Axinite-(Fe) Mineral Data

Axinite-(Fe) Mineral Data
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General Axinite-(Fe) Information

Help on Chemical Formula: Chemical Formula: Ca2Fe++Al2BO3Si4O12(OH)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Ca2Fe2+Al2(BO3)Si4O12(OH)
Help on Environment: Environment: Contact metamorphic, hydrothermal, and alpine vein rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1909
Help on Locality: Locality: Boug d'Oisans, France. Link to MinDat.org Location Data.
Help on Name Origin: 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.
Help on Name Pronunciation: Name Pronunciation: Axinite-(Fe) Say AXINITE-(FE)
Help on Synonym: Synonym: Ferro axinite - Renamed Axinite-(Fe) by Mineralogical Record v39 (2008), 131
  Ferroaxinite
 

Axinite-(Fe) Image

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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
Help on Axial Ratios: Axial Ratios: a:b:c =0.9716:1:0.777
Help on Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.812(1), 3.16(0.9), 3.46(0.8),
Click Here for Large Axinite-(Fe) Structure Window 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)

Help on Cleavage: Cleavage: {100} Distinct, {001} Poor, {110} Poor
Help on Color: Color: Brown, Purplish blue, Gray, Greenish yellow.
Help on Density: Density: 3.27 - 3.29, Average = 3.28
Help on Diaphaneity: Diaphaneity: Transparent to subtranslucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Lamellar - Thin laminae producing a lamellar structure.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 6.5-7 - Pyrite-Quartz
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Axinite-(Fe)

Help on Gladstone-Dale: 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
Help on Optical Data: 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.
Help on Pleochroism (x): Pleochroism (x): colorless, yellow, light brown, yellow brown, or pale green.
Help on Pleochroism (y): Pleochroism (y): colorless, deep yellow, deep blue, pale violet, or violet.
Help on Pleochroism (z): Pleochroism (z): colorless, pale green, olive yellow, brown, or dark violet.
 

Calculated Properties of Axinite-(Fe)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.27 gm/cc
note: Specific Gravity of Axinite-(Fe) =3.31 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEAxinite-(Fe) = 5.68 barns/electron
U=PEAxinite-(Fe) x rElectron Density= 18.59 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Axinite-(Fe) is Not Radioactive
 

Axinite-(Fe) Classification
Help on Dana Class: 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
Help on Strunz Class: 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
Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Larousse des Mineraux,1981) OPTIC PROP.(Heinrich65)
Help on See Also: See Also: Links to other databases for Axinite-(Fe) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Google Images
4 - Google Scholar
5 - MinDAT
6 - MinMax(Deutsch)
7 - MinMax(English)
8 - Mineralienatlas (Deutsch)
9 - QUT Mineral Atlas
10 - Ruff.Info

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Axinite-(Fe)

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

 

Notes: