Formula: K_1.5-x(Ca,Y,REE)₅(Si₆O₁₅)(Si₂O₇)(OH,F)₂ · yH₂O

Species:

Colour: Pink, red-brown, raspberry-red

Lustre: Vitreous

Hardness: 5½ – 6

Specific Gravity: 2.84 – 2.93

Crystal System: Triclinic

Name: Named by Waldemar T. Schaller in honor of Dr. Hugh Dinsmore Miser (1884–1969), geologist with the U.S. Geological Survey. This was a renaming of the inappropriately named natroxonotlite.

Type Locality: North Wilson pit, Union Carbide Mine, Wilson Springs (Potash Sulfur Springs), Garland County, Arkansas – USA