General Spessartine Information
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Chemical Formula: |
Mn++3Al2(SiO4)3 |
Composition: |
Molecular Weight = 495.03 gm |
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Manganese 33.29 % Mn 42.99 % MnO |
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Aluminum 10.90 % Al 20.60 % Al2O3 |
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Silicon 17.02 % Si 36.41 % SiO2 |
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Oxygen 38.78 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
Mn2+3Al2(SiO4)3 |
Environment: |
Magmatic, metamorphic, and pegmatitic rocks. |
IMA Status: |
Valid Species (Pre-IMA) 1832 |
Locality: |
Aschaffenburg, Spessart Mountains, Bavaria, Germany Link to MinDat.org Location Data. |
Name Origin: |
Named after its locality. |
Synonym: |
Spessartite |
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Spessartine Image |
Images:
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Spessartine Crystallography
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Cell Dimensions: |
a = 11.621, Z = 8; V = 1,569.39 Den(Calc)= 4.19 |
Crystal System: |
Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: I a3d |
X Ray Diffraction: |
By Intensity(I/Io): 2.6(1), 1.56(0.4), 1.61(0.3), |
Forms:
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Forms:
[ 2 1 1]
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Crystal Structure:
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Novak G A , Gibbs G V , American Mineralogist , 56 (1971) p.791-825, The crystal chemistry of the silicate garnets, sample Sp
View Additional jPOWD Structure files for Spessartine
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Physical Properties of Spessartine
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Cleavage: |
[???] Distinct |
Color: |
Red, Reddish orange, Yellowish brown, Reddish brown, Brown. |
Density: |
4.18 |
Diaphaniety: |
Transparent to translucent |
Fracture: |
Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces. |
Habit: |
Crystalline - Fine - Occurs as well-formed fine sized crystals. |
Habit: |
Lamellar - Thin laminae producing a lamellar structure. |
Habit: |
Massive - Uniformly indistinguishable crystals forming large masses. |
Hardness: |
6.5-7.5 |
Luminescence: |
Non-fluorescent. |
Luster: |
Vitreous - Resinous |
Magnetism: |
Nonmagnetic |
Streak: |
white |
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Optical Properties of Spessartine
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Gladstone-Dale: |
CI meas= 0.058 (Good) - where the CI = (1-KPDmeas/KC) CI calc= 0.06 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1909,KPDmeas= 0.1914,KC= 0.2031 |
Optical Data: |
Isotropic, n=1.8. |
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Calculated Properties of Spessartine
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Electron Density: |
relectron=4.04 gm/cc note: rSpessartine =4.18 gm/cc. |
Fermion Index |
Fermion Index = 0.00813 Boson Index = 0.99187 |
Photoelectric: |
PESpessartine = 9.50 barns/electron U=PESpessartine x relectron= 38.35 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Spessartine is Not Radioactive |
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Spessartine Classification
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Dana Class: |
51.4.3a.3 (51)Nesosilicate Insular SiO4 Groups Only |
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(51.4)with cations in [6] and >[6] coordination |
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(51.4.3a)Garnet group (Pyralspite series) |
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51.4.3a.1 Pyrope Mg3Al2(SiO4)3 I a3d 4/m 3 2/m |
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51.4.3a.2 Almandine Fe3Al2(SiO4)3 I a3d 4/m 3 2/m |
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51.4.3a.3 Spessartine Mn3Al2(SiO4)3 I a3d 4/m 3 2/m |
