Yamatoite Mineral Data

Yamatoite Mineral Data

General Yamatoite Information

Chemical Formula:

(Mn++,Ca)3(V+++,Al)2(SiO4)3

Composition:

Molecular Weight = 519.82 gm

Calcium 5.78 % Ca 8.09 % CaO

Manganese 23.78 % Mn 30.70 % MnO

Aluminum 2.60 % Al 4.90 % Al₂O₃

Vanadium 14.70 % V 21.62 % V₂O₃

Silicon 16.21 % Si 34.68 % SiO₂

Oxygen 36.93 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺_2.25Ca_0.75V³⁺_1.5Al_0.5(SiO₄)₃

Environment:

Discredited as Mn goldmanite, yet to be found in nature. A hypothicical Mn-V-dominant garnet end member.

IMA Status:

Discredited IMA 1967 (Dana # Added)

Locality:

Yamato mine, Kagoshima prefecture, Japan. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

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Yamatoite Crystallography

Cell Dimensions:

a = 11.97, Z = 5; V = 1,715.07 Den(Calc)= 2.52

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: I a3d

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

By Intensity(I/I_o): 2.69(1), 3.01(0.7), 1.61(0.5),2.45(0.4), 1.67(0.2), 1.95(0.2), 2.19(0.2), 2.36(0.2),

Physical Properties of Yamatoite

Cleavage:

None

Color:

Honey yellow, Dark red.

Hardness:

6-7 - Orthoclase-Quartz

Streak:

white

Optical Properties of Yamatoite

Gladstone-Dale:

CI calc= -0.512 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3327,KC= 0.2201

Optical Data:

Isotropic, n=1.822-1.855.

Calculated Properties of Yamatoite

Electron Density:

r_electron=2.43 gm/cc
note: r_Yamatoite=2.52 gm/cc.

Fermion Index

Fermion Index = 0.00819
Boson Index = 0.99181

Photoelectric:

PE_Yamatoite= 10.33 barns/electron
U=PE_Yamatoite x r_electron= 25.07 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Yamatoite is Not Radioactive

Yamatoite Classification

Dana Class:

51.4.3b.5 (51)Nesosilicate Insular SiO4 Groups Only

(51.4)with cations in [6] and >[6] coordination

(51.4.3b)Garnet group (Ugrandite series)

51.4.3b.1 Andradite Ca3Fe2(SiO4)3 I a3d 4/m 3 2/m

51.4.3b.2 Grossular Ca3Al2(SiO4)3 I a3d 4/m 3 2/m

51.4.3b.3 Uvarovite Ca3Cr2(SiO4)3 I a3d 4/m 3 2/m

51.4.3b.4 Goldmanite Ca3(V,Al,Fe)2(SiO4)3 I a3d 4/m 3 2/m

51.4.3b.5 Yamatoite ? (Mn,Ca)3(V,Al)2(SiO4)3 I a3d 4/m 3 2/m

Strunz Class:

VIII/A.08-138 VIII - Silicates

VIII/A - Nesosilicates with [SiO4]4-groups, cations of octahedral and cubic orientation [8+6]

VIII/A.08 - Garnet group, Pyrope - Henritermierite

VIII/A.08-10 Pyrope Mg3Al2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-20 Almandine Fe3Al2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-30 Spessartine Mn3Al2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-40 Calderite (Mn,Ca)3(Fe,Al)2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-50 Knorringite Mg3Cr2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-60 Majorite Mg3(Fe,Al,Si)2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-70 Grossular Ca3Al2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-80 Hibschite Ca3Al2(SiO4)3-x(OH)4x(x=0.2-1.5) I a3d 4/m 3 2/m

VIII/A.08-90 Katoite Ca3Al2(SiO4)3-x(OH)4xx=1.5-3 I a3d 4/m 3 2/m

VIII/A.08-100 Hydrougrandite? (Ca,Mg,Fe)3(Fe,Al)2(SiO4)3-x(OH)4x I a3d 4/m 3 2/m

VIII/A.08-110 Andradite Ca3Fe2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-120 Schorlomite Ca3(Ti,Fe,Al)2[(Si,Fe,Fe)O4]3 I a3d 4/m 3 2/m

VIII/A.08-125 Morimotoite Ca3TiFeSi3O12 I a3d 4/m 3 2/m

VIII/A.08-130 Uvarovite Ca3Cr2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-138 Yamatoite (Mn,Ca)3(V,Al)2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-140 Goldmanite Ca3(V,Al,Fe)2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-150 Kimzeyite Ca3(Zr,Ti)2(Si,Al,Fe)3O12 I a3d 4/m 3 2/m

VIII/A.08-160 Henritermierite Ca3(Mn,Al)2(SiO4)2(OH)4 I 4₁/acd 4/m 2/m 2/m

Other Yamatoite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Yamatoite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Yamatoite

(Mn++,Ca)3(V+++,Al)2(SiO4)3
Dana No: 51.4.3b.5 Strunz No: VIII/A.08-138
Locality:

Notes: