Then in 1973 their first fluorite triplet telescope was used too photograph the total solar eclipse on June 29th of that year in Africa.
之后，1973年他们的第一款三片式萤石望远镜用于天文摄影，那年的6月29日在南非发生了日全蚀。Said covering agent may be lime and fluorite and said refining agent uses lime, fluorite and aluminium powder as main raw materials.
覆盖剂可以以石灰和萤石、精炼剂，也可以以石灰、萤石和铝粉为主要原料，深度脱氧可使用铝片或镁片。The transparent colorless fluorite can be used to produce special optical lens.
透明无色的萤石可以用来制作特殊的光学透镜。Purple fluorites were deposited in acid environment of the early stage hydrothermal activity, and occurred nearest to ore bodies.
绿色、白色萤石在热液活动中—晚期于中性介质中沉淀而成，距矿体较远；Other materials affected by Tuesday's ruling include fluorspar, magnesium, manganese, silicon carbide, silicon metal and yellow phosphorus.
受周二裁定影响的其他原材料还有萤石、镁、锰、碳化硅、金属硅和黄磷。The current research results in the floatation technique, floatation agent and floatation theory of fluorite are reviewed and summed up.
对近年来萤石浮选工艺、药剂和理论等方面的研究成果进行了回顾和总结；The materials in question are bauxite, coke, fluorspar, magnesium, manganese, silicon carbide, silicon metal, yellow phosphorous and zinc.
三国申诉所涉及的九种原材料分别是铝土、焦碳、萤石、镁、锰、碳化硅、金属硅、黄磷和锌。Adding ground fluorite powder makes the molten metals more fluid and protects the titanium from air as it cools.
加入萤石粉（即氟化钙）可以使熔融态的金属更具有流动性，并在钛冷却过程中将钛与空气隔绝。Minerals mainly coal, antimony, tungsten, iron, zinc, fluorite, etc. . . In which the province ranks first in the reserves of antimony.
矿产主要有煤、锑、钨、铁、锌、萤石等。其中锑的储量居全省首位。