MGK Mines

Potassium Feldspar

Potassium Feldspar (KAlSi3O8) is a Potassium Aluminum Silicate group of mineral occurring in pink, white, grey or brown in colour with a hardness of 6-6.5 on Mohs scale of hardness. The rich alumina and silica content makes feldspar an essential constituent in several industrial applications, such as glass, ceramics, fillers, enamel frits, glazes, and flooring.

Specification of MGK FELDSPAR

CHEMICAL	GRADE I in % (w/w)	GRADE II in % (w/w)
Silica as SiO2	65.92	66.50
Alumina as Al2O3	18.77	18.60
Potassium as K2O	13.50	11.89
Sodium as Na2O	2.24	2.33
Iron as Fe2O3	0.19	0.37
Titanium as TiO2	0.07	0.04
Loss on Ignition	0.22	0.18

Quartz

Quartz is a mineral composed of silicon and oxygen, with a chemical composition of SiO2. It is the most abundant mineral in Earth's crust and is resistant to both chemical and physical weathering.

It has a hardness of seven on the Mohs Scale which makes it very durable. It is chemically inert in contact with most substances. It has electrical properties and heat resistance that make it valuable in electronic products. Its luster, color, and diaphaneity make it useful as a gemstone and also in the making of glass. Quartz sand is used in the production of container glass, flat plate glass, specialty glass, and fiberglass. The high hardness of quartz, seven on the Mohs Scale, makes it harder than most other natural substances. As such it is an excellent abrasive material. Quartz sands and finely ground silica sand are used for sand blasting, scouring cleansers, grinding media, and grit for sanding and sawing.

Quartz is very resistant to both chemicals and heat. It is therefore often used as a foundry sand. With a melting temperature higher than most metals, it can be used for the moulds and cores of common foundry work. Refractory bricks are often made of quartz sand because of its high heat resistance. Quartz sand is also used as a flux in the smelting of metals.

Quartz sand is used as a filler in the manufacture of rubber, paint, and putty. Screened and washed, carefully sized quartz grains are used as filter media and roofing granules. Quartz sands are used for traction in the railroad and mining industries. These sands are also used in recreation on golf courses, volleyball courts, baseball fields, children's sand boxes and beaches.

Specification of MGK QUARTZ

CHEMICAL	GRADE I in % (w/w)	GRADE II in % (w/w)
Silica as SiO2	99.81	97.99
Alumina as Al2O3	0.025	0.22
Potassium as K2O	0.007	0.04
Sodium as Na2O	0.010	0.10
Iron as Fe2O3	0.010	0.37
Titanium as TiO2	0.006	0.05
Loss on Ignition	0.22	0.50
Electrical Conductivity (uS/cm)	4.9	4.9

Pegmatite

Pegmatite, almost any wholly crystalline igneous rock that is at least in part very coarse grained, the major constituents of which include minerals like Quartz, Potassium Feldspar, Sodium Feldspar, Mica, Tourmaline, Vermiculite, Apatite etc. Granitic and syenitic pegmatite deposits are the chief source of commercial feldspar, sheet mica, and beryllium, tantalum–niobium, and lithium minerals.

Quartz and alkali feldspars are the essential constituents; the most common varietal and accessory minerals are muscovite, biotite, apatite, garnet, and tourmaline.

Pegmatite is frequently mined for industrial minerals. Large sheets of mica are mined from pegmatite. These are used to make components for electronic devices, retardation plates, circuit boards, optical filters, detector windows, and many other products

Specification of MGK PEGMATITE

CHEMICAL	GRADE I in % (w/w)	GRADE II in % (w/w)
Silica as SiO2	69.57	67.91
Alumina as Al2O3	15.85	16.57
Potassium as K2O	12.58	11.58
Sodium as Na2O	0.010	0.10
Iron as Fe2O3	0.010	0.37
Titanium as TiO2	0.006	0.05
Loss on Ignition	0.22	0.50
Electrical Conductivity (uS/cm)	4.9	4.9

Kaolin

Kaolin is a clay mineral, with the chemical composition Al2Si2O5(OH)4. Kaolin is a soft, earthy, usually white, mineral (dioctahedral phyllosilicate clay), produced by the chemical weathering of aluminium silicate minerals like feldspar. It has a low shrink–swell capacity and a low cation-exchange capacity (1–15 meq/100 g).

Kaolin, soft white clay that is an essential ingredient in the manufacture of china and porcelain and is widely used in the making of paper, rubber, paint, and many other products.

Specification of Kaolin

CHEMICAL	% (w/w)
Silica as SiO2	55-58
Alumina as Al2O3	33-35
Potassium as K2O	1-4
Magnesium as MgO	1-2
Iron as Fe2O3	1-2.5
Calcium as CaO	0.5-1
Sodium as Na2O	1-2
Loss on Ignition	11-13
Particle Size	6-7
Whiteness	94-96

Mica

Muscovite is a hydrated phyllosilicate mineral of aluminium and potassium with formula KAl2(AlSi3O10)(F,OH)2, or (KF)2(Al2O3)3(SiO2)6(H2O). It has a highly perfect basal cleavage yielding remarkably thin laminae (sheets) which are often highly elastic.

Muscovite has a Mohs hardness of 2–2.25 and a specific gravity of 2.76–3. It can be colourless or tinted through grey, green or red, and can be transparent or translucent. It is anisotropic and has high birefringence. Its crystal system is monoclinic.

Muscovite is the most common mica, found in granites, pegmatites, gneisses, and schists. It is characteristic of peraluminous rock, in which the content of aluminium is relatively high. In pegmatites, it is often found in immense sheets that are commercially valuable. Muscovite is in demand for the manufacture of fireproofing and insulating materials and to some extent as a lubricant.

Specification of MGK MICA

CHEMICAL	% (w/w)
Silica as SiO2	54.48
Alumina as Al2O3	28.50
Potassium as K2O	06.80
Magnesium as MgO	01.72
Iron as Fe2O3	01.65
Calcium as CaO	00.53
Loss on Ignition	3.98

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