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Pekov I V , Chukanov N V , Ferraris G , Ivaldi G , Pushcharovsky D Y , Zadov A E , European Journal of Mineralogy , 15 (2003) p.447-454, Shirokshinite, K(NaMg2)Si4O10F2, a new mica with octahedral Na from Khidiny massif,, Kola Peninsula: descriptive data and structural disorder, Locality: Khidiny massif, Kola Peninsula, Russia
Physical Properties of Shirokshinite
Cleavage:
{001} Perfect
Color:
Colorless, Pale gray.
Diaphaneity:
Transparent to Translucent
Fracture:
Flexible - Flexible fragments.
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Habit:
Pseudo Hexagonal - Crystals show a hexagonal outline.
Habit:
Skeletal - Crystals form crude outlines with missing faces.
Hardness:
2.5 - Finger Nail
Luster:
Vitreous - Pearly
Streak:
white
Optical Properties of Shirokshinite
Gladstone-Dale:
CI calc= 0.055 (Good) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1863,KC= 0.1972 Ncalc = 1.58