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Dominant species
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Dumortierite
Chemical
Formula
Al7BO3(SiO4)3O3 or Al6.5-7BO3(SiO4)3(O,OH)3[1]
Species
Silicates
Crystal
System
Orthorhombic
Mohs
Scale
7
Specific
Gravity
3.3-3.4
Color
Blue, greenish-blue, Purple-blue, pale blue, red
Streak
White
Luster
Vitreous
Refractive
Index
n = 1.659 - 1.678 n = 1.684 - 1.691 n = 1.686 - 1.692
Diaphaneity
Transparent to translucent
Cleavage
Distinct on , poor on ; parting on
Fracture
Fibrous
Crystal Habit:As fibrous or columnar crystals; coarsely crystalline to intimate parallel aggregates of needles; massive
Dumortierite7566
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Dumortierite7562
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Dumortierite7561
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Dumortierite7560
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