What Manufacturers Really Mean By Natural And Artificial Flavors Like many shoppers, I find food labels confusing. In most circumstances, the implications of âartificialâ and naturalâ are pretty clear.
Hydroxylapatite, also called hydroxyapatite (HA), is a naturally occurring mineral form of calcium apatite with the formula Ca 5 (PO 4) 3 (OH), but is usually written Ca 10 (PO 4) 6 (OH) 2 to denote that the crystal unit cell comprises two entities. Hydroxylapatite is the hydroxyl endmember of the complex apatite group.
black, metacinnabar (Î²-HgS), is less common in nature and adopts the zinc blende (T 2 d-F 4 3m) crystal structure. Crystals of red, Î±-HgS, are optically active. This is caused by the Hg-S helices in the structure. Preparation and chemistry. Î²-HgS is precipitated as a black powder when H 2 S is bubbled through solutions of Hg(II) salts. Î²-HgS is unreactive to all but concentrated acids. Mercury metal is produced from the cinnabar ore by roasting in air and condensing the vapour. Uses. When Î±-HgS is used as a red pigment, it is known as vermilion.