Mozartite Mineral Data

Mozartite Mineral Data +

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General Mozartite Information

Chemical Formula:

CaMn+++SiO4(OH)

Composition:

Molecular Weight = 204.11 gm

Calcium 19.64 % Ca 27.47 % CaO

Manganese 26.92 % Mn 38.67 % Mn₂O₃

Silicon 13.76 % Si 29.44 % SiO₂

Hydrogen 0.49 % H 4.41 % H₂O

Oxygen 39.19 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaMn³⁺(SiO₄)(OH)

Environment:

Found intergrown with pectolite. Isostructural with vuagnatite and adelite group minerals.

IMA Status:

Approved IMA 1993

Locality:

Circhiara mine, near Faggiona, Val di Vara, La Spezia, eastern Liguria, Italy. Link to MinDat.org Location Data.

Name Origin:

Named for Wolfgang Amadeus Mozart (1756-1791) and his opera "The Magic Flute". The mineral was first noted in 1991, the 200th annivarsary of the composer's death.

Synonym:

ICSD 75925

IMA1991-016

PDF 46-1432

Mozartite Image

Images:

Mozartite

Comments: Massive, crystalline mozartite.
Location: Wessels Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: 9.5 x 9.7 cm.
© John Veevaert

Mozartite Crystallography

Axial Ratios:

a:b:c =0.8081:1:1.2029

Cell Dimensions:

a = 5.838, b = 7.224, c = 8.69, Z = 4; V = 366.49 Den(Calc)= 3.70

Crystal System:

Orthorhombic - DisphenoidalH-M Symbol (2 2 2) Space Group: P 2₁2₁2₁

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

By Intensity(I/I_o): 2.584(1), 5.558(0.86), 3.07(0.73),

Crystal Structure:

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Nyfeler D , Hoffmann C , Armbruster T , Kunz M , Libowitzky E , American Mineralogist , 82 (1997) p.841-848, Orthorhombic Jahn-Teller distortion and Si-OH in mozartite, CaMnO[SiO3OH]: A, single-crystal X-ray, FTIR, and structure modeling study, Sample: at T = 100 K

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

Physical Properties of Mozartite

Cleavage:

None

Color:

Dark red, Reddish brown.

Density:

3.64

Diaphaniety:

Transparent

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Hardness:

6 - Orthoclase

Luster:

Vitreous (Glassy)

Streak:

red

Optical Properties of Mozartite

Gladstone-Dale:

CI meas= 0.043 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.059 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2356,KPDmeas= 0.2395,KC= 0.2503

Optical Data:

Biaxial (+), a=1.84, b=1.855, g=1.92, bire=0.0800, 2V(Calc)=54, 2V(Meas)=50-52.8.

Pleochroism (x):

yellow brown.

Pleochroism (y):

yellow.

Pleochroism (z):

orange red.

Calculated Properties of Mozartite

Electron Density:

r_electron=3.57 gm/cc
note: r_Mozartite=3.64 gm/cc.

Fermion Index

Fermion Index = 0.00687
Boson Index = 0.99313

Photoelectric:

PE_Mozartite= 9.80 barns/electron
U=PE_Mozartite x r_electron= 34.94 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Mozartite is Not Radioactive

Mozartite Classification

Dana Class:

52.4.2.1 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O

(52.4)with cations in [6] and/or > [6] coordination

(52.4.2)Vuagnatite group

52.4.2.1 Mozartite CaMnSiO4(OH) P 2₁2₁2₁ 2 2 2

52.4.2.2 Vuagnatite CaAlSiO4(OH) P 2₁2₁2₁ 2 2 2

Strunz Class:

VIII/B.23-15 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cationes with coordinationnumber between [8] and [12]

VIII/B.23 - Vuagnatite - Chantalite series

VIII/B.23-10 Vuagnatite CaAlSiO4(OH) P 2₁2₁2₁ 2 2 2

VIII/B.23-15 Mozartite CaMnSiO4(OH) P 2₁2₁2₁ 2 2 2

VIII/B.23-20 Chantalite CaAl2SiO4(OH)4 I 4₁/a 4/m

Other Mozartite Information

References:

NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.79,p388,1994) OPTIC PROP.(Am.Min.,Vol.79,p388,1994)

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Mozartite

CaMn+++SiO4(OH)
Dana No: 52.4.2.1 Strunz No: VIII/B.23-15
Locality:

Notes: