Ilsemannite, Live Oak County, Texas
Ilsemannite, an alteration product of Molybdenite (bluish clay textured material)
Locality: Live Oak County, Texas
Chemical Formula: Mo3O8 · nH2O
Crystal System: no visible crystal affinities, a dull, clay-like earthy appearance
Specimen size: 3 in x 2 in x 2 in
Specimen weight: 134 grams
In the Arthur E. Smith Collection, on display at Wheaton College, Wheaton, Illinois.