"Callais" redirects here. For the U.S. Supreme Court case, see Louisiana v. Callais.
An example of a variscite "callaïs" necklace of Neolithic origin, dated 4500 - 4000 BC, found in Arzon. The necklace now located in the Musée d'Histoire et d'Archéologie de Vannes.
12La parure en callaïs du néolithique européen. G. Querré, Serge Cassen, Emmanuel Vigier. Oxford. 2019. pp.85, 423. ISBN978-1-78969-281-5. OCLC1128026690.{{cite book}}: CS1 maint: location missing publisher (link) CS1 maint: others (link)
123Cassen, Serge; Petrequin, Pierre; Guirec, Querre; Grimaud, Valentin; Rodriguez-Rellan, Carlos (2019). "Spaces and signs for the transfer of jade and callaïs in the Neolithic of Western Europe". A taste for green: a global perspective on ancient jade, turquoise and variscite exchange. Carlos Rodríguez-Rellán, Ben A. Nelson, Ramón Fábregas Valcarce. Oxford. pp.122–132. ISBN978-1-78925-277-4. OCLC1129585280.{{cite book}}: CS1 maint: location missing publisher (link)
↑Rodriguez-Rellan, Carlos; Fábregas Valcarce, Ramón; Faustino Carvalho, António (2019). "From the green belt: an appraisal on the circulation of Western Iberian variscite". A Taste for Green: A global perspective on ancient jade, turquoise and variscite exchange. Carlos Rodríguez-Rellán, Ben A. Nelson, and Ramón Fábregas Valcarce. Oxford, England: Oxbow Books. pp.77–96. ISBN978-1-78925-277-4. OCLC1129585280.