It could be calcite or quartz (out of the commoner possibilities). If you can scratch it with a steel knife it is calcite; if not, it is quartz.
The sparkly dark mineral: yes, I think galena's a good guess. The small grain size makes it impossible for me to see crystal faces which might confirm that or not. The softness supports the galena idea; well done for testing it.
My brother in law, John (who died not so long ago, unfortunately), and I collected some good chunks of galena in the Yorkshire Pennines many years ago. We smelted them in a little crucible to see if we could extract the lead. And we did! Thanks for reminding me of that little nugget of our past.