Rossmanite Mineral Data

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 Rozná lepidolite subtype of granitic pegmatite, northeastern part of the Strázek 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.

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 PyramidalH-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),

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

Cleavage:

None

Color:

Pink, Pale pink.

Density:

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Rossmanite

Electron Density:

r_electron=2.97 gm/cc
note: r_Rossmanite=3.00 gm/cc.

Fermion Index

Fermion Index = 0.01632
Boson Index = 0.98368

Photoelectric:

PE_Rossmanite= 1.44 barns/electron
U=PE_Rossmanite x r_electron= 4.28 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Rossmanite is Not Radioactive

Rossmanite Classification

Dana Class:

61.3a.1.3 (61)Cyclosilicate Six-Membered Rings

(61.3a)with borate groups (Alkali-Deficient Tourmaline Subgroup)

(61.3a.1)Dana Group

61.3a.1.1 Foitite! []Na<0.5(Fe,Al)3Al6Si6O18(BO3)3(OH)4 R 3m 3m

61.3a.1.2 Magnesiofoitite! [](Mg2Al)Al6(Si6O18)(BO3)3(OH)4 R 3m 3m

61.3a.1.3 Rossmanite ! []LiAl2Al6(Si6O18)(BO3)3(OH)4 R 3m 3m

Strunz Class:

VIII/E.19-05 VIII - Silicates

VIII/E - Cyklosilicates, six rings [Si6O18]12-

VIII/E.19 - Tourmaline group

VIII/E.19-05 Rossmanite []LiAl2Al6(Si6O18)(BO3)3(OH)4 R 3m 3m

VIII/E.19-10 Elbaite Na(Li,Al)3Al6(BO3)3Si6O18(OH)4 R 3m 3m

VIII/E.19-15 Magnesiofoitite! [](Mg2Al)Al6(Si6O18)(BO3)3(OH)4 R 3m 3m

VIII/E.19-20 Dravite NaMg3Al6(BO3)3Si6O18(OH)4 R 3m 3m

VIII/E.19-30 Chromdravite! NaMg3(Cr,Fe)6(BO3)3Si6O18(OH)4 R 3m 3m

VIII/E.19-35 Vanadiumdravite! NaMg3V6(Si6O18)(BO3)3(OH)4 R 3m 3m

VIII/E.19-50 Schorl NaFe3Al6(BO3)3Si6O18(OH)4 R 3m 3m

VIII/E.19-55 Foitite! []Na<0.5(Fe,Al)3Al6Si6O18(BO3)3(OH)4 R 3m 3m

VIII/E.19-60 Olenite! NaAl3Al6(BO3)3(Si6O18)(O,OH)4 R 3m 3m

VIII/E.19-70 Buergerite! NaFe3Al6(BO3)3Si6O21F R 3m 3m

VIII/E.19-75 Povondraite! (Na,K)(Fe,Fe)3(Fe,Mg,Al)6(BO3)3Si6O18(OH)4 R 3m 3m

VIII/E.19-80 Liddicoatite! Ca(Li,Al)3Al6(BO3)3Si6O18(O,OH,F)4 R 3m 3m

VIII/E.19-90 Uvite (Ca,Na)(Mg,Fe)3Al5Mg(BO3)3Si6O18(OH,F)4 R 3m 3m

VIII/E.19-100 Feruvite! (Ca,Na)(Fe,Mg,Ti)3(Al,Mg,Fe)6(BO3)3Si6O18(OH)4 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 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 - WWW-MINCRYST

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Rossmanite

[ ]LiAl2Al6(Si6O18)(BO3)3(OH)4
Dana No: 61.3a.1.3 Strunz No: VIII/E.19-05
Locality:

Notes: