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
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:
PEAxinite-(Fe) = 5.68 barns/electron U=PEAxinite-(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
Chemical Formula: 
