Nagashimalite Mineral Data

General Nagashimalite Information

Chemical Formula:

Ba4(V+++,Ti)4Si8B2O27Cl(O,OH)2

Composition:

Molecular Weight = 1,496.26 gm

Barium 36.71 % Ba 40.99 % BaO

Titanium 3.20 % Ti 5.34 % TiO₂

Vanadium 10.21 % V 15.03 % V₂O₃

Silicon 15.02 % Si 32.13 % SiO₂

Boron 1.44 % B 4.65 % B₂O₃

Hydrogen 0.03 % H 0.30 % H₂O

Chlorine 2.37 % Cl 2.37 % Cl

- % Cl -0.53 % -O=Cl₂

Oxygen 31.01 % O

______ ______

100.00 % 100.27 % = TOTAL OXIDE

Empirical Formula:

Ba₄V³⁺₃TiSi₈B₂O_28.5Cl(OH)_0.5

Environment:

In fissures cutting massive rhodonite ore in a bedded manganese deposit.

IMA Status:

Approved IMA 1980

Locality:

Mogurazawa mine, Honshu, Kiryu, Gumma Prefecture, Japan. Link to MinDat.org Location Data.

Name Origin:

Named for Otokichi Nagashima (1890{1969), pioneer Japanese amateur mineralogist,

Name Pronunciation:

Nagashimalite + Pronunciation

Synonym:

ICSD 201047

PDF 33-188

Nagashimalite Image

Images:

Nagashimalite

Comments: SEM image of a prismatic, striated nagashimalite crystal.
Location: Mogurazawa mine, Honshu, Kiryu, Gumma Prefecture, Japan. Scale: Scale Bar 0.05 mm.
© Mineralogical Journal

Images:

Nagashimalite

Comments: Dark olive green translucent to opaque bladed nagashimalite crystals on in pale pink rhodonite.
Location: Mogurazawa mine, Kiryuu City, Gunma Prefecture, Kanto Region, Honshu Island, Japan. Scale: Picture Size 3 mm.
© Jeff Weissman / Photographic Guide to Mineral Species

Nagashimalite Crystallography

Axial Ratios:

a:b:c =1.1497:1:0.587

Cell Dimensions:

a = 13.937, b = 12.122, c = 7.116, Z = 2; V = 1,202.21 Den(Calc)= 4.13

Crystal System:

Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pmmn

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

By Intensity(I/I_o): 3.02(1), 3.03(0.6), 2.592(0.28),

Physical Properties of Nagashimalite

Cleavage:

None

Color:

Greenish black.

Density:

4.08

Diaphaneity:

Opaque to translucent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Hardness:

6 - Orthoclase

Luster:

Sub Metallic

Streak:

green

Optical Properties of Nagashimalite

Gladstone-Dale:

CI meas= 0.071 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.082 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1843,KPDmeas= 0.1865,KC= 0.2007
Ncalc = 1.82 - 1.83

Optical Data:

Biaxial (+), a=1.75, b=1.753, g=1.78, bire=0.0300, 2V(Calc)=38, 2V(Meas)=30.

Pleochroism (x):

greenish yellow.

Pleochroism (y):

green.

Pleochroism (z):

greenish brown.

Calculated Properties of Nagashimalite

Electron Density:

Bulk Density (Electron Density)=3.74 gm/cc
note: Specific Gravity of Nagashimalite =4.08 gm/cc.

Fermion Index:

Fermion Index = 0.07
Boson Index = 0.93

Photoelectric:

PE_{Nagashimalite}= 163.75 barns/electron
U=PE_{Nagashimalite} x rElectron Density= 613.06 barns/cc.

Radioactivity:

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

Nagashimalite Classification

Dana Class:

64.03.01.03 (64)Cyclosilicates

(64.03)4-membered rings with [Si2O7] dimers

(64.03.01)Taramellite group

64.03.01.01 Taramellite Ba4(Fe,Ti,Fe,Mg)4(B2Si8O27)O2Clx(x=0to1) Pmmn 2/m 2/m 2/m

64.03.01.02 Titantaramellite Ba4(Ti,Fe,Fe,Mg)4(B2Si8O27)O2ClxX=0TO1,withTi>Fe Pmmn 2/m 2/m 2/m

64.03.01.03 Nagashimalite Ba4(V,Ti)4Si8B2O27Cl(O,OH)2 Pmmn 2/m 2/m 2/m

Strunz Class:

09.CE.20 09 - SILICATES (Germanates)

09.C - Cyclosilicates

09.CE -[Si4O12]8- 4-membered single rings (vierer-Einfachringe),

09.CE.20 Nagashimalite Ba4(V,Ti)4Si8B2O27Cl(O,OH)2 Pmmn 2/m 2/m 2/m

09.CE.20 Titantaramellite Ba4(Ti,Fe,Fe,Mg)4(B2Si8O27)O2ClxX=0TO1,withTi>Fe Pmmn 2/m 2/m 2/m

09.CE.20 Taramellite Ba4(Fe,Ti,Fe,Mg)4(B2Si8O27)O2Clx(x=0to1) Pmmn 2/m 2/m 2/m

Other Nagashimalite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Nagashimalite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Nagashimalite

Ba4(V+++,Ti)4Si8B2O27Cl(O,OH)2
Dana No: 64.03.01.03 Strunz No: 09.CE.20
Locality:

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