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Ferraris G , Abbona F , Bulletin de la Societe Francaise de Mineralogie et de Cristallographie , 95 (1972) p.33-41, The crystal structure of Ca5(HAsO4)2(AsO4)2*4H2O (Sainfeldite), Locality: synthetic
Physical Properties of Sainfeldite
Color:
Colorless, Light pink.
Density:
3.04
Diaphaneity:
Transparent
Habit:
Aggregates - Made of numerous individual crystals or clusters.
Habit:
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Habit:
Rosette - Bundled tabular aggregates resembling rose flower petals.
Hardness:
4 - Fluorite
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Sainfeldite
Gladstone-Dale:
CI meas= -0.014 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= -0.027 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2029,KPDmeas= 0.2002,KC= 0.1975 Ncalc = 1.59 - 1.6