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 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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