I have an earth-like planet in a fantasy setting with two moons, one of them made of crystal. It will be a fantasy crystal, properties TBD (probably by some of the answers to this question).
My main question is, would I be "ruining" night time by putting a solid crystal moon in the sky of my world? I'm not trying to fully turn night into day here.
I'm not sure I can really picture what this would look like, how the sun would interact with a crystal moon. I imagine, no more moon phases... but would the intensity of light from the moon change depending on the angle the sun hits it (not looking for math just in general)? Could it cast prismatic rainbows on the planet sometimes or all the time? And would it be dangerous at a solar eclipse, whether from intensified sun beams or extreme brightness?
If this moon would be too bright, is there a compromise I could achieve, like say, making the moon just 50% crystal? Or making sure the core is fully opaque and can't transmit light through the entire moon?