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Physical Properties of Dumortierite
Cleavage:
{100} Good, {110} Indistinct
Color:
Blue, Brown, Violet, Greenish blue, Pink.
Density:
3.3 - 3.4, Average = 3.34
Diaphaneity:
Transparent to translucent
Fracture:
Fibrous - Thin, elongated fractures produced by crystal forms or intersecting cleavages (e.g. asbestos).
Habit:
Columnar - Forms columns
Habit:
Fibrous - Crystals made up of fibers.
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Hardness:
8.5 - Chrysoberyl
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Magnetism:
Nonmagnetic
Streak:
white
Optical Properties of Dumortierite
Gladstone-Dale:
CI meas= 0.028 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= 0.037 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2017,KPDmeas= 0.2035,KC= 0.2094 Ncalc = 1.69 - 1.71
Optical Data:
Biaxial (-), a=1.659-1.678, b=1.684-1.691, g=1.686-1.692, bire=0.0140-0.0270, 2V(Calc)=30, 2V(Meas)=20-52. Dispersion r > v or r < v.
Pleochroism (x):
blue, violet, greenish blue, or deep rose.
Pleochroism (y):
colorless, reddish violet, pale lilac blue, or yellow.
Calculated Properties of Dumortierite
Electron Density:
Bulk Density (Electron Density)=3.31 gm/cc note: Specific Gravity of Dumortierite =3.35 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PEDumortierite = 1.55 barns/electron U=PEDumortierite x rElectron Density= 5.11 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Dumortierite is Not Radioactive
Dumortierite Classification
Dana Class:
54.01.02.01(54)Nesosilicate Borosilicates and Some Beryllosilicates
Chemical Formula: 
