Every stone thrown at the Olympic curling tournaments comes from the same place — the remote island of Ailsa Craig, off the Scottish coast.

Occurrences of gem ruby and sapphire in Thailand are located in the provinces of Chanthaburi-Trat, Kanchanaburi, Phrae-Sukhothai, Ubon Ratchathani, Si Sa Ket, and Phetchabun (figure 1). However, a few ...

A net of pegmatite veins crosscut gneiss and dismembered ophiolitic ultramafic rocks are abundant in the Migif-Hafafit culmination area, South Eastern Desert, Egypt. Some of these pegmatites are ...

IN view of Dr. Bailey's remarks it must be admitted that my phrase “carbonatites show little evidence of assimilation on this scale” was rather ill-chosen. Near the margins of carbonatite plugs ...