Provided is a Li.sub.2O-Al.sub.2O.sub.3-SiO.sub.2-based crystallized glass that has a high permeability to light in a ultraviolet to infrared range and is less likely to be broken. A Li.sub.2O-Al.sub.2O.sub.3-SiO.sub.2-based crystallized glass contains, in terms of % by mass, 40 to 90% Si.sub.O2, 5 to 30% Al.sub.2O.sub.3, 1 to 10% Li.sub.2O, 0 to 20% SnO.sub.2, 0 to 5% ZrO.sub.2, 0 to 10% MgO, 0 to 10% P.sub.2O.sub.5, and 0 to 4% TiO.sub.2 and a mass ratio of Li.sub.2O/(MgO+CaO+SrO+BaO+Na.sub.2O+K.sub.2O) is 3 or less.

Provided is a Li.sub.2O-Al.sub.2O.sub.3-SiO.sub.2-based crystallized glass that has a high permeability to light in a ultraviolet to infrared range and is less likely to be broken. A Li.sub.2O-Al.sub.2O.sub.3-SiO.sub.2-based crystallized glass contains, in terms of % by mass, 40 to 90% Si.sub.O2, 5 to 30% Al.sub.2O.sub.3, 1 to 10% Li.sub.2O, 0 to 20% SnO.sub.2, 0 to 5% ZrO.sub.2, 0 to 10% MgO, 0 to 10% P.sub.2O.sub.5, and 0 to 4% TiO.sub.2 and a mass ratio of Li.sub.2O/(MgO+CaO+SrO+BaO+Na.sub.2O+K.sub.2O) is 3 or less.

A colored glass article includes greater than or equal to 50 mol % and less than or equal to 80 mol % SiO.sub.2; greater than or equal to 7 mol % and less than or equal to 25 mol % Al.sub.2O.sub.3; greater than or equal to 1 mol % and less than or equal to 15 mol % B.sub.2O.sub.3; greater than or equal to 5 mol % and less than or equal to 20 mol % Li.sub.2O; greater than or equal to 0.5 mol % and less than or equal to 15 mol % Na.sub.2O; greater than 0 mol % and less than or equal to 1 mol % K.sub.2O; and greater than or equal to 1×10.sup.−6 mol % and less than or equal to 1 mol % Au. R.sub.2O—Al.sub.2O.sub.3 is greater than or equal to −5 mol % and less than or equal to 7 mol %, R.sub.2O being the sum of Li.sub.2O, Na.sub.2O, and K.sub.2O.

A colored glass article includes greater than or equal to 50 mol % and less than or equal to 80 mol % SiO.sub.2; greater than or equal to 7 mol % and less than or equal to 25 mol % Al.sub.2O.sub.3; greater than or equal to 1 mol % and less than or equal to 15 mol % B.sub.2O.sub.3; greater than or equal to 5 mol % and less than or equal to 20 mol % Li.sub.2O; greater than or equal to 0.5 mol % and less than or equal to 15 mol % Na.sub.2O; greater than 0 mol % and less than or equal to 1 mol % K.sub.2O; and greater than or equal to 1×10.sup.−6 mol % and less than or equal to 1 mol % Au. R.sub.2O—Al.sub.2O.sub.3 is greater than or equal to −5 mol % and less than or equal to 7 mol %, R.sub.2O being the sum of Li.sub.2O, Na.sub.2O, and K.sub.2O.

A chemically toughenable or toughened sheet-like glass article is provided. The article has a glass with a composition comprising Al.sub.2O.sub.3, SiO.sub.2, Li.sub.2O, and Na.sub.2O, wherein (Al.sub.2O.sub.3)−(Li.sub.2O+Na.sub.2O), in mol %, is less than 0; a thickness between 0.3 mm and 4 mm; a light transmittance of at least 0.001% to at most 60% at 450 nm, of at least 0.001% to at most 30% at 540 nm, and of at least 0.001% to at most 30% at 630 nm; and an IR transmittance of at least 10% to not more than 99% at any wavelength in a wavelength range from 900 nm to 1100 nm. The light and IR transmittances are determined for a thickness of the article of 1 mm.

An ultraviolet light absorbing glass according to the present invention includes 1.6% or more of t-Fe.sub.2O.sub.3, more than 1.0% of TiO.sub.2, and 0.016% or more of CoO. The ultraviolet light absorbing glass has t-Fe.sub.2O.sub.3/TiO.sub.2 of 1.2 or more, and an ultraviolet light transmittance (TUV400) at a sheet thickness of 3.1 mm of 2.0% or less, a ratio of visible light transmittance (TVA)/TUV400 of 10 or more, and a dominant wavelength (λD) of 555 nm or less.

An ultraviolet light absorbing glass according to the present invention includes 1.6% or more of t-Fe.sub.2O.sub.3, more than 1.0% of TiO.sub.2, and 0.016% or more of CoO. The ultraviolet light absorbing glass has t-Fe.sub.2O.sub.3/TiO.sub.2 of 1.2 or more, and an ultraviolet light transmittance (TUV400) at a sheet thickness of 3.1 mm of 2.0% or less, a ratio of visible light transmittance (TVA)/TUV400 of 10 or more, and a dominant wavelength (λD) of 555 nm or less.

The present invention discloses a glass material, and a preparation method and a product thereof. The glass material contains a lithium salt crystalline phase and a phosphate crystalline phase. For the entire material, the crystallinity is 40-95%, the lithium salt crystalline phase accounts for 40-90 wt % of the entire material, and the phosphate crystalline phase accounts for 2-15 wt % of the entire material, wherein the lithium salt crystalline phase is one or more of lithium silicate, lithium disilicate and petalite, and the phosphate crystalline phase is aluminum phosphate or/and aluminum metaphosphate. After the glass material of the present invention is toughened, the Vickers hardness (Hv) is 900 kgf/mm.sup.2 or above. The glass material or a substrate of the present invention is suitable for protective members such as mobile terminal equipment and optical equipment and has high hardness and strength. Furthermore, the present invention may also be used for other decorations such as outer frame members of portable electronic equipment.

The present invention discloses a glass material, and a preparation method and a product thereof. The glass material contains a lithium salt crystalline phase and a phosphate crystalline phase. For the entire material, the crystallinity is 40-95%, the lithium salt crystalline phase accounts for 40-90 wt % of the entire material, and the phosphate crystalline phase accounts for 2-15 wt % of the entire material, wherein the lithium salt crystalline phase is one or more of lithium silicate, lithium disilicate and petalite, and the phosphate crystalline phase is aluminum phosphate or/and aluminum metaphosphate. After the glass material of the present invention is toughened, the Vickers hardness (Hv) is 900 kgf/mm.sup.2 or above. The glass material or a substrate of the present invention is suitable for protective members such as mobile terminal equipment and optical equipment and has high hardness and strength. Furthermore, the present invention may also be used for other decorations such as outer frame members of portable electronic equipment.

A glass composition includes SiO.sub.2, Al.sub.2O.sub.3, optionally B.sub.2O.sub.3, optionally Li.sub.2O, Na.sub.2O, optionally K.sub.2O, optionally CaO, optionally MgO; and optionally ZnO in certain ranges. R.sub.2O+R′O is less than or equal to 25 mol %, where R.sub.2O is the sum of Li.sub.2O, Na.sub.2O, and K.sub.2O and R′O is the sum of CaO, MgO, and ZnO. And, the glass composition includes colorants, such as NiO, CO.sub.3O.sub.4, Cr.sub.2O.sub.3, CuO, and CeO.sub.2 in certain ranges. Further, the constituents are arranged so as to facilitate low diectric, high toughness, desired color, and high strength.