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Ghose S , Sen Gupta P K , Campana C F , American Mineralogist , 72 (1987) p.365-374, Symmetry and crystal structure of monteregianite, Na4K2Y2Si16O38.10H2O, a, double-sheet silicate with zeolitic properties, Note: Several bond lengths cannot be reproduced with this data, but the authors, no longer have the original data, so they cannot check
Physical Properties of Monteregianite-(Y)
Cleavage:
{010} Perfect, {001} Good, {100} Distinct
Color:
Colorless, Greenish, Gray, Gray white, White.
Density:
2.42
Diaphaneity:
Transparent to Translucent
Habit:
Acicular - Occurs as needle-like crystals.
Habit:
Pseudo Orthorhombic - Crystals show an orthorhombic shape.
Habit:
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Hardness:
3.5 - Copper Penny
Luminescence:
Fluorescent, Short UV=green.
Luster:
Vitreous - Silky
Streak:
white
Optical Properties of Monteregianite-(Y)
Gladstone-Dale:
CI meas= 0.018 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.005 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2148,KPDmeas= 0.2121,KC= 0.216 Ncalc = 1.52