ZIRCONIFEROUS SANDSTONE NEAR ASHLAND, VIRGINIA 

 Zirconium-bearing minerals.* 



279 



In addition to the tabular list of minerals above, traces of zireonium 

 are reported in the rare minerals melanocerite, caryocerite, and tritonite, sili- 

 cates of the cerium and yttrium metals, which occur in nepheline syenites 

 in Norway. § Aeschynite may contain zirconium. Homilite, variety erd- 



* Compiled from Dana, E. S., A System of Mineralogy; Hintze, C, Handbuch der 

 Mineralogie; and Iddings, J. P., Igneous Rocks, 1910, vol. i. 



t Maximum percentage given in analyses recorded by Dana, E. S., A System of 

 Mineralogy, 1900, 6th edition. 



t Theoretical percentage. The altered forms of zircon, auerbachite, malacon, 

 oerstedite, tachyaphaltite, and calyptolite are not listed as separate species. 



§ Iddings, J. P., Igneous Rocks, 1910, vol. i, p. 60. 



