It depends on how you are looking at it. Normally, it appears as a white crystalline powder.
It's a colourless crystalline alkaloid.
It is a colourless crystalline compound.
Melamine
An abrotine is a colourless crystalline alkaloid obtained from abrotanum.
malic acid
Colourless crystals.
salicylic acid salicylic acid
Crystalline is a solid and noncrystalline is a liquid. The word "crystalline" is from the base word "crystal". Salt is an example of a crystalline substance. Noncrystalline sugar is made from crystalline sugar (i.e., granules) and glucose syrup by heating an undissolved mixture of undiluted crystallized sugar and liquid glucose.
glucose
Pure magnesium sulfide (MgS) is a white crystalline solid at room temperature.
Crystalline solids are a class of solids that have regular or nearly regular crystalline structures. This means that the atoms in these solids are arranged in an orderly manner. Examples of crystalline solids are sugar, sugar candy, or rock candy.