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out of the melt, 1
 

image

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Fig. 7. Individual Crystals of Willemite
illustrating H. C. Arnold, Investigation of Willemite-Tephroite Soda Glass. Transactions of the American Ceramic Society, Vol XIX. (1917): 674-695

Figure 7 shows one or two crystals that had grown completely out of the melt. Under the high power lens these crystals appear as though they had liquid inclusion. They possess hexagonal cross section.
 

15 February 2013 *
tags: Arnold, H. C.; rounds; transactions; willemite; Zn2SiO4