Dickthomssenite Locality: Vanadium Queen Mine, La Sal Creek Canyon, Paradox Valley District, Paradox Valley, San Juan Co., Utah, USA Acicular Dickthomssenite xls, field of view 4 mm. Depth of field is achieved with CombineZM. Specimen and photo; Leon Hupperichs. — Photo: Leon Hupperichs · CC BY-SA 3.0
Dickthomssenite
Dickthomssenite is an IMA-recognized mineral species in the vanadate class, with the chemical formula MgV₂O₆·7H₂O.
It crystallizes in the monoclinic crystal system (space group C2/c).
Key properties: Mohs hardness 2.5; specific gravity 1.96; White streak; Vitreous luster; optically biaxial.
IMA symbol Dth, IMA status: approved, named in 2000.
Found in the oxidized zone of a sandstone U–V deposit.
It is found associated with Pascoite, sherwoodite, selenium.
The mineral was named to honor Richard Wyatt?? Thomssen (1933–), American economic geologist and collector of microscopic mineral specimens, Dayton, Nevada, USA.