Mathesiusite

Mathesiusite
General
Category	Mineral
Formula; (repeating unit)	K5(UO2)4(SO4)4(VO5)·4(H2O)
Crystal system	Tetragonal
Identification
Color	Yellowish green
Cleavage	Perfect
Fracture	Irregular/Uneven
Tenacity	Brittle
Mohs scale hardness	2
Streak	Greenish white
Density	4.02 g/cm3 (calculated)

Mathesiusite is a sulfate mineral containing potassium, vanadium, and uranium and has the chemical formula: K₅(UO₂)₄(SO₄)₄(VO₅)·4(H₂O). It is a secondary mineral formed during post-mining processes.

It was discovered in Jáchymov mining district, Czech Republic and named in 2013 after Johannes Mathesius (1504–1565), who studied minerals from the area (known then as Joachimsthal, Bohemia).^[1]

References

↑ Plášil, J.; Veselovský, F.; Hloušek, J.; Škoda, R.; Novák, M.; Sejkora, J.; Čejka, J.; Škácha, P.; Kasatkin, A.V (April 1, 2014). "Mathesiusite, K5(UO2)4(SO4)4(VO5)(H2O)4, a new uranyl vanadate-sulfate from Jáchymov, Czech Republic". American Mineralogist. 99 (4): 625–632. doi:10.2138/am.2014.4681. Retrieved 13 June 2017.

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[1] Plášil, J.; Veselovský, F.; Hloušek, J.; Škoda, R.; Novák, M.; Sejkora, J.; Čejka, J.; Škácha, P.; Kasatkin, A.V (April 1, 2014). "Mathesiusite, K5(UO2)4(SO4)4(VO5)(H2O)4, a new uranyl vanadate-sulfate from Jáchymov, Czech Republic". American Mineralogist. 99 (4): 625–632. doi:10.2138/am.2014.4681. Retrieved 13 June 2017.