
Celsian is a barium feldspar with a chemical composition BaAl2Si2O8. It forms part of the feldspar group and belongs to the celsian- series and the celsian- series. It has some resemblance to , and it has four distinct . The essential elements are silicon, aluminum, oxygen, and barium. Some common impurities in the mineral are iron, titanium, magnesium, potassium, and calcium. Celsian is stable from room temperature up to 1590 °C (Li. [pdf]
Celsian has very attractive features such as chemical stability and high mechanical resistance, which can be favourably exploited in order to obtain enhanced-performance composites with respect to bulk glass. (Cannillo, Carlier, Manfredini, Montorsi, and Siligardi 2006).
Celsian is an uncommon feldspar mineral, barium aluminosilicate, Ba Al 2 Si 2 O 8. The mineral occurs in contact metamorphic rocks with significant barium content. Its crystal system is monoclinic, and it is white, yellow, or transparent in appearance. In pure form, it is transparent.
The symmetry in celsian is somewhat different from the symmetry normally found in feldspars. It is monoclinic with a body centered lattice similar to those of anorthite. Insufficient evidence has been found to suggest that celsian lacks a center of symmetry, so its space group is I 2/c (Newnham and Megaw, 1960).
It has some resemblance to anorthite, and it has four distinct polymorphs. The essential elements are silicon, aluminum, oxygen, and barium. Some common impurities in the mineral are iron, titanium, magnesium, potassium, and calcium. Celsian is stable from room temperature up to 1590 °C (Lin and Foster, 1968).
There are four distinctive polymorphs of celsian, two of them are the natural minerals and the other two are synthetic products. The first are paracelsian and celsian, the second ones are hexacelsian and the other one is related to the mineral cymrite (Lin and foster, 1967).

Sephu plant will serve as an addition to the 180 kW grid-connected ground-mounted solar photovoltaic power station in Rubesa (near ), which became operational in October 2021. The Sephu plant is currently under construction over an area of 65 acres in Yongtru village, situated in the . Upon its completion, the overall installed capacity of the facility will reach 22.38 megawatts and is expected to be complete by March 2025. It was initially planned. [pdf]
The Sephu project will be Bhutan’s largest solar facility. Credit: Bhutan ministry of energy and natural resources The Bhutanese government has started construction on the country’s first utility-scale solar farm, the Sephu solar project, which boasts a capacity of 17.38MW.
“We did the studies on renewable energy management master planning in 2016 and the reports say Bhutan has a capacity for 12 Giga watts of solar energy and 760 MW of wind so we have a lot to tap as there is a lot of opportunity for solar energy solar power to grow in Bhutan. There is a lot of potential and I think this is the right step.”
The Bhutanese government has started construction on the country’s first utility-scale solar farm, the 17.38MW Sephu solar project.
The Prime Minister Dasho Dr Lotay Tshering was the Chief Guest. Bhutan Solar Initiative Project (BSIP) set up under Royal Command has implemented two Solar PV Projects in Thimphu. 250kW Rooftop Centenary Farmers Market (CMF) and 500kW Ground mounted at Dechencholing.
In 2021, the first planned mega solar power plant, a 30 megawatt, in Shingkhar Bumthang was dropped because the community refused to give clearance for various reasons. The plant was expected to generate 46.19 million units of energy annually with an annual revenue generation of Nu 233.725 million.
Minister of Energy and Natural Resources, Loknath Sharma said, “Sephu solar plant is the first medium solar farm in the country.” The minister said that Sephu solar plant marked the beginning of achieving a 500-megawatt energy target through solar power in the next three years. He said that the plant project is undertaken by the ministry.

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