Streak Plates - Black, 10 pk

ETA hand2mind Streak Planes, 2 x 2", Pack of 10

United Scientific Glass Streak Plates, Pack of 12

White Streak Plates - set of 10

American Educational Glass Streak Plates Kit, 1/4" Thickness (Pack of 10)

Toysmith Mineral Science Kit

Geosciences Industries 13357 Introductory Earth Science Classroom Rocks and Minerals Collection

Deluxe Hardness Pick Set and Mineral Identification Kit, in Wooden Case

American Educational Hardness Collection with Test Kit

Mohs' Hardness Test Kit for Industrial Applications

United Scientific GLP3X2-P Glass Streak Plate, 3" Height X 2" Width X 1/4" Thick (Pack of 10)