Rossmanite Mineral Data

Rossmanite Mineral Data
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General Rossmanite Information

Help on Chemical Formula: Chemical Formula: [ ]LiAl2Al6(Si6O18)(BO3)3(OH)4
Help on Composition: Composition: Molecular Weight = 923.75 gm
   Lithium    0.75 %  Li    1.62 % Li2O
   Aluminum  23.37 %  Al   44.15 % Al2O3
   Silicon   18.24 %  Si   39.03 % SiO2
   Boron      3.51 %  B    11.30 % B2O3
   Hydrogen   0.44 %  H     3.90 % H2O
   Oxygen    53.69 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: LiAl8Si6O18(BO3)3(OH)4
Help on Environment: Environment: Granitic pegmatite hosted by biotite and hornblende gneiss.
Help on IMA Status: IMA Status: Approved IMA 1998 (Dana # Added)
Help on Locality: Locality: Found in the Hradisko quarry, in the Rozná lepidolite subtype of granitic pegmatite, northeastern part of the Strázek Moldanubicum, Czech Republic. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after George R. Rossman (1945-), California Institute of Technology, Pasadena, CA, USA, in recognition for his work on the spectroscopy of the tourmaline minerals.
Help on Name Pronunciation: Name Pronunciation: Rossmanite + Pronunciation Say ROSSMANITE
Help on Synonym: Synonym: ICSD 85557
  IMA1996-018
  PDF (76-1951)
 

Rossmanite Image

Click Here for Larger Rossmanite Image in a New Browser Window Images:
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Rossmanite

Comments: Pale pink to tan translucent prismatic rossmanite crystals.
Location: Near Rozna, Western Moravia, Jihomoravsky, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Rossmanite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:0.44927
Help on Cell Dimensions: Cell Dimensions: a = 15.77, c = 7.085, Z = 3; V = 1,525.93 Den(Calc)= 3.02
Help on Crystal System: Crystal System: Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: R 3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.95(1), 2.552(0.93), 1.898(0.72),
Click Here for Large Rossmanite Structure Window Crystal Structure:

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Selway J B , Novak M , Hawthorne F C , Cerny P , Ottolini L , Kyser T K , American Mineralogist , 83 (1998) p.896-900

View Additional jPOWD Structure files for Rossmanite
[1] [2]
 

Physical Properties of Rossmanite

Help on Cleavage: Cleavage: None
Help on Color: Color: Pink, Pale pink.
Help on Density: Density: 3
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Columnar - Forms columns
Help on Habit: Habit: Crystalline - Coarse - Occurs as well-formed coarse sized crystals.
Help on Habit: Habit: Striated - Parallel lines on crystal surface or cleavage face.
Help on Hardness: Hardness: 7 - Quartz
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Rossmanite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.017 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.023 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2101,KPDmeas= 0.2115,KC= 0.2151
Ncalc = 1.65
Help on Optical Data: Optical Data: Uniaxial (-), e=1.624, w=1.645, bire=0.0210.
 

Calculated Properties of Rossmanite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.97 gm/cc
note: Specific Gravity of Rossmanite =3.00 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PERossmanite = 1.44 barns/electron
U=PERossmanite x rElectron Density= 4.28 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Rossmanite is Not Radioactive
 

Rossmanite Classification
Help on Dana Class: Dana Class: 61.03a.01.03 (61)Cyclosilicate Six-Membered Rings
  (61.03a)with borate groups (Alkali-Deficient Tourmaline Subgroup)
  (61.03a.01)Foitite Subgroup
 
61.03a.01.01 Foitite! []Na<0.5(Fe,Al)3Al6Si6O18(BO3)3(OH)4 R 3m 3m
 
61.03a.01.02 Magnesiofoitite! [](Mg2Al)Al6(Si6O18)(BO3)3(OH)4 R 3m 3m
 
61.03a.01.03 Rossmanite! []LiAl2Al6(Si6O18)(BO3)3(OH)4 R 3m 3m
Help on Strunz Class: Strunz Class: 09.CK.05 09 - SILICATES (Germanates)
  09.C - Cyclosilicates
  09.CK -[Si6O18]12- 6-membered single rings, with insular complex anions
 
09.CK.05 Chromdravite! NaMg3(Cr,Fe)6(BO3)3Si6O18(OH)4 R 3m 3m
 
09.CK.05 Feruvite! (Ca,Na)(Fe,Mg,Ti)3(Al,Mg,Fe)6(BO3)3Si6O18(OH)4 R 3m 3m
 
09.CK.05 Dravite NaMg3Al6(BO3)3Si6O18(OH)4 R 3m 3m
 
09.CK.05 Buergerite! NaFe3Al6(BO3)3Si6O21F R 3m 3m
 
09.CK.05 Foitite! []Na<0.5(Fe,Al)3Al6Si6O18(BO3)3(OH)4 R 3m 3m
 
09.CK.05 Liddicoatite! Ca(Li,Al)3Al6(BO3)3Si6O18(O,OH,F)4 R 3m 3m
 
09.CK.05 Elbaite Na(Li,Al)3Al6(BO3)3Si6O18(OH)4 R 3m 3m
 
09.CK.05 Rossmanite! []LiAl2Al6(Si6O18)(BO3)3(OH)4 R 3m 3m
 
09.CK.05 Olenite! NaAl3Al6(BO3)3(Si6O18)(O,OH)4 R 3m 3m
 
09.CK.05 Povondraite! (Na,K)(Fe,Fe)3(Fe,Mg,Al)6(BO3)3Si6O18(OH)4 R 3m 3m
 
09.CK.05 Schorl NaFe3Al6(BO3)3Si6O18(OH)4 R 3m 3m
 
09.CK.05 Uvite (Ca,Na)(Mg,Fe)3Al5Mg(BO3)3Si6O18(OH,F)4 R 3m 3m
 
09.CK.05 Vanadiumdravite! NaMg3V6(Si6O18)(BO3)3(OH)4 R 3m 3m
 
09.CK.05 Magnesiofoitite! [](Mg2Al)Al6(Si6O18)(BO3)3(OH)4 R 3m 3m
 
09.CK.05 Hydroxyuvite! CaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH) R 3m 3m
 
09.CK.05 Schorl-(F)! NaFe3Al6Si6O18)(BO3)3(OH)3(F,OH) R 3m 3m
 

Other Rossmanite Information
Help on References: References: NAME( AmMin) PHYS. PROP.(Am.Min.,Vol.83,p896-900,1998) OPTIC PROP.(AmMin)
Help on See Also: See Also: Links to other databases for Rossmanite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - CalTech Mineral Spectroscopy
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info
12 - WWW-MINCRYST

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Rossmanite

[ ]LiAl2Al6(Si6O18)(BO3)3(OH)4
Dana No: 61.03a.01.03 Strunz No: 09.CK.05
Locality:

 

Notes: