Manganaxinite Mineral Data

Manganaxinite Mineral Data +

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General Manganaxinite Information

Chemical Formula:

Ca2Mn++Al2BO3Si4O12(OH)

Composition:

Molecular Weight = 569.21 gm

Calcium 14.08 % Ca 19.70 % CaO

Manganese 9.65 % Mn 12.46 % MnO

Aluminum 9.48 % Al 17.91 % Al₂O₃

Silicon 19.74 % Si 42.22 % SiO₂

Boron 1.90 % B 6.12 % B₂O₃

Hydrogen 0.18 % H 1.58 % H₂O

Oxygen 44.97 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₂Mn²⁺Al₂(BO₃)Si₄O₁₂(OH)

Environment:

Contact metamorphic, hydrothermal, and alpine vein rocks.

IMA Status:

Valid Species (Pre-IMA) 1909

Locality:

Harz Mts, Germany Link to MinDat.org Location Data.

Name Origin:

From the Greek acine - "axe" in allusion to the acute shape of typical crystals and the from the Latin magnes = "magnet" in reference to Mn in the chemical formula.

Synonym:

Axinite

Manganaxinite Image

Images:

Manganaxinite

Comments: Dark brown crystal of manganaxinite on matrix.
Location: Kibblehouse quarry, Perkiomenville, Pennsylvania, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Manganaxinite Crystallography

Axial Ratios:

a:b:c =0.9769:1:0.7792

Cell Dimensions:

a = 8.978, b = 9.19, c = 7.161, Z = 2; alpha = 102.74°, beta = 98.2°, gamma = 88.26° V = 570.14 Den(Calc)= 3.32

Crystal System:

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

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

By Intensity(I/I_o): 3.16(1), 3.47(0.7), 2.81(0.5),

Crystal Structure:

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Help on Above

Andreozzi G B , Lucchesi S , Graziani G , Russo U , American Mineralogist , 89 (2004) p.1763-1771, Site distribution of Fe2+ and Fe3+ in axinite mineral group:, New crystal-chemical formula, Sample 47

View Additional jPOWD Structure files for Manganaxinite
[1]

Physical Properties of Manganaxinite

Cleavage:

[100] Distinct, [001] Poor, [110] Poor

Color:

Brown, Colorless, Yellowish, Pale violet, Reddish.

Density:

3.27 - 3.29, Average = 3.28

Diaphaniety:

Transparent to subtranslucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Lamellar - Thin laminae producing a lamellar structure.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

6.5-7 - Pyrite-Quartz

Luminescence:

Fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Manganaxinite

Gladstone-Dale:

CI meas= -0.002 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.01 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2072,KPDmeas= 0.2098,KC= 0.2094

Optical Data:

Biaxial (-), a=1.672-1.693, b=1.677-1.701, g=1.681-1.704, bire=0.0090-0.0110, 2V(Calc)=62-82, 2V(Meas)=69-87. Dispersion strong, r < v.

Pleochroism (x):

colorless, yellow, light brown, yellow brown, or pale green.

Pleochroism (y):

colorless, deep yellow, deep blue, pale violet, or violet.

Pleochroism (z):

colorless, pale green, olive yellow, brown, or dark violet.

Calculated Properties of Manganaxinite

Electron Density:

r_electron=3.24 gm/cc
note: r_{Manganaxinite}=3.28 gm/cc.

Fermion Index

Fermion Index = 0.0134
Boson Index = 0.9866

Photoelectric:

PE_{Manganaxinite}= 5.22 barns/electron
U=PE_{Manganaxinite} x r_electron= 16.91 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Manganaxinite is Not Radioactive

Manganaxinite Classification

Dana Class:

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

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

(56.2.2)Axinite group

56.2.2.1 Ferroaxinite Ca2FeAl2BO3Si4O12(OH) P1 1

56.2.2.2 Magnesio-axinite Ca2MgAl2BO3Si4O12(OH) P1 1

56.2.2.3 Manganaxinite Ca2MnAl2BO3Si4O12(OH) P1 1

56.2.2.4 Tinzenite (Ca,Mn,Fe)3Al2BO3Si4O12(OH) P1 1

Strunz Class:

VIII/E.06-30 VIII - Silicates

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

VIII/E.06 - Axinite group, Magnesio-axinite - Ashburtonite series

VIII/E.06-10 Magnesio-axinite Ca2MgAl2BO3Si4O12(OH) P1 1

VIII/E.06-20 Ferroaxinite Ca2FeAl2BO3Si4O12(OH) P1 1

VIII/E.06-30 Manganaxinite Ca2MnAl2BO3Si4O12(OH) P1 1

VIII/E.06-40 Tinzenite (Ca,Mn,Fe)3Al2BO3Si4O12(OH) P1 1

VIII/E.06-50 Papagoite CaCuAlSi2O6(OH)3 C 2/m 2/m

VIII/E.06-60 Ashburtonite HPb4Cu4Si4O12(HCO3)4(OH)4Cl I 4/m 4/m

Other Manganaxinite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)

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Manganaxinite

Ca2Mn++Al2BO3Si4O12(OH)
Dana No: 56.2.2.3 Strunz No: VIII/E.06-30
Locality:

Notes: