Gold containing silicate glass

1. A glass composition comprising:

greater than or equal to 60 mol % and less than or equal to 85 mol % SiO 2 ;

greater than or equal to 0.5 mol % and less than or equal to 20 mol % Al 2 O 3 ;

greater than or equal to 0 mol % and less than or equal to 15 mol % Li 2 O;

greater than or equal to 0.5 mol % and less than or equal to 25 mol % Na 2 O;

greater than or equal to 0.1 mol % and less than or equal to 20 mol % K 2 O;

greater than or equal to 0-2 mol % and less than or equal to 10 mol % CaO;

greater than or equal to 0 mol % and less than or equal to 10 mol % MgO;

greater than or equal to 0.01 mol % and less than or equal to 0.5 mol % Fe 2 O 3 ; and

Au, wherein the concentration of Au in the glass composition is less than or equal to 0.5 mol %.

2. The glass composition of claim 1 , comprising greater than or equal to 61 mol % and less than or equal to 83 mol % SiO 2 .

3. The glass composition of claim 1 , comprising greater than or equal to 1 mol % and less than or equal to 14 mol % Al 2 O 3 .

4. The glass composition of claim 1 , comprising greater than or equal to 2 mol % and less than or equal to 15 mol % Li 2 O.

5. The glass composition of claim 1 , comprising greater than or equal to 1 mol % and less than or equal to 12 mol % Li 2 O.

6. The glass composition of claim 1 , comprising greater than or equal to 2 mol % and less than or equal to 11 mol % Li 2 O.

7. The glass composition of claim 1 , comprising greater than or equal to 5 mol % and less than or equal to 23 mol % Na 2 O.

8. The glass composition of claim 1 , comprising greater than or equal to 0.2 mol % and less than or equal to 15 mol % K 2 O.

9. The glass composition of claim 1 , comprising greater than or equal to 3 mol % and less than or equal to 9 mol % CaO.

10. The glass composition of claim 1 , comprising greater than or equal to 0.5 mol % and less than or equal to 7 mol % MgO.

11. The glass composition of claim 1 , comprising greater than or equal to 0 mol % and less than or equal to 0.5 mol % SnO 2 .

12. The glass composition of claim 1 , comprising greater than or equal to 0.01 mol % and less than or equal to 0.1 mol % Au.

13. A glass article, comprising the glass composition of claim 1 , wherein the glass article comprises an average number of Au particles of less than or equal to 5,000 particles/mm 3 .

14. The glass article of claim 13 , wherein the glass article is colored.

15. A method of forming a glass article, comprising:

melting a batch to form a molten glass, wherein the batch comprises:

greater than or equal to 60 mol % and less than or equal to 85 mol % SiO 2 ;

greater than or equal to 0.5 mol % and less than or equal to 20 mol % Al 2 O 3 ;

greater than or equal to 0 mol % and less than or equal to 15 mol % Li 2 O;

greater than or equal to 0.5 mol % and less than or equal to 25 mol % Na 2 O;

greater than or equal to 0.1 mol % and less than or equal to 20 mol % K 2 O;

greater than or equal to 2 mol % and less than or equal to 10 mol % CaO;

greater than or equal to 0 mol % and less than or equal to 10 mol % MgO;

greater than or equal to 0.01 mol % and less than or equal to 0.5 mol % Fe 2 O 3 ; and

Au, wherein the concentration of Au in the batch is less than or equal to 0.5 mol % Au,

cooling the molten glass to form a glass article.

16. The method of claim 15 , wherein the glass article has an Au retention greater than or equal to 8% when compared to the batch.

17. The method of claim 15 , wherein the glass article has an Au retention greater than or equal to 20% when compared to the batch.

18. The method of claim 15 , wherein the glass article comprises an average number of Au particles of less than or equal to 5,000 particles/mm 3 .

19. The method of claim 15 , wherein the glass article comprises an average number of Au particles of less than or equal to 1,000 particles/mm 3 .

20. The method of claim 15 , wherein the glass article comprises an average number of Au particles of less than or equal to 500 particles/mm 3 .