Small Crystal Clusters?

[Antje]

Why do all my threads have question marks? Sorry. Habit when extremely unsure on a topic- like any rock/mineral. Civil War buff, might be a lot less tepid there!

These are from here in PA, I'm guessing the experts will recognize them as common here. The close-up is from a crack in one rock, can't find the photo of the entire thing, rats! Just love them- sometimes they'
re yellowish most frequently clear. Haven't found any really large ( as in by the crystals themselves ) ones yet. They've all been these smaller crystals in clusters.

 

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[Indian Steve]

Nice!

 

[Las Vegas Bob]

Quartz crystals, nice find

 

[Antje]

If there are small clusters like these, is it likely there are larger crystals or do these tend to form just a certain size - if this is what's here, then that is what the area tends to produce?