Axinite-(Fe) Mineral Data

General Axinite-(Fe) 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.

Name Pronunciation:

Axinite-(Fe)

Synonym:

Ferro axinite - Renamed Axinite-(Fe) by Mineralogical Record v39 (2008), 131

Ferroaxinite

Axinite-(Fe) Image

Images:

Axinite-(Fe)

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

Axinite-(Fe) 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),

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 Axinite-(Fe)

Cleavage:

{100} Distinct, {001} Poor, {110} Poor

Color:

Brown, Purplish blue, Gray, Greenish yellow.

Density:

3.27 - 3.29, Average = 3.28

Diaphaneity:

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 Axinite-(Fe)

Gladstone-Dale:

CI meas= -0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2079,KPDmeas= 0.2098,KC= 0.2082
Ncalc = 1.68 - 1.69

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 Axinite-(Fe)

Electron Density:

Bulk Density (Electron Density)=3.27 gm/cc
note: Specific Gravity of Axinite-(Fe) =3.31 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Axinite-(Fe)= 5.68 barns/electron
U=PE_Axinite-(Fe) x rElectron Density= 18.59 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Axinite-(Fe) is Not Radioactive

Axinite-(Fe) Classification

Dana Class:

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

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

(56.02.02)Axinite group

56.02.02.01 Axinite-(Fe) Ca2FeAl2BO3Si4O12(OH) P1 1

56.02.02.02 Axinite-(Mg) Ca2MgAl2BO3Si4O12(OH) P1 1

56.02.02.03 Axinite-(Mn) Ca2MnAl2BO3Si4O12(OH) P1 1

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

Strunz Class:

09.BD.20 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BD -Si2O7 groups with additional anions;

09.BD.20 Axinite-(Fe) Ca2FeAl2BO3Si4O12(OH) P1 1

09.BD.20 Axinite-(Mg) Ca2MgAl2BO3Si4O12(OH) P1 1

09.BD.20 Axinite-(Mn) Ca2MnAl2BO3Si4O12(OH) P1 1

09.BD.20 Tinzenite (Ca,Mn,Fe)3Al2BO3Si4O12(OH) P1 1

Other Axinite-(Fe) Information

References:

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

See Also:

Links to other databases for Axinite-(Fe) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Print or Cut-and-Paste your Axinite-(Fe) Specimen Label here :

Axinite-(Fe)

Ca2Fe++Al2BO3Si4O12(OH)
Dana No: 56.02.02.01 Strunz No: 09.BD.20
Locality:

Notes: