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Taxer K , Bartl H , Crystal Research and Technology , 39 (2004) p.1080-1088, On the dimorphy between the variscite and clinovariscite group: refined, finestructural relationship of strengite and clinostrengite, Fe(PO4)*2H2O, Locality: Kreuzberg, Pleystein, Barvaria, Note: x(O3) corrected to match reported bond lengths
View Additional jPOWD Structure files for Strengite
[1]
Physical Properties of Strengite
Cleavage:
{010} Good, {001} Poor
Color:
Colorless, Pale violet, Deep violet, Red, Carmine red.
Botryoidal - "Grape-like" rounded forms (e.g.. malachite).
Habit:
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Habit:
Spherical - Spherical, rounded aggregates.
Hardness:
3.5 - Copper Penny
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Strengite
Gladstone-Dale:
CI meas= 0.048 (Good) - where the CI = (1-KPDmeas/KC) CI calc= 0.038 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2594,KPDmeas= 0.2567,KC= 0.2697 Ncalc = 1.77