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51.4.3a.4 Knorringite Mg3Cr2(SiO4)3 I a3d 4/m 3 2/m |
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51.4.3a.5 Majorite Mg3(Fe,Al,Si)2(SiO4)3 I a3d 4/m 3 2/m |
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51.4.3a.6 Calderite (Mn,Ca)3(Fe,Al)2(SiO4)3 I a3d 4/m 3 2/m |
Strunz Class: |
VIII/A.08-30 VIII - Silicates |
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VIII/A - Nesosilicates with [SiO4]4-groups, cations of octahedral and cubic orientation [8+6] |
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VIII/A.08 - Garnet group, Pyrope - Henritermierite |
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VIII/A.08-10 Pyrope Mg3Al2(SiO4)3 I a3d 4/m 3 2/m |
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VIII/A.08-20 Almandine Fe3Al2(SiO4)3 I a3d 4/m 3 2/m |
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VIII/A.08-30 Spessartine Mn3Al2(SiO4)3 I a3d 4/m 3 2/m |
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VIII/A.08-40 Calderite (Mn,Ca)3(Fe,Al)2(SiO4)3 I a3d 4/m 3 2/m |
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VIII/A.08-50 Knorringite Mg3Cr2(SiO4)3 I a3d 4/m 3 2/m |
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VIII/A.08-60 Majorite Mg3(Fe,Al,Si)2(SiO4)3 I a3d 4/m 3 2/m |
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VIII/A.08-70 Grossular Ca3Al2(SiO4)3 I a3d 4/m 3 2/m |
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VIII/A.08-80 Hibschite Ca3Al2(SiO4)3-x(OH)4x(x=0.2-1.5) I a3d 4/m 3 2/m |
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VIII/A.08-90 Katoite Ca3Al2(SiO4)3-x(OH)4xx=1.5-3 I a3d 4/m 3 2/m |
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VIII/A.08-100 Hydrougrandite? (Ca,Mg,Fe)3(Fe,Al)2(SiO4)3-x(OH)4x I a3d 4/m 3 2/m |
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VIII/A.08-110 Andradite Ca3Fe2(SiO4)3 I a3d 4/m 3 2/m |
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VIII/A.08-120 Schorlomite Ca3(Ti,Fe,Al)2[(Si,Fe,Fe)O4]3 I a3d 4/m 3 2/m |
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VIII/A.08-125 Morimotoite Ca3TiFeSi3O12 I a3d 4/m 3 2/m |
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VIII/A.08-130 Uvarovite Ca3Cr2(SiO4)3 I a3d 4/m 3 2/m |
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VIII/A.08-138 Yamatoite! (Mn,Ca)3(V,Al)2(SiO4)3 I a3d 4/m 3 2/m |
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VIII/A.08-140 Goldmanite Ca3(V,Al,Fe)2(SiO4)3 I a3d 4/m 3 2/m |
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VIII/A.08-150 Kimzeyite Ca3(Zr,Ti)2(Si,Al,Fe)3O12 I a3d 4/m 3 2/m |
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VIII/A.08-160 Henritermierite Ca3(Mn,Al)2(SiO4)2(OH)4 I 41/acd 4/m 2/m 2/m |
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Other Spessartine Information
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References: |
NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
See Also: |
Links to other databases for Spessartine :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 -Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Applied Mineralogy
6 -Athena
7 - Crocoite.com Mineral Locations
8 - EUROmin Project
9 - Franklin Minerals(Dunn)
10 -Google Images
11 -Google Scholar
12 -Handbook of Mineralogy (MinSocAm)
13 -Handbook of Mineralogy (UofA)
14 - HyperPhysics
15 -MinDAT
16 -MinMax(Deutsch)
17 -MinMax(English)
18 - Mineral and Gemstone Kingdom
19 -Mineral of the Month
20 -Mineralienatlas (Deutsch)
21 - Minerals of Wisconsin
22 -QUT Mineral Atlas
23 - Scandinavian mineral gallery
24 - UCLA - Petrography Thin-Sections
25 -University of Colorado - Mineral Structure Data
26 -University of Texas at Austin
27 - WWW-MINCRYST
28 -École des Mines de Paris
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Spessartine
Mn++3Al2(SiO4)3
Dana No: 51.4.3a.3 Strunz No: VIII/A.08-30
Locality:
Notes:
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