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Vermiculite is a 2:1 clay, meaning it has two tetrahedral sheets for every one octahedral sheet. It is a limited-expansion clay with a medium shrink–swell capacity. Vermiculite has a high cation-exchange capacity (CEC) at 100–150 meq/100 g.
This list of mines in South Africa is subsidiary to the list of mines article and lists working, defunct and future mines in the country and is organised by the primary mineral output. For practical purposes stone, marble and other quarries may be included in this list.
On 18 April 2021, the mill was gutted in a fire that had started on Table Mountain and destroyed several buildings, including one of the libraries of the University of Cape Town. [5] [6] The fire also destroyed four thatched houses behind the mill. At the time of the fire, Mostert's Mill was South Africa's oldest working mill. [7]
In the making of firebrick, fire clay is fired in the kiln until it is partly vitrified.For special purposes, the brick may also be glazed. There are two standard sizes of fire brick: 9 in × 4 + 1 ⁄ 2 in × 3 in (229 mm × 114 mm × 76 mm) and 9 in × 4 + 1 ⁄ 2 in × 2 + 1 ⁄ 2 in (229 mm × 114 mm × 64 mm). [2]
Fire clay in a furnace. Fire clay is a range of refractory clays used in the manufacture of ceramics, especially fire brick. The United States Environmental Protection Agency defines fire clay very generally as a "mineral aggregate composed of hydrous silicates of aluminium (Al 2 O 3 ·2SiO 2 ·2H 2 O) with or without free silica." [1]
The 2021 Table Mountain fire (also known as the Rhodes Memorial fire [2] or Cape Town fire [3] [4]) is a major fire that started on 18 April 2021 [5] in and around Table Mountain National Park and the neighbourhoods of Newlands, [2] Rosebank, Mowbray and Rondebosch in Cape Town, South Africa.