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Hawthorne F C , Tschermaks Mineralogische und Petrographische Mitteilungen , 34 (1985) p.15-24, The crystal structure of stringhamite, Locality: Christmas mine, Pinal County, Arizona, USA
Physical Properties of Stringhamite
Cleavage:
{001} Good, {100} Imperfect
Color:
Azure, Blue violet, Dark blue.
Density:
3.67
Diaphaneity:
Transparent to Translucent
Habit:
Aggregates - Made of numerous individual crystals or clusters.
Luster:
Vitreous (Glassy)
Streak:
light blue
Optical Properties of Stringhamite
Gladstone-Dale:
CI meas= 0.094 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= 0.086 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1973,KPDmeas= 0.1957,KC= 0.216 Ncalc = 1.79