Alabaster

Alabaster is a semi-crystal of plaster, which is found in tuber forms in soil. It is a transparent type of stone which is, despite its low hardness, very well suited for children in primary classes. The small stones can be treated with just sandpaper. The large stones will be grated first and then finished with sandpaper and wax. The large stones can be made smaller with an old wood saw. Due to the transparency of the stone, this is excellent for the making of crystalline forms during the geological period in the 6th grade.