Patent ID: 8722554

Claim:
A mineral material selected from a lithium aluminosilicate glass containing vanadium and a glass-ceramic colored by vanadium containing solid solution(s) of β-quartz and/or β-spodumene as main crystalline phase, advantageously containing a solid solution of β-quartz as main crystalline phase, comprising a composition, free of halides, arsenic oxide and antimony oxide, except for inevitable traces, expressed in percentages by weight of oxides, which contains: from 0.24 to 0.36% of SnO 2 , from 0.030 to 0.060% of V 2 O 5 , and from 0.075 to 0.095% of Fe 2 O 3 ; and a chemical oxygen demand of less than 0.18 mg O 2 /g.