brick colored block?

They look like nice concrete block(CMUs). I have seen similar units in the U.S. and many other countries in various sizes. I saw some 6" thick units (4x16 face) used for loadbearing walls on 12 story buildings.

The aggregate is finer than a typical block that uses a harsh aggregate that does not give a good sheen and texture.

Whoever made the block used a good mold design with flush ends, a center web and wider "mortar bed". They were probaly delivered with the bottom side (as manufactured) and flipped to get the wide mortar bed area on the top. They will work for heavy duty and the high rises. I saw some internationally where they used a larger face (4x16) because of the size of the buildings and walls. Some had 2 webs at 8" on center with open ends for use in partially reinforced walls and 6" L corners..

Aggregate may have been a graded sand with some small limestone chips and a red synthetic iron oxide pigment (not natural). There are many "tricks" that can be done to manufacture variable colored veined units.

Just a guess based on what I could see.

fjn-

I was a little puzzled by the texture of the masonry units since they did in someway look like a clay product that had sand in it, but it also looked like a concrete product the had a very fine texture that could hold a lot of water during manufacturing without bulging.

The apparent "motar beds" on the inside of the face shell and the "hand holds" on the webs core look like those common in many concrete products. I do not know of many clay products that tapered cores since they are extruded, but a cast, pressed brick could have contoured cores.

The color would come from the clay deposits, while iron oxides can be used for and permanent color in concrete products.

Indiana does use a lot of brick because of it location in comparison the concrete products. Whatever material, it looks like a part of a quality wall.