Ferroaxinite Mineral Data

Ferroaxinite Mineral Data +

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General Ferroaxinite Information

Chemical Formula:

Ca2Fe++Al2BO3Si4O12(OH)

Composition:

Molecular Weight = 570.12 gm

Calcium 14.06 % Ca 19.67 % CaO

Aluminum 9.47 % Al 17.88 % Al₂O₃

Iron 9.80 % Fe 12.60 % FeO

Silicon 19.71 % Si 42.16 % SiO₂

Boron 1.90 % B 6.11 % B₂O₃

Hydrogen 0.18 % H 1.58 % H₂O

Oxygen 44.90 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₂Fe²⁺Al₂(BO₃)Si₄O₁₂(OH)

Environment:

Contact metamorphic, hydrothermal, and alpine vein rocks.

IMA Status:

Valid Species (Pre-IMA) 1909

Locality:

Boug d'Oisans, France. Link to MinDat.org Location Data.

Name Origin:

From the Greek acine - "ax" in allusion to the acute shape of typical crystals and the Latin - ferrum - "iron" in reference to the Fe in the chemical formula.

Synonym:

Axinite

ICSD 4343

PDF 27-76

Ferroaxinite Image

Images:

Ferroaxinite

Comments: Doubly terminated ferroaxinite crystal with good luster and form.
Location: Puyva, Polar Ural, Russia. Scale: 3x5x2 cm.
© Fabre Minerals

Ferroaxinite Crystallography

Axial Ratios:

a:b:c =0.9716:1:0.777

Cell Dimensions:

a = 8.957, b = 9.218, c = 7.163, Z = 2; alpha = 102.7°, beta = 98.03°, gamma = 88.03° V = 570.95 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): 2.812(1), 3.16(0.9), 3.46(0.8),

Forms:

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Forms: [ 1 1 1] [ 1 1 1] [ 1 0 0] [ 1 1 0] [ 2 0 1] [ 1 1 0]

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Crystal Structure:

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Swinnea J S , Steinfink H , Rendon-DiazMiron L E , Enciso de la Vega S , American Mineralogist , 66 (1981) p.428-431, The crystal structure of a Mexican axinite

Physical Properties of Ferroaxinite

Cleavage:

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

Color:

Brown, Purplish blue, Gray, Greenish yellow.

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:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Ferroaxinite

Gladstone-Dale:

CI meas= -0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.005 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2072,KPDmeas= 0.2098,KC= 0.2082

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 Ferroaxinite

Electron Density:

r_electron=3.28 gm/cc
note: r_Ferroaxinite=3.32 gm/cc.

Fermion Index

Fermion Index = 0.01545
Boson Index = 0.98455

Photoelectric:

PE_Ferroaxinite= 5.68 barns/electron
U=PE_Ferroaxinite x r_electron= 18.64 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ferroaxinite is Not Radioactive

Ferroaxinite Classification

Dana Class:

56.2.2.1 (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.06-20 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 Ferroaxinite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Larousse des Mineraux,1981) OPTIC PROP.(Heinrich65)

See Also:

Links to other databases for Ferroaxinite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Ecole des Mines de Paris
4 - Franklin Minerals(Dunn)
5 - Franklin Minerals(Palache)
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - HyperPhysics
11 - MinDAT
12 - MinMax(Deutsch)
13 - MinMax(English)
14 - Mineralienatlas (Deutsch)
15 - QUT Mineral Atlas
16 - Ruff.Info

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Ferroaxinite

Ca2Fe++Al2BO3Si4O12(OH)
Dana No: 56.2.2.1 Strunz No: VIII/E.06-20
Locality:

Notes: