Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu
Help on Above
Forms:
( 0 1 0) ( 2 0 1) ( 1 1 0) ( 0 0 1)
Warning: this java applet does not work in some browsers because of security restrictions.
Physical Properties of Staurolite
Cleavage:
{010} Distinct
Color:
Brownish yellow, Brownish black, Yellow brown, Dark brown, Reddish brown.
Density:
3.65 - 3.77, Average = 3.71
Diaphaneity:
Translucent to opaque
Fracture:
Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.
Habit:
Tabular - Form dimensions are thin in one direction.
Habit:
Twinning Common - Crystals are usually twinned.
Hardness:
7-7.5 - Quartz-Garnet
Luminescence:
Non-fluorescent.
Luster:
Vitreous - Dull
Streak:
gray
Optical Properties of Staurolite
Gladstone-Dale:
CI meas= 0.025 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= 0.006 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2053,KPDmeas= 0.2014,KC= 0.2066 Ncalc = 1.75 - 1.78
Optical Data:
Biaxial (+), a=1.736-1.747, b=1.74-1.754, g=1.745-1.762, bire=0.0090-0.0150, 2V(Calc)=84-88, 2V(Meas)=88. Dispersion weak to moderate, r > v.
Pleochroism (x):
colorless, pale yellow, or yellowish red.
Pleochroism (y):
colorless, pale yellow, or yellowish red.
Calculated Properties of Staurolite
Electron Density:
Bulk Density (Electron Density)=3.59 gm/cc note: Specific Gravity of Staurolite =3.64 gm/cc.
Fermion Index:
Fermion Index = 0.0089329161 Boson Index = 0.9910670839
Photoelectric:
PEStaurolite = 4.22 barns/electron U=PEStaurolite x rElectron Density= 15.15 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Staurolite is Not Radioactive
Staurolite Classification
Dana Class:
52.02.03.01(52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
Chemical Formula: 
