clockwise v anticlockwise

[Rainbowmand]

Today I asked my pendulum which crystals I should wear. I have done this before, and selected 5 or 6 crystals, then held the pendulum over them, and it responded yes to the one chosen, by swinging back and to, and no to the others, by swinging in a circular movement. However, today, I selected 5 crystals, green quartz, sodalite, mahogany obsidian, aventurine and a necklace of aventurine, sodalite and agate, laid out in this order, for no particular reason. My pendulum immediately responded yes to the green quartz, so then I held it over the others just to confirm this. However, when I held it over the sodalite, which is wrapped in copper wire, it hesitated for a bit, then swung round, for no, but I thought it looked different somehow. When I held my pendulum over the other three, it responded no, swinging in a clockwise direction each time. I then realised that it had swung anticlockwise over sodalite. I have never noticed this before, so now I'm going to have to pay more attention to whether it swings clockwise or anticlockwise. Could it have something to do with the copper do you think, and what does this mean?