Periclase


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periclase

[′per·ə‚klās]
(mineralogy)
MgO Native magnesia; a mineral occurring in granular forms or isometric crystals, with hardness of 6 on Mohs scale, and specific gravity of 3.67-3.90. Also known as periclasite.

Periclase

 

a mineral that consists of natural magnesium oxide (MgO) with occasional admixtures of FeO, MnO, and ZnO. Periclase, whose crystal structure resembles that of rock salt, crystallizes in the isometric system to form cubic and octahedral crystals as well as irregular grains; cleavage is perfect along the cube. Periclase is grayish white, yellow, dark green, or black with a hardness of 5.5–6 on Mohs’ scale and a density that ranges from 3,600 to 3,900 kg/m3. It is characteristic of meta-morphic limestones and dolomites. As a result of weathering, periclase alters to brucite and hydromagnesite. Artificial periclase, which is usually prepared by sintering natural magnesite at 1600”-1650oC or by electrically smelting natural magnesite, is important in manufacturing magnesite refractories.

periclase

A crystalline mineral which is sometimes found in portland cement, portland cement clinker, and certain slags.
References in periodicals archive ?
Country: Norway, , IrelandSector: Construction/Real EstateTarget: Premier Periclase Ltd Ireland , SMA Mineral Magnesia ASBuyer: RHI AG Deal size in USD: 28mType: Corporate acquisitionStatus: ClosedComment: Deal size is for Premier Periclase only.
Chemical composition of platinum-rhodium alloy after oxidation induction melting in periclase crucible and subsequent EBM Product name Weight share of elements, % Pt Rh Pd Ir Initial scrap 92.
Later, periclase may rehydrate to form brucite during the retrograde phase by the hydration reaction (2):
Sheila Martin, who heads one of the biggest residents groups in the area said Premier Periclase had been "economical with the truth" regarding emissions in the past.
Other compounds present were forsterite and periclase.
In both cases, Mg was found to be mostly present as periclase (MgO) and also partially bound as undecomposed carbonates (dolomite--CaMg[(C[O.
Premier Periclase, which produces magnesia from sea water, reported another good year with results similar to 1989.
7]], periclase [MgO], clinker-minerals: belite [[beta]-C2S], merwinite [Ca3Mg(SiO4)2].
Mg was found in both cases mainly as periclase (MgO), partially bound to carbonates (dolomite) or silicates (merwinite).
Thus, in the samples thermooxidated up to 600-650[degrees]C dolomite and periclase MgO, calcite and lime CaO were simultaneously detrmined (Fig.