Question: Siberian-Urals Aluminium Company comprises 19 businesses involved in the production of a chemical compound that naturally in what crystalline polymorphic phase?

Context paragraphs:
Aluminium sulfacetate: Aluminium sulfacetate is a chemical compound of aluminium with formula Al2SO4(CH3CO2)4 .  It is a double salt of aluminium sulfate and aluminium acetate.  It can be used as a mordant, which is a substance used to set dyes on fabrics that typically contains a polyvalent metal ion like aluminium or iron, In mixtures with basic aluminium diacetate or aluminium sulfacetate, aluminium triacetate has been used as a mordant with alizarin dye.  In 1899, Albert Ganswindt recommended that the use of impure sulfacetates that are empyreumatic liquids "should be abandoned" in favour of pure preparations.  Empyreuma is an obsolete chemical and medical term referring to "the smell and taste associated with burning vegetable and animal matter", and likely results in this case from the use of pyroligneous acid (wood acid) or wood acid lime in the preparation of the mordant.

Potassium alum: Potassium alum, potash alum, or potassium aluminum sulfate is a chemical compound: the potassium double sulfate of aluminium.  Its chemical formula is KAl(SO) and it is commonly found in its dodecahydrate form as KAl(SO)·12HO.  Alum is the common name for this chemical compound, given the nomenclature of potassium aluminum sulfate dodecahydrate.  It is commonly used in water purification, leather tanning, dyeing, fireproof textiles, and baking powder.  It also has cosmetic uses as a deodorant, as an aftershave treatment and as a styptic for minor bleeding from shaving.

SUAL Group: Siberian-Urals Aluminium Company (Russian: Сибирско-Уральская Алюминиевая Компания ), commonly known as SUAL (Russian: СУАЛ ), is a fully vertically integrated aluminium company that ranks amongst the world's top ten aluminium producers.  It comprises 19 businesses that are located in nine Russian regions and are involved in the production of bauxite, alumina, primary aluminium, silicon, semi-finished and finished aluminium products.  The Group's revenue for the year ended December 31, 2003 was USD 1.7 billion.  It has some 62,000 employees.

Aluminium oxide: Aluminium oxide (British English) or aluminum oxide (American English) is a chemical compound of aluminium and oxygen with the chemical formula Al O .  It is the most commonly occurring of several aluminium oxides, and specifically identified as aluminium(III) oxide.  It is commonly called alumina, and may also be called aloxide, aloxite, or alundum depending on particular forms or applications.  It occurs naturally in its crystalline polymorphic phase α-AlO as the mineral corundum, varieties of which form the precious gemstones ruby and sapphire.  AlO is significant in its use to produce aluminium metal, as an abrasive owing to its hardness, and as a refractory material owing to its high melting point.

Lead dioxide: Lead(IV) oxide, commonly called lead dioxide or plumbic oxide or anhydrous plumbic acid (sometimes wrongly called lead peroxide ), is a chemical compound with the formula PbO.  It is an oxide where lead is in an oxidation state of +4.  It is of an intermediate bond type, displaying both ionic (e.g. the lattice structure) and covalent (e.g. its low melting point and insolubility in water) properties.  It is an odorless dark-brown crystalline powder which is nearly insoluble in water.  It exists in two crystalline forms.  The alpha phase has orthorhombic symmetry; it was first synthesized in 1941 and was identified in nature as a rare mineral scrutinyite in 1988.  The more common tetragonal beta phase was first identified as the mineral plattnerite around 1845 and later produced synthetically.  Lead dioxide is a strong oxidizing agent which is used in the manufacture of matches, pyrotechnics, dyes and other chemicals.  It also has several important applications in electrochemistry, in particular in the positive plates of lead acid batteries.

Aluminium dodecaboride: Aluminium dodecaboride (AlB) is a chemical compound made from the metal aluminium and the non-metal boron.  It is one of two chemical compounds that are commonly called aluminium boride; the other is aluminium diboride, AlB.

Bharat Aluminium Company: Bharat Aluminium Company Ltd. (BALCO) is an Indian aluminium company.  BALCO was incorporated in the year 1965 as a Public Sector Undertaking (PSU) and it was the Public sector until 2001, when it was taken over by Vedanta Resources, a company listed on the London Stock Exchange.  The Company has been closely associated with the Indian Aluminium Industry, in a pivotal role.

Countercurrent distribution: Countercurrent distribution (CCD, also spelled "co "counter current" distribution) is an analytical chemistry technique which was developed by Lyman C. Craig in the 1940s.  Countercurrent distribution is a separation process that is founded on the principles of liquid-liquid extraction where a chemical compound is distributed (partitioned) between two immiscible liquid phases (oil and water for example) according to its relative solubility in the two phases.  The simplest form of liquid-liquid extraction is the partitioning of a mixture of compounds between two immiscible liquid phases in a separatory funnel.  This occurs in five steps: 1) preparation of the separatory funnel with the two phase solvent system, 2) introduction of the compound mixture into the separatory funnel, 3) vigorous shaking of the separatory funnel to mix the two layers and allow for mass transfer of compounds in and out of the phases, 4) The contents of the separatory funnel are allowed to settle back into two distinct phases and 5) the two phases are separated from each other by draining out the bottom phase.  If a compound is insoluble in the lower phase it will distribute into the upper phase and stay in the separatory funnel.  If a compound is insoluble in the upper phase it will distribute into the lower phase and be removed from the separatory funnel.  If the mixture contains one or more compounds that are soluble in the upper phase and one or more compounds that are soluble in the lower phase, then an extraction has occurred.  Often, an individual compound is soluble to a certain extent in both phases and the extraction is, therefore, incomplete.  The relative solubility of a compound in two phases is known as the partition coefficient.

Alcan: Alcan was a Canadian mining company and aluminium manufacturer.  It was founded in 1902 as the Northern Aluminium Company, Limited, renamed Aluminium Company of Canada, Limited in 1925, and Alcan Aluminium Limited in 1966.  It took the name Alcan Incorporated in 2001.  During that time, it grew to become one of the world’s largest aluminium manufacturers.

Calcium oxide: Calcium oxide (CaO), commonly known as quicklime or burnt lime, is a widely used chemical compound.  It is a white, caustic, alkaline, crystalline solid at room temperature.  The broadly used term "lime" connotes calcium-containing inorganic materials, in which carbonates, oxides and hydroxides of calcium, silicon, magnesium, aluminium, and iron predominate.  By contrast, "quicklime" specifically applies to the single chemical compound calcium oxide.  Calcium oxide that survives processing without reacting in building products such as cement is called free lime.

Supporting paragraphs: SUAL Group Aluminium oxide
Answer: α-AlO