AN UNBIASED VIEW OF GLUCOSAMINE CHONDROITIN

Sphalerite crystal partially encased in calcite through the Devonian Milwaukee Formation of Wisconsin The sulfide minerals are chemical compounds of a number of metals or semimetals having a chalcogen or pnictogen, of which sulfur is most common. Tellurium, arsenic, or selenium can substitute for the sulfur. Sulfides are typically delicate, brittle