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Reece J J , Redfern S A T , Welch M D , Henderson C M B , McCammon C A , Physics and Chemistry of Minerals , 29 (2002) p.562-570, Temperature-dependent Fe-Mn order-disorder behaviour in amphiboles, Sample: BM40798, T = 25 C, Locality: Langban, Sweden
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Hardness:
5-6 - Between Apatite and Orthoclase
Luster:
Vitreous - Silky
Streak:
white
Optical Properties of Manganogrunerite
Gladstone-Dale:
CI meas= 0.006 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.141 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1732,KPDmeas= 0.2004,KC= 0.2016 Ncalc = 1.63 - 1.76