It varies with the temperature. Glass is brittle at room temperature but becomes soft at high temperature. Glass also does not crystallize so it is considered a liquid even when cool. Spaghetti is brittle when dry but softens as water is absorbed.
Glass is brittle and amorphous.
Window glass is brittle.
Glass is usually brittle and has to be handled with care
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Hardness is the question of how difficult it is to make an impression on a substance. Brittleness is the question of how easy it is to break. Granite is a stone which is very hard but not brittle--it is hard to carve and also hard to break. A plank of wood is not as hard as stone but is not very brittle. You can carve on it with a knife but it won't shatter if you drop it. Glass is hard and brittle. Chalk is not hard but it is brittle.
glass is highly brittle. it is used for insulation and decoration.
WHAT IS RIGID BRITTLE ROCK CALLED? WHAT IS RIGID BRITTLE ROCK CALLED? we have no clue