Bustamite Mineral Data

Bustamite Mineral Data +

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General Bustamite Information

Chemical Formula:

(Mn,Ca)3Si3O9

Composition:

Molecular Weight = 381.92 gm

Calcium 7.87 % Ca 11.01 % CaO

Manganese 32.37 % Mn 41.79 % MnO

Silicon 22.06 % Si 47.20 % SiO₂

Oxygen 37.70 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺_2.25Ca_0.75Si₃O₉

Environment:

In manganese ores formed by metamorphism of manganese-bearing sediments with attendant metasomatism.

IMA Status:

Valid Species (Pre-IMA) 1826

Locality:

"Type" material, from Tetela de Ocampo, Hidalgo, Mexico, is a mixture. Link to MinDat.org Location Data.

Name Origin:

For General Anastasio Bustamente (1780-1853), of Mexico.

Synonym:

ICSD 34164

PDF 44-1455

Bustamite Image

Images:

Bustamite

Comments: Very course crystals of brownish red bustamite to 3cm in pink calcite.
Location: Zinc Corp mine, Broken Hill, NSW, Australia. Scale: 7 cm.
© John Attard

Bustamite Crystallography

Axial Ratios:

a:b:c =2.1532:1:1.9275

Cell Dimensions:

a = 15.46, b = 7.18, c = 13.84, Z = 8; alpha = 89.567°, beta = 94.883°, gamma = 102.783° V = 1,492.72 Den(Calc)= 3.40

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 2.872(1), 3.195(0.7), 2.982(0.6),

Crystal Structure:

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Ohashi Y , Finger L W , American Mineralogist , 63 (1978) p.274-288, The role of octahedral cations in pyroxenoid crystal chemistry. I. Bustamite,, wollastonite, and the pectolite-schizolite-serandite series, sample Mn-BS, from Mitsuka, Gifu, Japan

View Additional jPOWD Structure files for Bustamite
[1] [2] [3]

Physical Properties of Bustamite

Cleavage:

[100] Perfect, [110] Good, [110] Good

Color:

Brown red, Light pink, Pink.

Density:

3.32 - 3.43, Average = 3.37

Diaphaniety:

Transparent to Translucent

Hardness:

5.5-6.5 - Knife Blade-Pyrite

Luminescence:

Fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Bustamite

Gladstone-Dale:

CI meas= 0.016 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.023 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1989,KPDmeas= 0.2003,KC= 0.2036

Optical Data:

Biaxial (-), a=1.64-1.695, b=1.651-1.708, g=1.653-1.71, bire=0.0130-0.0150

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Bustamite

Electron Density:

r_electron=3.27 gm/cc
note: r_Bustamite=3.38 gm/cc.

Fermion Index

Fermion Index = 0.01058
Boson Index = 0.98942

Photoelectric:

PE_Bustamite= 10.09 barns/electron
U=PE_Bustamite x r_electron= 33.04 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Bustamite is Not Radioactive

Bustamite Classification

Dana Class:

65.2.1.2 (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.2)with chains P=3

(65.2.1)Wollastonite group

65.2.1.1a Wollastonite-1A CaSiO3 P1 1

65.2.1.1b Wollastonite-2M* CaSiO3 P 2₁ 2

65.2.1.1c Wollastonite-3A-4A-5A-7A* CaSiO3 P1 1

65.2.1.2 Bustamite (Mn,Ca)3Si3O9 P1 1

65.2.1.3 Ferrobustamite Ca(Fe,Ca,Mn)Si2O6 P1 1

65.2.1.4 Pectolite NaCa2Si3O8(OH) P1 1

65.2.1.5 Serandite Na(Mn,Ca)2Si3O8(OH) P1 1

65.2.1.6 Cascandite Ca(Sc,Fe)Si3O8(OH) C1 1

65.2.1.7 Denisovite (K,Na)Ca2Si3O8(F,OH) Mono

Strunz Class:

VIII/F.18-40 VIII - Silicates

VIII/F - Inosilicates (chain and band) Triplet chains [Si3O9]6-

VIII/F.18 - Wollastonite-2M - Foshagite series

VIII/F.18-10 Wollastonite-1A CaSiO3 P1 1

VIII/F.18-10* Wollastonite-2M* CaSiO3 P 2₁ 2

VIII/F.18-10** Wollastonite-3A-4A-5A-7A* CaSiO3 P1 1

VIII/F.18-30 Ferrobustamite Ca(Fe,Ca,Mn)Si2O6 P1 1

VIII/F.18-40 Bustamite (Mn,Ca)3Si3O9 P1 1

VIII/F.18-50 Cascandite Ca(Sc,Fe)Si3O8(OH) C1 1

VIII/F.18-60 Pectolite NaCa2Si3O8(OH) P1 1

VIII/F.18-70 Denisovite (K,Na)Ca2Si3O8(F,OH) Mono

VIII/F.18-80 Serandite Na(Mn,Ca)2Si3O8(OH) P1 1

VIII/F.18-90 Foshagite Ca4Si3O9(OH)2 P 2₁/m 2/m

VIII/F.18-100 Hillebrandite Ca6Si3O9(OH)6 C mc2₁ mm2

Other Bustamite Information

References:

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

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Bustamite

(Mn,Ca)3Si3O9
Dana No: 65.2.1.2 Strunz No: VIII/F.18-40
Locality:

Notes: