Do you have back issues of Garden Gate available for sale? a. We no longer have individual back issues available for purchase; however, we do have annual volumes.
Very good Topaz crystals also come from the Jos Plateau, Plateau State, Nigeria. In Mexico, a famous locality that produces multicolored Topaz with brownish-red tints is Tepetate, San Luis PotosÃ­; along with the Veronica Mine, Copetillo; and Villa Garcia, Zacatecas.
Topaz is a silicate mineral of aluminium and fluorine with the chemical formula Al2SiO42. Topaz crystallizes in the orthorhombic system, and its crystals are mostly prismatic terminated by pyramidal and other faces. It is one of the hardest naturally occurring minerals and is the hardest of any silicate mineral. This hardness combined with its usual transparency and variety of colors means that it has acquired wide use in jewellery as a cut gemstone as well as for intaglios and other gemstone ca