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Crystal Structure:
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Moore P B , American Mineralogist , 51 (1966) p.168-176, The crystal structure of metastrengite and its relationship to strengite and, phosphophyllite
Physical Properties of Phosphosiderite
Cleavage:
{010} Perfect, {001} Distinct
Color:
Colorless, Purple, Pink, Red, Red violet.
Density:
2.76
Diaphaneity:
Transparent to Translucent
Fracture:
Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Habit:
Encrustations - Forms crust-like aggregates on matrix.
Habit:
Spherical - Spherical, rounded aggregates.
Hardness:
3.5-4 - Copper Penny-Fluorite
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Phosphosiderite
Gladstone-Dale:
CI meas= 0.035 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= 0.021 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2641,KPDmeas= 0.2603,KC= 0.2697 Ncalc = 1.73 - 1.74