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Hawthorne F C , Groat L A , Raudsepp M , Ercit T S , Neues Jahrbuch fur Mineralogie, Abhandlungen , 157 (1987) p.121-132, Kieserite, Mg(SO4)(H2O), a titanite-group mineral, Locality: Wathlingen, Hanover, Germany
Physical Properties of Kieserite
Cleavage:
{110} Perfect, {111} Perfect
Color:
Colorless, Green yellow, Gray white, Yellowish, White.
Density:
2.57
Diaphaneity:
Transparent to Translucent
Fracture:
Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Habit:
Massive - Granular - Common texture observed in granite and other igneous rock.
Hardness:
3.5 - Copper Penny
Luster:
Vitreous - Dull
Streak:
white
Optical Properties of Kieserite
Gladstone-Dale:
CI meas= -0.036 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= -0.044 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.214,KPDmeas= 0.2123,KC= 0.2049 Ncalc = 1.52 - 1.53