Glass chalice and paten?

I go to daily Mass in the building in which I work. One of the priests (the pastor) uses a smoked glass chalice and paten for the consecration and Holy Communion. I always thought that a “precious metal” had to be used – not glass or wood or other porous or breakable material.

Is there a canon code or ruling in the GIRM that specifies the type of material that must be used in the chalice, ciborium, and paten?

Redemptionis Sacramentum:

  1. Sacred Vessels

[117.] Sacred vessels for containing the Body and Blood of the Lord must be made in strict conformity with the norms of tradition and of the liturgical books. The Bishops’ Conferences have the faculty to decide whether it is appropriate, once their decisions have been given the *recognitio *by the Apostolic See, for sacred vessels to be made of other solid materials as well. It is strictly required, however, that such materials be truly noble in the common estimation within a given region, so that honour will be given to the Lord by their use, and all risk of diminishing the doctrine of the Real Presence of Christ in the Eucharistic species in the eyes of the faithful will be avoided. Reprobated, therefore, is any practice of using for the celebration of Mass common vessels, or others lacking in quality, or devoid of all artistic merit or which are mere containers, as also other vessels made from glass, earthenware, clay, or other materials that break easily. This norm is to be applied even as regards metals and other materials that easily rust or deteriorate.

Glass vessels are explicitly prohibited.

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