Matsubaraite Mineral Data

Matsubaraite Mineral Data

General Matsubaraite Information

Chemical Formula:

Sr4TiTi4Si4O22

Composition:

Molecular Weight = 1,054.21 gm

Strontium 33.25 % Sr 39.32 % SrO

Titanium 22.71 % Ti 37.89 % TiO₂

Silicon 10.66 % Si 22.80 % SiO₂

Oxygen 33.39 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Sr₄Ti₅Si₄O₂₂

Environment:

Jadeitite boulder found in a river. Perrierite group; structure

IMA Status:

Approved IMA 2002 (Dana # Added)

Locality:

Itoigawa-Ohmi, Niigata Prefecture, Japan Link to MinDat.org Location Data.

Name Origin:

Named after Satoshi Matsubara, specialist for strontium minerals in the National Science Museum, Tokyo, Japan.

Synonym:

IMA2000-027

Matsubaraite Image

Images:

Matsubaraite

Comments: Minute, dark grains of matsubaraite in a very pale green jadeite matrix.
Location: Itoigawa-Ohmi, Niigata Prefecture, Japan. Scale: Picture size 1 cm.
© American Mineralogist

Matsubaraite Crystallography

Axial Ratios:

a:b:c =2.4614:1:2.1112

Cell Dimensions:

a = 13.848, b = 5.626, c = 11.878, Z = 2; beta = 114.19° V = 844.14 Den(Calc)= 4.15

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/a

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

By Intensity(I/I_o): 2.71(1)(021,004,203), 1.95(0.95)(024,406,223), 2.96(0.95)(204,311), 3.09(0.95)(403), 2.17(0.9)(315,421,422)3.01(0.9)(

Crystal Structure:

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Miyajima H , Miyawaki R , Ito K , European Journal of Mineralogy , 14 (2002) p.1119-1128, Matsubaraite, Sr4Ti5(Si2O7)2O8, a new mineral, the Sr-Ti analogue, of perrierite in jadeitite from the Itoigawa-Ohmi district,, Niigata Prefecture, Japan, Locality: Itoigawa-Ohmi district, Niigata Prefecture, Japan

Physical Properties of Matsubaraite

Cleavage:

None

Color:

Blue tinted gray.

Diaphaniety:

Transparent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Fan Shaped - Occurs as radiating crystals shaped like a fan.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

5.5 - Knife Blade

Luster:

Adamantine

Streak:

white

Optical Properties of Matsubaraite

Optical Data:

Biaxial (+)

NCalc= 2.05 - from Gladstone-Dale relationship (KC = 0.2533) where Ncalc=Dcalc*KC+1

Calculated Properties of Matsubaraite

Electron Density:

r_electron=3.89 gm/cc
note: r_Matsubaraite=4.15 gm/cc.

Fermion Index

Fermion Index = 0.05777
Boson Index = 0.94223

Photoelectric:

PE_Matsubaraite= 41.76 barns/electron
U=PE_Matsubaraite x r_electron= 162.42 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Matsubaraite is Not Radioactive

Matsubaraite Classification

Dana Class:

56.2.8.6 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O

(56.2)with cations in [4] and/or >[4] coordination

(56.2.8)Perierite - Chevkinite group

56.2.8.1 Chevkinite-(Ce) (Ce,La,Ca,Th)4(Fe,Mg)2(Ti,Fe)3Si4O22 C 2/m 2/m

56.2.8.2 Strontiochevkinite (Sr,REE)4Fe(Ti,Zr)2Ti2Si4O22 C 2/a 2/m

56.2.8.3 Perrierite-(Ce) (Ce,La,Ca)4(Fe,Mg)2(Ti,Fe)3Si4O22 C 21/a 2/m

56.2.8.4 Orthochevkinite* (Ce,La,Ca,Na,Th)4(Fe,Mg)2(Ti,Fe)3Si4O22 Unk Ortho

56.2.8.5 Rengeite! Sr4ZrTi4Si4O22 P 2₁/a 2/m

56.2.8.6 Matsubaraite ! Sr4TiTi4Si4O22 P 2₁/a 2/m

56.2.8.7 Polyakovite-(Ce)! (Ce,La,Nd,Pr,Ca)4(Mg,Fe)(Cr,Fe)2(Ti,Nb)2Si4O22 C 2/m 2/m

56.2.8.8 IMA2003-017! (REE,Ca)4(Fe,Ti,Fe,[])(Ti,Fe,Fe,Nb)4Si4O22 C 2/m 2/m

Strunz Class:

VIII/C.17-05 VIII - Silicates

VIII/C - Sorosilicates with [Si2O7]6-, with anions unfamiliar to tetraheders [O,OH,F]

VIII/C.17 - Fresnoite - Belkovite series

VIII/C.17-05 Matsubaraite Sr4TiTi4Si4O22 P 2₁/a 2/m

VIII/C.17-15 Rengeite! Sr4ZrTi4Si4O22 P 2₁/a 2/m

VIII/C.17-25 Polyakovite-(Ce)! (Ce,La,Nd,Pr,Ca)4(Mg,Fe)(Cr,Fe)2(Ti,Nb)2Si4O22 C 2/m 2/m

VIII/C.17-30 Perrierite-(Ce) (Ce,La,Ca)4(Fe,Mg)2(Ti,Fe)3Si4O22 C 21/a 2/m

Other Matsubaraite Information

References:

NAME( AmMin v 88, p 1837) PHYS. PROP.(AmMin v 88, p 1837) OPTIC PROP.(AmMin v 88, p 1837)

See Also:

Links to other databases for Matsubaraite :
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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Matsubaraite

Sr4TiTi4Si4O22
Dana No: 56.2.8.6 Strunz No: VIII/C.17-05
Locality:

Notes: