It means a neutral or a calm expression.
No, not all have glassy luster
It pretty much forms from no crystallization. ;)
No.
Glassy
The mineral with glassy luster, and milky white is Quartz
Usually smooth & translucent.
but not
Her countenance was glowing!
They mean about the same thing. A+
Countenance is the appearance of a calm facial expression. A sample sentence using the word countenance is, Jane's face looked countenance when the dog jumped out in front of her.
face or visage for one meaning of countenance tolerate or accept for another meaning of countenance
Countenance is the outward expression of the face which at any time is able to disclose the inward emotional state of a person's heart.
His countenance turned from pleasant to angry at the words spoken by his boss. In this example countenance refers to facial expression. The company does not countenance corporate espionage. This example means to approve of or tolerate something, in this case corporate espionage.
The countenance refers to the face. Countenances means to approve or at least not object.
blurring means becoming glassy or to lose clear vision.
It is glassy.
The more he was depressed the more his countenance fell.