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Dominant species
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Melilite
Chemical
Formula
(Ca,Na)2(Al,Mg,Fe2+)[(Al,Si)SiO7]
Species
Silicates
Crystal
System
Tetragonal
Mohs
Scale
5-5.5
Specific
Gravity
2.9-3.0
Color
Yellowish, greenish brown
Streak
white
Luster
Vitreous - greasy
Refractive
Index
nω = 1.632 - 1.669 nε = 1.626 - 1.658
Diaphaneity
Translucent
Cleavage
Distinct on , weak on
Fracture
Uneven
Crystal Habit:Massive - granular
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Melilite5208
Melilite5208