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Staurolite Mineral Data

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General Staurolite Information

Help on Chemical  Formula: Chemical Formula: (Fe++,Mg)2Al9(Si,Al)4O20(O,OH)4
Help on Composition: Composition: Molecular Weight = 811.89 gm
   Lithium     0.09 %  Li    0.18 % Li2O
   Magnesium   0.30 %  Mg    0.50 % MgO
   Aluminum   28.91 %  Al   54.63 % Al2O3
   Iron        9.63 %  Fe   12.39 % FeO
   Silicon    13.49 %  Si   28.86 % SiO2
   Hydrogen    0.29 %  H     2.55 % H2O
   Oxygen     47.30 %  O
             ______        ______ 
             100.00 %       99.11 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+1.4Li0.1Mg0.1Al8.6Si3.9Al0.1O21.7(OH)2.3
Help on Environment: Environment: Metamorphosed aluminous sedimentary rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1792
Help on Locality: Locality: Common world wide occurrences. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek, stauros - "cross" and lithos - "stone" in allusion to the common cross shaped twins of the crystals.
Help on Name Pronunciation: Name Pronunciation: Staurolite + Pronunciation Say STAUROLITE
Help on Synonym: Synonym: ICSD 67446
  PDF 41-1484

Staurolite Image

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Comments: Cruciform twinned staurolite crystals without matrix.
Location: Marble, Cherokee Co., North Carolina, USA. Scale: 3x2.5x1.5 cm.
© John Betts - Fine Minerals

Staurolite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4741:1:0.3405
Help on Cell Dimensions: Cell Dimensions: a = 7.88, b = 16.62, c = 5.66, Z = 2; beta = 90° V = 741.27 Den(Calc)= 3.64
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.693(1), 3.012(1), 2.372(0.8),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

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)

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Physical Properties of Staurolite

Help on Cleavage: Cleavage: {010} Distinct
Help on Color: Color: Brownish yellow, Brownish black, Yellow brown, Dark brown, Reddish brown.
Help on Density: Density: 3.65 - 3.77, Average = 3.71
Help on Diaphaneity: Diaphaneity: Translucent to opaque
Help on Fracture: Fracture: Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Habit: Habit: Twinning Common - Crystals are usually twinned.
Help on Hardness: Hardness: 7-7.5 - Quartz-Garnet
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Dull
Help on Streak: Streak: gray

Optical Properties of Staurolite

Help on Gladstone-Dale: 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
Help on Optical Data: 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.
Help on Pleochroism (x): Pleochroism (x): colorless, pale yellow, or yellowish red.
Help on Pleochroism (y): Pleochroism (y): colorless, pale yellow, or yellowish red.

Calculated Properties of Staurolite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.59 gm/cc
note: Specific Gravity of Staurolite =3.64 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0089329161
Boson Index = 0.9910670839
Help on Photoelectric: Photoelectric: PEStaurolite = 4.22 barns/electron
U=PEStaurolite x rElectron Density= 15.15 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Staurolite is Not Radioactive

Staurolite Classification

Help on  Dana Class: Dana Class: (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
  (52.02)with cations in [4] and >[4] coordination
  (52.02.03)Dana Group Staurolite (Fe,Mg)2Al9(Si,Al)4O20(O,OH)4 C 2/m 2/m Magnesiostaurolite! []4Mg4Al16(Al,[])2Si8O40[O6,(OH)2] C 2/m 2/m Zincostaurolite! []4Zn4Al16(Al,[])2Si8O40[O6,(OH)2] C 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.AF.30 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AF -Nesosilicates with additional anions;
09.AF.30 Staurolite (Fe,Mg)2Al9(Si,Al)4O20(O,OH)4 C 2/m 2/m
09.AF.30 Magnesiostaurolite! []4Mg4Al16(Al,[])2Si8O40[O6,(OH)2] C 2/m 2/m
09.AF.30 Zincostaurolite! []4Zn4Al16(Al,[])2Si8O40[O6,(OH)2] C 2/m 2/m

Other Staurolite Information

Help on See Also: See Also: Links to other databases for Staurolite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - CalTech Mineral Spectroscopy
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Glendale Community College
9 - Google Images
10 - Google Scholar
11 - Handbook of Mineralogy (MinSocAm)
12 - Handbook of Mineralogy (UofA)
13 - HyperPhysics
14 - MinDAT
15 - Mineralienatlas (Deutsch)
16 - Minerals in Thin Section-University of North Carolina
17 - Minerals in Thin Sections-Humboldt State
18 - Online Mineral Museum
19 - QUT Mineral Atlas
20 - Ruff.Info
21 - Scandinavian mineral gallery
22 - UCLA - Petrography Thin-Sections
24 - theimage

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Dana No: Strunz No: 09.AF.30





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