Earthy, porous calcareous tufa.
Ordering information: WARD’S offers different specimen sizes to meet your various needs. Student specimens are ideal for students to use for study and identification. Specimens range in size from 1×1" to 1×2" and come in packages of ten. Bulk pack includes several of the smaller pieces are suitable for classroom study, while the larger specimens in the one kilogram pack can be cut to sizes that meet your specific needs. The number and size of pieces will vary.