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Crystal Structure:
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Hertweck B , Giester G , Libowitzky E , American Mineralogist , 86 (2001) p.1282-1292, The crystal structures of the low-temperature phases of leonite-type compounds,, K2Me(SO4)2.4H2O (Me=Mg,Mn,Fe), Sample: K2Mg(SO4)2.4H2O, T = 100 K
Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Hardness:
2.5-3 - Finger Nail-Calcite
Luster:
Vitreous - Waxy
Streak:
white
Optical Properties of Leonite
Gladstone-Dale:
CI meas= -0.013 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= -0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2184,KPDmeas= 0.2193,KC= 0.2164 Ncalc = 1.48