I dug this cobble from Stainton Quarry and as with the majority of the whinstone ive tested in this area, it attracts a magnet.
As far as i can gather at this preseant time the Andesite dyke stone from this area has never been reported as magnetic ie attract a magnet
The fact that this cobble attracts the magnet, and others I've tested in the old Stainton quarry workings, makes it clear that for some reason the dyke stone in the Stainton area has a different make up than that of other stretches of the dyke, one being the outcrop about a mile north west at Stainsby beck, the dyke stone in the outcrop did not hold the same magnet, yet a layer of broken down whinstone laying between two separate clay deposits above the dyke outcrop was all magnetic?
For more info and images regarding my research into other magnetic minerals please click the link below.
