An optical member with the adhesive layer includes the optical member formed of inorganic glass through which light passes; and the adhesive layer formed of an inorganic material or a metal oxide. The inorganic material includes inorganic glass or nitride.

A decorative glass article contains: in mol %, 10% to 70% of La.sub.2O.sub.3, 10% to 90% of Nb.sub.2O.sub.5, 0% to 40% of B.sub.2O.sub.3, and 0% to 50% of TiO.sub.2, wherein a refractive index is 2.0 or more and an Abbe number is 50 or less.

A decorative glass article is substantially free of lead oxide, and has a refractive index of 1.9 or more and an Abbe number of 42 or less.

A decorative glass article is substantially free of lead oxide, and has a refractive index of 1.9 or more and an Abbe number of 42 or less.

Provided is optical glass containing, in terms of mol % of cations: 10 to 60% of a La.sup.3+ component; more than 0% and up to 75% of a Ga.sup.3+ component; and 5 to 75% of a Nb.sup.5+ component, in which a total amount of the La.sup.3+ component, Ga.sup.3+ component, and Nb.sup.5+ component is 60 to 100%.

Provided is optical glass containing, in terms of mol % of cations: 10 to 60% of a La.sup.3+ component; more than 0% and up to 75% of a Ga.sup.3+ component; and 5 to 75% of a Nb.sup.5+ component, in which a total amount of the La.sup.3+ component, Ga.sup.3+ component, and Nb.sup.5+ component is 60 to 100%.

Al.sub.2O.sub.3-rich compositions with desirable hardness and crack resistance for various functional applications. Also disclosed is a method of manufacturing the composition into various dimensions and shapes under a temperature much lower than in conventional methods.

Al.sub.2O.sub.3-rich compositions with desirable hardness and crack resistance for various functional applications. Also disclosed is a method of manufacturing the composition into various dimensions and shapes under a temperature much lower than in conventional methods.

Optically transparent glass ceramic materials comprising a glass phase containing and a crystalline tungsten bronze phase comprising nanoparticles and having the formula M.sub.xWO.sub.3, where M includes at least one H, Li, Na, K, Rb, Cs, Ca, Sr, Ba, Zn, Cu, Ag, Sn, Cd, In, Tl, Pb, Bi, Th, La, Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, Lu, and U, and where 0<x<1. Aluminosilicate and zinc-bismuth-borate glasses comprising at least one of Sm.sub.2O.sub.3, Pr.sub.2O.sub.3, and Er.sub.2O.sub.3 are also provided.

Optically transparent glass ceramic materials comprising a glass phase containing and a crystalline tungsten bronze phase comprising nanoparticles and having the formula M.sub.xWO.sub.3, where M includes at least one H, Li, Na, K, Rb, Cs, Ca, Sr, Ba, Zn, Cu, Ag, Sn, Cd, In, Tl, Pb, Bi, Th, La, Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, Lu, and U, and where 0<x<1. Aluminosilicate and zinc-bismuth-borate glasses comprising at least one of Sm.sub.2O.sub.3, Pr.sub.2O.sub.3, and Er.sub.2O.sub.3 are also provided.