldspar. MGT Mineral Company has professional trading relationship with major Feldspar Suppliers in Iran.

 

What is Feldspar?

Albite is a Plagioclase Feldspar mineral. It is the sodium endmember of the plagioclase solid solution series. As such it represents a Plagioclase with less than 10% Anorthite content.

Physical Properties of Albite
Chemical Formula NaAlSi3O8
Cleavage {001} Perfect, {010} Good
System Triclinic
Color White, Gray, Greenish gray, Bluish green, Gray
Density 2.62 g/cm3
Diaphaneity (Transparency) Transparent to translucent to subtranslucent
Fracture Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern
Tenacity Brittle
Habit Blocky - Crystal shape tends to be equant (e.g. Feldspars); Granular - Generally occurs as anhedral to subhedral crystals in matrix; Striated - Parallel lines on crystal surface or cleavage face.
Hardness (Mohs) 7 - Quartz
Luminescence Fluorescent, Short UV=herry-red blue, Long UV=white
Luster Vitreous (Glassy)
Streak White
Magnetism Nonmagnetic

Anorthite is the calcium endmember of Plagioclase Feldspar. Plagioclase is an abundant mineral in the Earth's crust.

Physical Properties of Anorthite
Chemical Formula CaAl2Si3O8
Cleavage {001} Perfect, {010} Good
System Triclinic
Color Colorless, Gray, White, Red, Reddish gray
Density g/cm3
Diaphaneity (Transparency) Transparent to Subtransparent to translucent
Fracture Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern
Tenacity Brittle
Habit Euhedral Crystals - Occurs as well-formed crystals showing good external form; Granular - Generally occurs as anhedral to subhedral crystals in matrix; Striated - Parallel lines on crystal surface or cleavage face.
Hardness (Mohs) 6 - Orthoclase
Luminescence Non-fluorescent
Luster Vitreous (Glassy)
Streak White
Magnetism Nonmagnetic

Orthoclase is an important tectosilicate mineral which forms igneous rock. Orthoclase is a common constituent of most Granites and other felsic igneous rocks and often forms huge crystals and masses in Pegmatite.

Physical Properties of Orthoclase
Chemical Formula KAlSi3O8
Cleavage {001} Perfect, {010} Good
System Monoclinic
Color Colorless, Greenish, Grayish yellow, White, Pink
Density g/cm3
Diaphaneity (Transparency) Transparent to translucent
Fracture Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern
Tenacity Brittle
Habit Blocky - Crystal shape tends to be equant (e.g. Feldspars); Massive - Granular - Common texture observed in granite and other igneous rock; Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Hardness (Mohs) 6 - Orthoclase
Luminescence Non-fluorescent
Luster Vitreous (Glassy)
Streak White
Magnetism Nonmagnetic

 

Feldspar exporter, Iran Feldspar exporter

 

Feldspar Occurrence

Feldspars are some of the most abundant minerals in the Earth’s crust and occur in many rock types. Feldspar minerals are aluminosilicates containing varying amounts of sodium, potassium and calcium. Feldspars are divided into two groups, alkali feldspars and plagioclases, each of which is a continuous solid solution series between end-member compositions.

Deposit Types: The commercial potential of source rocks is enhanced by a high proportion of Feldspar and a low proportion of easily separated ferromagnesian minerals. Feldspar was first produced from granite pegmatites, mainly because the constituent minerals quartz, Feldspar and Mica are segregated in zones. Also, the Feldspar in these deposits is generally coarse to very coarse-grained, making selective extraction and hand- sorting relatively easy. The main disadvantage of these deposits is their typically small size. In addition, pegmatite bodies almost invariably have steep dips and are vertically extensive but rarely more than a few tens of meters wide, making large-scale extraction difficult and costly.

Feldspar producer, Iran Feldspar producer

Feldspar Usages:

  • Glass: Feldspar is an important ingredient in the manufacture of glass and an important raw material as well, because it acts as a fluxing agent, reducing the melting temperature of quartz and helping to control the viscosity of glass. The alkali content in Feldspar acts as flux, lowering the glass batch melting temperature and thus reducing production costs. But feldspars are primarily added to glass batches for their Alumina content, which improve hardness, durability, and resistance to chemical corrosion. The raw material for glass consists of silica sand, soda ash (sodium carbonate) and limestone (Calcium carbonate).

  • Ceramics: Ceramics: In the manufacture of ceramics, Feldspar is the second most important ingredient after clay. Since Feldspar does not have a strict melting point it melts gradually over a range of temperatures. This greatly facilitates the melting of quartz and clays and, through appropriate mixing, allows to modulate this important step of ceramic making. Feldspars are used as fluxing agents, to form a glassy phase at low temperatures, and as a source of alkalies and Alumina in glazes. They improve the strength, toughness, and durability of the ceramic body and Cement the crystalline phase of other ingredients, softening, melting and wetting other batch constituents. 

  • Fillers: Feldspars also are used as fillers and extenders in applications such as paints, plastics and rubber.  Beneficial properties of Feldspars include good dispersability, high chemical inertness, stable pH, high resistance to abrasion, low viscosity at high filler loading, interesting refractive index and resistance to frosting.  The products used in such applications are generally fine-milled grades.

  • Enamel frits and glazes: Feldspar assists the enamel composition, assuring the absence of defects and the neatness of the end product: e.g. enamel frits, ceramic glazes, ceramic tile glazes, sanitaryware, tableware, electrical porcelain and giftware.

  • And many other end-uses: paint, mild abrasives, urethane, welding electrodes (production of steel), latex foam, the welding of rod Coating, and road aggregate.

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