Guide to Mineral Sizes
Here are some abbreviations you may encounter on this site.
MM - Micromineral - a small (typically less than 1") piece of matrix with micro xtls. Unmounted. Strictly speaking, the term "micromineral" depends more on the size of the crystals (or other point of interest) than it does on the size of the matrix.
MT - Micromount - a mounted micro specimen, usually in a standard "micromount" size box. The matrix, where present, is typically 3/8 inch or less in max. dimension. Some micromounts may consist of a single crystal mounted with no matrix.
TN - Thumbnail - fits in a 1.25" x 1.25" x 1.25" box (a standard "Perky" box).
MIN - Miniature - size ranging from about 1.5 inches to about 2.5 inches across max. dimension.
SC - Small cabinet - 2.5 to 4 inches across max. dimensions.
LC - Max. dimension of 4" to 6".
XL - Extra-Large - dimension of 6" or greater.
These size classifications are not universal; different dealers may assign different cutoff points for "miniature", "small cabinet", and so on.
The definitions for TN and MT sized minerals are fairly standard, however, because the box size constrains them.
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Microminerals and Micromounts, A thru L
Microminerals and Micromounts, M thru Z
Minerals A thru L
Minerals M thru Z
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