General Information: Chemical Formula:(Na,Ca)(Si,Al)4O8
Composition:(Molecular Weight = 268.62 gm)
Sodium 5.14 %
NaCalcium 5.97 %
CaAluminum 14.06 %
AlSilicon 27.18 %
SiOxygen 47.65 %
O Empirical Formula: Na0.6Ca0.4Al1.4Si2.6O8
Environment:Magmatic and metamorphic rocks.
IMA Status:Not IMA Approved
Locality:Andes Mountains, South America.
Name Origin:Named after its locality.
Physical Properties: Cleavage:[001] Perfect, [010] Good
Color:colorless, gray, yellow green, or white.
Density:2.66 - 2.68, Average = 2.67
Diaphaniety:Transparent to Subtransparent to translucent
Habits:Granular - Generally occurs as anhedral to subhedral crystals in matrix., Crystalline - Coarse - Occurs as well-formed coarse sized crystals., Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Hardness:7 - Quartz
Luminescence:Non-fluorescent.
Luster:Vitreous (Glassy)
Streak:white
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