Tin(II) sulfide Tin(II) sulfide Tin(II) sulfide is a chemical compound of tin and sulfur. The chemical formula is SnS. Its natural occurrence concerns herzenbergite (α-SnS), a rare mineral. At elevated temperatures above 905K, SnS undergoes a second order phase transition to β-SnS (space group: cmcm, No. 63). in recent years, it has become evident that a new polymorph of SnS exist based upon the cubic crystal system, π-SnS (space group: P23, No. 198). Tin(II) sulfide can be prepared by reacting tin with sulfur, or tin(II) chloride with hydrogen sulfide. Tin(II) sulfide is a dark brown or black solid, insoluble in water, but
Diplomatic gift A 2012 gift of a "British" table tennis table to President Obama seemed ideal until it was revealed that it was designed in Britain but made in China, evoking worries about the decline of British manufacturing industry. Diplomatic gifts take diverse forms: Diplomatic gift A diplomatic gift is a gift given by a diplomat, politician or leader when visiting a foreign country. Usually the gift is reciprocated by the host. The use of diplomatic gifts dates back to the ancient world and givers have competed to outdo each other in the lavishness of their gifts. Examples include silks given to