Rossmanite Mineral Data

General Rossmanite Information

Chemical Formula:

[ ]LiAl2Al6(Si6O18)(BO3)3(OH)4

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

Empirical Formula:

LiAl₈Si₆O₁₈(BO₃)₃(OH)₄

Environment:

Granitic pegmatite hosted by biotite and hornblende gneiss.

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

Found in the Hradisko quarry, in the Rozn� lepidolite subtype of granitic pegmatite, northeastern part of the Str�zek Moldanubicum, Czech Republic. Link to MinDat.org Location Data.

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.

Name Pronunciation:

Rossmanite + Pronunciation

Synonym:

ICSD 85557

IMA1996-018

PDF (76-1951)

Rossmanite Image

Images:

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

Axial Ratios:

a:c = 1:0.44927

Cell Dimensions:

a = 15.77, c = 7.085, Z = 3; V = 1,525.93 Den(Calc)= 3.02

Crystal System:

Trigonal - Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.95(1), 2.552(0.93), 1.898(0.72),

Physical Properties of Rossmanite

Cleavage:

None

Color:

Pink, Pale pink.

Density:

Diaphaneity:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Columnar - Forms columns

Habit:

Crystalline - Coarse - Occurs as well-formed coarse sized crystals.

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Hardness:

7 - Quartz

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Rossmanite

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

Optical Data:

Uniaxial (-), e=1.624, w=1.645, bire=0.0210.

Calculated Properties of Rossmanite

Electron Density:

Bulk Density (Electron Density)=2.97 gm/cc
note: Specific Gravity of Rossmanite =3.00 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Rossmanite= 1.44 barns/electron
U=PE_Rossmanite x rElectron Density= 4.28 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Rossmanite is Not Radioactive

Rossmanite Classification

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

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

References:

NAME( AmMin) PHYS. PROP.(Am.Min.,Vol.83,p896-900,1998) OPTIC PROP.(AmMin)

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:

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