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 % V2 O3
Silicon 15.02 % Si 32.13 % SiO2
Boron 1.44 % B 4.65 % B2 O3
Hydrogen 0.03 % H 0.30 % H2 O
Chlorine 2.37 % Cl 2.37 % Cl
- %
Cl -0.53 % -O=Cl2
Oxygen 31.01 % O
______ ______
100.00 % 100.27 % = TOTAL OXIDE
Empirical Formula:
Ba4 V3+ 3 TiSi8 B2 O28.5 Cl(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 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
X Ray Diffraction:
By Intensity(I/Io ): 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:
PENagashimalite = 163.75 barns/electronU=PENagashimalite x r Electron 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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