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Demartin F , Gramaccioli C M , Campostrini I , Orlandi P , The Canadian Mineralogist , 46 (2008) p.693-700, Thermessaite, K2[AlF3|SO4], a new ino-aluminofluoride-sulfate from La Fossa crater, Vulcano, Aeolian Islands, Italy, Locality: La Fossa crater, Vulcano, Aeolian Islands, Italy, Note: z-coordinate of S altered
Physical Properties of Thermessaite
Cleavage:
None
Color:
Colorless, White.
Density:
2.79
Diaphaneity:
Transparent
Fracture:
Brittle - Generally displayed by glasses and most non-metallic minerals.
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Thermessaite
Optical Data:
Biaxial (?), b=1.445
Calculated Properties of Thermessaite
Electron Density:
Bulk Density (Electron Density)=2.73 gm/cc note: Specific Gravity of Thermessaite =2.80 gm/cc.
Fermion Index:
Fermion Index = 0.0010231785 Boson Index = 0.9989768215
Photoelectric:
PEThermessaite = 4.23 barns/electron U=PEThermessaite x relectron= 11.56 barns/cc.
Radioactivity:
GRapi = 429.05 (Gamma Ray American Petroleum Institute Units)
Concentration of Thermessaite per GRapi unit = 0.23 (%)
Estimated Radioactivity from Thermessaite - barely detectable