Staurolite Mineral Data (original) (raw)
General Staurolite Information
Chemical Formula:
(Fe++,Mg)2Al9(Si,Al)4O20(O,OH)4
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
Empirical Formula:
Fe2+1.4Li0.1Mg0.1Al8.6Si3.9Al0.1O21.7(OH)2.3
Environment:
Metamorphosed aluminous sedimentary rocks.
IMA Status:
Valid Species (Pre-IMA) 1792
Locality:
Common world wide occurrences. Link to MinDat.org Location Data.
Name Origin:
From the Greek, stauros - "cross" and lithos - "stone" in allusion to the common cross shaped twins of the crystals.
Name Pronunciation:
Staurolite + Pronunciation 
Synonym:
ICSD 67446
PDF 41-1484
Staurotide
Staurolite Image
Images:
Staurolite Crystallography
Axial Ratios:
a:b:c =0.4741:1:0.3405
Cell Dimensions:
a = 7.88, b = 16.62, c = 5.66, Z = 2; beta = 90° V = 741.27 Den(Calc)= 3.64
Crystal System:
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m
X Ray Diffraction:
By Intensity(I/Io): 2.693(1), 3.012(1), 2.372(0.8),
Forms:
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| | Forms:( 0 1 0) ( 2 0 1) ( 1 1 0) ( 0 0 1) Warning: this large pop-up is very compute intensive and may not work well with some computers. | | ---------------------------------------------------------------------------------------------------------------------------------------------------------------- |
Crystal Structure:
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| | Smith J V , American Mineralogist , 53 (1968) p.1139-1155, The crystal structure of staurolite View Additional jPOWD Structure files for Staurolite [1] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [2] [20] [21] [22] [23] [24] [3] [4] [5] [6] [7] [8] [9] | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
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
(52.02)with cations in [4] and >[4] coordination
(52.02.03)Dana Group
52.02.03.01 Staurolite (Fe,Mg)2Al9(Si,Al)4O20(O,OH)4 C 2/m 2/m
52.02.03.02 Magnesiostaurolite! []4Mg4Al16(Al,[])2Si8O40[O6,(OH)2] C 2/m 2/m
52.02.03.03 Zincostaurolite! []4Zn4Al16(Al,[])2Si8O40[O6,(OH)2] C 2/m 2/m
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
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
23 - WWW-MINCRYST
24 - theimage
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Ask about Staurolite here :
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Print or Cut-and-Paste your Staurolite Specimen Label here :
Staurolite
(Fe++,Mg)2Al9(Si,Al)4O20(O,OH)4
Dana No: 52.02.03.01 Strunz No: 09.AF.30
Locality:
Notes: