Glass plate and window

A glass plate having a radio transmittance of at least 20% at a frequency of 100 GHz as calculated as 18 mm thickness,

• wherein the glass plate contains, as represented by mol % based on oxides, the following components in the following contents:
• 55≤SiO2≤75
• 1.44≤Al2O3≤9
• 0≤B2O3≤2
• 0≤MgO≤15
• 0≤CaO≤20
• 0≤SrO≤15
• 0≤BaO≤1
• 0.01≤Li2O≤19.1
• 0≤Na2O≤16
• 0.9≤K2O≤16
• 0≤ZrO2≤2
• 0.001≤Fe2O3≤5
• 0.001≤TiO2≤5
• 0.91≤R2O≤20
• 0≤RO≤20
• 98≤SiO2+Al2O3+MgO+CaO+SrO+BaO+Li2O+Na2O+K2O+Fe2O3+TiO2≤100
• 10≤7Al2O3+3MgO-4Li2O≤66
• 0≤Na2O/R2O≤0.8
• 0≤PbO<0.001,
• wherein R2O is a total content of alkali metal oxides, and RO is a total content of MgO, CaO, SrO, and BaO.