I believe these are adobe bricks. There was a long line of them along the fence by a very rural, bumpy road. The home on the property looked like it could have been adobe, although it was very modern. Adobe homes are supposed to allow for much more insulation in hot climates but not much durability in any type of seismic action, which we do have a bit of here. Well, I thought these were pretty cool!

"Unless the Lord builds the house, its builders labor in vain." Psalm 127:1