Hi Kim, first question, what is the matrix? It looks like maybe a limestone or dolostone. These minerals commonly form in pockets in dolostone. If so, check the geology of the area you think this is from (an area known as Gladwyne) by turning on the macrostrat geology layer in the mindat map for the locality. I did this and the area is schist and ultramafic rock - not at all like your matrix. The label seems very specific, but all it really gives is a hill name in the vast state of Pennsylvania! Because the geology doesnt look like your matrix, then it is likely from a different Linden Hill. But assuming it is, if we across the Schulkyll River and go further NE we end up in terrane underlain by the Ledger Dolostone. It has big quarries in it, like the one north of Lafayette Hill.

Searching for "Linden Hill, PA" on the web I found a Linden Way in King of Prussia, and NE of it is a flooded quarry in the Ledger Dolostone again. I know "Linden Way" isn't a hill, but often road names get their inspiration from old topo or historic features - although no hill is marked there with a triangle on open street map. I ended up with some specimens from that quarry from a fellow here in Connecticut who is now close to 80 and lived near it decades ago. Because it was obviously a collectible place way back, it's another possibility.

There is a website I commonly use called Historicaerials.com for researching old localities. The Bridgeport and King of Prussia area has had a very long history of stone quarrying so you might have some difficulty.  

The "Limestone Quarry" link that Harold provided I believe was called the Dekalb Quarry, according to this brief webpage provided by the King of Prussia Historical Society and is now a reservoir. https://www.kophistory.org/upper-merion-reservoir/