THE MINERAL SCHROCKINGERITE
- Chemistry: NaCa3UO2SO4(CO3)3F - 10H2O,
Hydrated Sodium Calcium Uranyl Sulfate Carbonate Fluoride.
- Class: Carbonates
- Uses: As a very insignificant source of uranium and as mineral specimens.
Schrockingerite, also spelled schroeckingerite
is one of the few uranyl carbonate minerals that is found on the mineral markets.
Other uranyl carbonates include
Schrockingerite, in addition to having a uranyl
(UO2) group in its chemistry,
has a sulfate ion.
Schrockingerite could be classified as a
but is here classified as a
due to the greater number and therefore greater significance of the carbonate ions.
Other sulfate carbonates include
The fact that schrockingerite is a uranyl sulfate carbonate though makes it very rare.
Schrockingerite forms as a secondary mineral and is also found on cave and mine walls.
- Color is yellow-green.
- Luster is vitreous to pearly.
- Transparency: Crystals are transparent to translucent.
- Crystal System is triclinic.
- Crystal Habits include pseudohexagonal platy crystals and encrustations.
- Cleavage is perfect in one direction.
- Hardness is 2.5.
- Specific Gravity is 2.5 - 2.6 (slightly below average for a translucent mineral)
- Streak is slightly off-white.
- Other Characteristics Some specimens are
- Associated Minerals include clays,
and other secondary uranium minerals.
- Notable Occurrences include the type locality of
Jachymov, Zapadocesky kraj, Czech Republic as well as
the Miller Ranch deposit, Kern County, California; Hillside Mine,
Yavapai County, Arizona and Lost Creek, Sweetwater, Wyoming, USA;
La Soberania Mine, San Isidro, Mendoza, Argentina.
- Best Field Indicators: Crystal habit, color, associations,
fluorescence and locality.