Midway home Hashing    Mineral hardness game

When completed this game will feature a line of test minerals at the top of the page which may be dragged over the standard hardness objects below leaving marks. If a mineral is harder than the standard, it cuts the standard, otherwise the mineral crumbles. Ground mineral color will show on the porcelain streak plate at the bottom.

Standard Hardnesses:
Fingernail: 2+,   Copper penny: 3,   knife blade: 5+,   window glass: 5.5,   steel file: 6.5.