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Krivovichev S V , Armbruster T , Organova N I , Burns P C , Seredkin M V , Chukanov N V , American Mineralogist , 89 (2004) p.1138-1141, Incorporation of sodium into the chlorite structure: the crystal structure, of glagolevite, Na(Mg,Al)6[Si3AlO10](OH,O)8
Physical Properties of Glagolevite
Cleavage:
{001} Perfect
Color:
Colorless.
Density:
2.66
Diaphaneity:
Transparent
Fracture:
Flexible - Flexible fragments.
Habit:
Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Hardness:
3-4 - Calcite-Fluorite
Luster:
Vitreous - Pearly
Streak:
white
Optical Properties of Glagolevite
Gladstone-Dale:
CI meas= 0.041 (Good) - where the CI = (1-KPDmeas/KC) CI calc= 0.065 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2087,KPDmeas= 0.2142,KC= 0.2233 Ncalc = 1.59 - 1.61