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Three polytypes of chrysotile are known. [8] These are very difficult to distinguish in hand specimens, and polarized light microscopy [6] must normally be used. Some older publications refer to chrysotile as a group of minerals—the three polytypes listed below, and sometimes pecoraite as well—but the 2006 recommendations of the International Mineralogical Association prefer to treat it as ...
The most common asbestiform mineral is chrysotile, commonly called "white asbestos", a magnesium phyllosilicate part of the serpentine group. Other asbestiform minerals include riebeckite, an amphibole whose fibrous form is known as crocidolite or "blue asbestos", and brown asbestos, a cummingtonite-grunerite solid solution series.
Lizardite is a mineral from the serpentine subgroup [3] with formula Mg 3 (Si 2 O 5)(OH) 4, and the most common type of mineral in the subgroup. [4] It is also a member of the kaolinite-serpentine group.
The Sri Lanka shama has glossy blue-black upperparts, bright chestnut underparts, a white rump and white outer tail feathers. The sexes are similar. Compared to the nominate subspecies of white-rumped shama that is present in India, the Sri Lanka shama has a shorter tail, paler belly and less sexual dimorphism. [6]
Measurements of area used in ancient Sri Lanka was a system derived from paddy agriculture. [6] Area was often measured in terms of the land that could be sown with a specific amount of seed or rice, including the Pǣla, Amuna, Kiriya (4 amunas), and the Riyana. In one region, a Kiriya was about 8 acres. [5]
The institution later functioned under the new act of the Sri Lanka Standards Institution Act No. 6 of 1984 replacing the previous outdated act. [2] The organisation works as a regulatory institution and it is a kind of state corporation on behalf of the government mainly to protect consumers from the unethical business trade malpractices.
Rain clouds over a tank in Sri Lanka The tank cascade system ( Sinhala : එල්ලංගාව , romanized: ellaṅgāva ) is an ancient irrigation system spanning the island of Sri Lanka . It is a network of thousands of small irrigation tanks ( Sinhala : වැව , romanized: wewa ) draining to large reservoirs that store rainwater and ...
The national anthem of Sri Lanka "Sri Lanka Matha" is believed to have been written by Rabindranath Tagore [5] and later composed by Ananda Samarakoon in 1940 before the island nation's independence from the British. In 1951, it became the national anthem of Sri Lanka. [6] [7] Firstly, it was written in Sinhalese and translated to Tamil. The ...