A Brief Note on Mineral Specimen Size Abbreviations

Size Definitions

Generic DimensionMaximum Dimension in inchesMaximum Dimension in Centimeters
Thumbnail (TN)1 1/43
Miniature (Min)25.0
Small Cabinet (SCab)3 3/49.4
Cabinet (Cab)> 3 3/4> 9.4

Or for a more "gut feeling" approach...

THUMBNAIL: fits in a 1.25 inch square "Perky box" (invented by Willard Perkins to hold small rocks)

MINIATURE: simply a rock that can be squeezed into a 2-inch square box

CABINET: A hand-sized specimen larger than 4 inches (10 cm ) in a dimension

SMALL CABINET: in between Miniature and Cabinet...you can hold it in your palm

TOENAIL: a new division in Tucson show judging - basically they are just barely too big to squeeze in a tn box


If you're looking for a specific fine mineral that you don't see up for auction, check out our retail site at www.iRocks.com.

The Arkenstone has thousands of fine minerals available for sale and specializes in assisting customers curate private mineral collections.