General Information:
Chemical Formula:(Ca,Na)(Si,Al)4O8
Composition:(Molecular Weight = 271.81 gm)Sodium 3.38 %
NaCalcium 8.85 %
CaAluminum 15.88 %
AlSilicon 24.80 %
SiOxygen 47.09 %
O Empirical Formula: Na0.4Ca0.6Al1.6Si2.4O8
Environment:Magmatic and metamorphic rocks.
IMA Status:Not IMA Approved
Locality:Labrador peninsula, Canada.
Name Origin:Named after its locality.
Physical Properties: Cleavage:[001] Perfect, [010] Good, [110] Distinct
Color:colorless, gray, gray white, white, or light green.
Density:2.68 - 2.71, Average = 2.69
Diaphaniety:Translucent to transparent
Habits:Granular - Generally occurs as anhedral to subhedral crystals in matrix., Crystalline - Coarse - Occurs as well-formed coarse sized crystals., Striated - Parallel lines on crystal sur face or cleavage face.
Hardness:7 - Quartz
Luminescence:Non-fluorescent.
Luster:Vitreous (Glassy)
Streak:white
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