Why would a Metal Detector go off on a piece of slate?

[agalusha5]

We just bought a house in North Hebron, NY and a big flat piece of slate is laid on the ground just off the back step. We were swinging the detector around and it goes off on the corner of the slate. Just that one spot , no where else. and we moved the slate and checked the ground under it. Nothing. The detector says it is Silver money. Does anyone know how, or why and what it means?

 

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[Gypsy Heart]

Geez, Since Slate is a stone formed from clay mud; composed of sediments of decomposed stone and organic matter that has been hardened by heat and pressure, it might have been in the breakdown before the slate formed ..or it could have traces or iron oxide in it.

 

[TreasureTales]

Natural iron is one possibility. The silver reading may not be accurate. Or there's a fissure in the slab in which a nail or coin has been stashed. Or maybe it isn't slate. Hard to say for sure. There are hot rocks that detectors will signal on.

 

[Zincoln Miner]

try flipping the slate over and scan the other side just to see what happens.I
suspect a highly mineralised matrix in the rock giving a highly conductive metal reading(it happens).
as for me I would crack it open to retreive an atlantian's pocket change.

 

[jeff of pa]

If you have a strong magnet see if it sticks to it.
If it Dosn't, crack it open.

Unless the slate has a particular place in your heart,
and you don't want to damage it of course.

 

[Charlie P. (NY)]

Bog iron, leeched in pyrite, meteorite, shell casing from alien hunter.