He taught her the practical aspects of applying X-ray crystallography to amorphous substances.

The catalyst silica-alumina is an amorphous substance which is not an aluminosilicate compound.

Usually, it condensed out of the amorphous colorless substance of the Overworld only a short distance away.

There have been several recent proposals to amend the definition to consider biogenic or amorphous substances as minerals.

Lawrence picked up a tall vertical cylinder, the lower third of which was filled with an amorphous gray substance.

These tend to be an amorphous sticky substance.

Glass is an amorphous substance which has properties of a solid and the structure of a liquid.

It is described as a yellowish brown amorphous substance.

It was reported for an amorphous substance associated with sulfate minerals and embedded in a halite crystal cluster.

Once he'd lit them he had about an hour before they burned down' Thomas looked at the amorphous black substances.