A static photograph can’t adequately show sparkles, often the most joyous character of a rock, gem, or mineral.
Here’s a static photo of rose muscovite, an absolute star in the sun:
We see poorly defined points of light but not sparkles. Perhaps a hint of sheen. If this rock is put into absolutely perfect focus those spots will disappear completely.
Contrast this to a dynamic portrayal of the same rock. Watch the video all the way through.
Amazing difference, eh?
When looking at a photograph of a rock, gem, and mineral, you may not be getting the whole picture. When out in the field, even in country full of volcanic material, watch for sparkles. Some of those rocks shine. Just not in pictures.