There is a movie I caught a glimpse of as a young child, and it has been bothering me that I have no idea what move it is.
This must have been right around 1990, and I saw it on TV, so presumably the movie was from the mid to late eighties (though it could of course be older).
I really only remember a single scene from the movie
A girl with blonde hair sat on her knees (I think), she had her palms resting on some sort of glass pyramid, which was glowing with a white/yellow light. She was screaming in some language, I got the feeling she was summoning some powers of some kind. There was a man there too, who I believe managed to stop her from whatever she was doing. If I remember correctly, he seemed to care about her, so it was not that they were enemies, but for some reason he wanted to stop her from performing the "ritual" or whatever it should be called.
Now, I only have a vague recollection of the scene, and I'm not 100% sure it was a pyramid she was holding her hands against, but it was definitely some sort of glowing pane of glass. She seemed to possess some power which the man thought was dangerous.
There is also a chance it could have been a TV show, and not a movie. It was live-action, and I assume based on the scene I remember that it was in the sci-fi or fantasy genres.