Lockwood will ID rocks/minerals for you on twitter! I mention this as a public service because mineral IDs aren't really my thing. I know, I know. With my lack of interest in mineralogy and my inability to discuss the structural history of a site on demand, I am in danger of losing my "geological expert" badge.
I'm pretty good with the basics (quartz! various micas!) and some of the more distinctive minerals I may come across, such as pyrite. Given a hand sample with reasonably visible mineral grains, I can come up with a good answer. I will admit that I was recently confused by a rock with what looked exactly like dogtooth calcite (an example from here).
It was actually quartz.
That's why I'm not very good at mineral/rock IDs from afar. I need a screwdriver to poke at it and a hand lens to peer at it from different angles. And most important, I need to know the context - what are the conditions it grew under? What are the other minerals it's associated with? I need a big chunk of rock, and maybe a few different chunks to see variations.
My suggestion for identifying minerals and rocks would be to get a field guide with good photos first, and then ask follow-up questions of internet experts. Sometimes doing your own scratching and turning in the light is all you need.