The chalice symbolizes the Goddess and fertility, and is associated with the element of Water. The chalice is used to hold ritual beverages and drink offerings, as well as to enact The Great Rite, in which the bowl represents the womb of the Goddess. In this aspect, the chalice represents the power of the Goddess as mother of all creation.
The chalice may be made of any material: silver, brass, gold, glass, crystal, etc. It may be used to confer blessings up those who drink from it by blessing the liquid within.
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Sources:
Lewis-Highcorrell, Rev. Don. Witch School: First Degree. Llewellyn Publications, 2005.
Cunningham, Scott. Wicca: A Guide for the Solitary Practitioner. Llewellyn Publications, 1989.
Cunningham, Scott. Living Wicca: A Further Guide for the Solitary Practitioner. Llewellyn Publications, 1993.
Chamberlain, Lisa. Wicca Altar and Tools: A Beginner’s Guide to Wiccan Altars, Tools for Spellwork, and Casting the Circle. CreateSpace Independent Publishing Platform, 2015.