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Axinite-(Mg) Mineral Data

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General Axinite-(Mg) Information

Help on Chemical  Formula: Chemical Formula: Ca2MgAl2BO3Si4O12(OH)
Help on Composition: Composition: Molecular Weight = 538.57 gm
   Calcium    14.88 %  Ca   20.82 % CaO
   Magnesium   4.51 %  Mg    7.48 % MgO
   Aluminum   10.02 %  Al   18.93 % Al2O3
   Silicon    20.86 %  Si   44.62 % SiO2
   Boron       2.01 %  B     6.46 % B2O3
   Hydrogen    0.19 %  H     1.67 % H2O
   Oxygen     47.53 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca2MgAl2(BO3)Si4O12(OH)
Help on Environment: Environment: Contact metamorphic, hydrothermal, and alpine vein rocks.
Help on IMA Status: IMA Status: Approved IMA 1975
Help on Locality: Locality: Tanzania. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek acine - "axe" in allusion to the acute shape of typical crystals and the Greek, "Magnesia" a district in Thessaly in reference to the Mg in the chemical formula.
Help on Name Pronunciation: Name Pronunciation: Axinite-(Mg) Say AXINITE-(MG)
Help on Synonym: Synonym: Magnesio-axinite - Renamed Axinite-(Mg) by Mineralogical Record v39 (2008), 131

Axinite-(Mg) Image

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Comments: Cinnamon brown crystal of "axinite" (probably magnesio-axinite).
Location: El Fenomino Tungsten Mine, Northern Baja Californa, Mexico. Scale: Crystal size 2 cm.
© Dave Barthelmy

Axinite-(Mg) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9757:1:0.7778
Help on Cell Dimensions: Cell Dimensions: a = 8.933, b = 9.155, c = 7.121, Z = 2; alpha = 102.59°, beta = 98.28°, gamma = 88.09° V = 562.13 Den(Calc)= 3.18
Help on Crystal System: Crystal System: Triclinic - Pedial H-M Symbol (1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.796(1), 3.139(0.65), 3.44(0.65),

Physical Properties of Axinite-(Mg)

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: Translucent to transparent
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: Fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Axinite-(Mg)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.003 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.029 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2164,KPDmeas= 0.2098,KC= 0.2103
Ncalc = 1.67 - 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-(Mg)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.26 gm/cc
note: Specific Gravity of Axinite-(Mg) =3.28 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEAxinite-(Mg) = 3.05 barns/electron
U=PEAxinite-(Mg) x rElectron Density= 9.95 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Axinite-(Mg) is Not Radioactive

Axinite-(Mg) Classification

Help on  Dana Class: Dana Class: (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 Axinite-(Fe) Ca2FeAl2BO3Si4O12(OH) P1 1 Axinite-(Mg) Ca2MgAl2BO3Si4O12(OH) P1 1 Axinite-(Mn) Ca2MnAl2BO3Si4O12(OH) P1 1 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-(Mg) Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)
Help on See Also: See Also: Links to other databases for Axinite-(Mg) :
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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Dana No: Strunz No: 09.BD.20





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