@rocknoobie,
Tes and the rest will probly ID 'em better than I could but I betcha :
1 (?), 2, 8, 12, 13, 14, 15, 18, 21 be granite (mebbe 25, 26);
5, 9, 22 some sort of volcanic--mebbe basalt-- with sparkly mica inclusion;
7, if shiny, obsidian;
8, 19, 24 quartz; 23 and mebbe 20 (if not calcite, which oft looks a lot like quartz)
10, doubtless mica
If a diluted solution of denatured alky doesn't produce bubbling, then it's probly limestone, calcite. Quartz and similar substances. esp w/silica, and which don't scratch easy, can oft be polished. Doubtless somewhere in there is an example of agate or calcedony (maybe 1) taking nice polish
Thanks Noob for the chance to guess