Feldspar group; calcium end member plagioclase crystals in pyroxene matrix.
WARD’S offers four different specimen sizes to meet your various needs:
Student Specimens. Ideal for students to use for study and identification. Specimens range in size from 1" x 1" to 1" x 2" and come in packages of ten.
Hand Specimens. Great for lectures, demonstrations, and display. Specimens range in size from 2" x 3" to 3" x 4", and each comes in a labeled plastic tray.
Bulk Pack. 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.