Nagashimalite Mineral Data

Nagashimalite Mineral Data +

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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,

Synonym:

ICSD 201047

PDF 33-188

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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 - DipyramidalH-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

Diaphaniety:

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

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:

r_electron=3.74 gm/cc
note: r_{Nagashimalite}=4.08 gm/cc.

Fermion Index

Fermion Index = 0.07985
Boson Index = 0.92015

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Nagashimalite is Not Radioactive

Nagashimalite Classification

Dana Class:

64.3.1.3 (64)Cyclosilicate Rings with Other Anions and Insular Silicate Groups

(64.3)4-membered rings with [Si2O7] dimers

(64.3.1)Taramellite group

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

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

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

Strunz Class:

VIII/E.08-40 VIII - Silicates

VIII/E - Cyklosilicates, quadruplet rings [Si4O11]8-

VIII/E.08 - Joaquinite group, Baotite - Orthojoaquinite-(Ce) series

VIII/E.08-05 Verplanckite Ba2(Mn,Ti,Fe)2Si2O6(O,OH,Cl,F)2·3(H2O) P 6/mmm 6/m 2/m 2/m

VIII/E.08-10 Baotite Ba4(Ti,Nb)8Si4O28Cl I 4₁/a 4/m

VIII/E.08-15 Cerchiaraite! Ba4(Mn,Fe,Al)4Si6(O,OH,Cl)26 I 4/mmm 4/m 2/m 2/m

VIII/E.08-20 Titantaramellite Ba4(Ti,Fe,Fe,Mg)4(B2Si8O27)O2ClxX=0TO1,withTi>Fe Pmmn 2/m 2/m 2/m

VIII/E.08-30 Taramellite Ba4(Fe,Ti,Fe,Mg)4(B2Si8O27)O2Clx(x=0to1) Pmmn 2/m 2/m 2/m

VIII/E.08-40 Nagashimalite Ba4(V,Ti)4Si8B2O27Cl(O,OH)2 Pmmn 2/m 2/m 2/m

VIII/E.08-50 Strontiojoaquinite (Na,Fe)2Ba2Sr2Ti2[Si4O12]2(O,OH)2·(H2O) C 2 2

VIII/E.08-60 Strontio-orthojoaquinite (Na,Fe)2Ba2Sr2Ti2[Si4O12]2(O,OH)2·(H2O) Pbcm or Pbc2 Ortho

VIII/E.08-70 Bario-orthojoaquinite Fe2(Ba,Sr)4Ti2[Si4O12]O2·(H2O) Ccmm or Ccm2 Ortho

VIII/E.08-80 Joaquinite-(Ce) NaFeBa2Ce2(Ti,Nb)2[Si4O12]2O2(OH,F)·(H2O) C 2 2

VIII/E.08-89 Orthojoaquinite-(La)! Ba2Na(La,Ce)2FeTi2Si8O26(OH,O,F)·H2O Ccmm 2/m 2/m 2/m

VIII/E.08-90 Orthojoaquinite-(Ce) NaFeBa2Ce2Ti2[Si4O12]2O2(OH)·(H2O) Ccmm or Ccm21 Ortho

Other Nagashimalite Information

References:

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

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Nagashimalite

Ba4(V+++,Ti)4Si8B2O27Cl(O,OH)2
Dana No: 64.3.1.3 Strunz No: VIII/E.08-40
Locality:

Notes: