General Information:
Chemical Formula:
(Ca,Na)(Si,Al)4O8
Composition:
(Molecular Weight = 271.81 gm)
Sodium 3.38 % Na
Calcium 8.85 % Ca
Aluminum 15.88 % Al
Silicon 24.80 % Si
Oxygen 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
More details...