Magnesiohornblende Mineral Data

General Magnesiohornblende Information
Help on Chemical Formula: Chemical Formula: Ca2[Mg4(Al,Fe+++)]Si7AlO22(OH)2
Help on Composition: Composition: Molecular Weight = 821.16 gm
   Calcium     9.76 %  Ca   13.66 % CaO
   Magnesium  11.84 %  Mg   19.63 % MgO
   Aluminum    5.75 %  Al   10.86 % Al2O3
   Iron        1.70 %  Fe    2.43 % Fe2O3
   Silicon    23.94 %  Si   51.22 % SiO2
   Hydrogen    0.25 %  H     2.19 % H2O
   Oxygen     46.76 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca2Mg4Al0.75Fe3+0.25(Si7AlO22)(OH)2
Help on Environment: Environment: Igneous and metamorphic rocks.
Help on IMA Status: IMA Status: Approved IMA 1978
Help on Locality: Locality: Probably common worldwide in "hornblende" granites and shists. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the composition and its relationship to hornblende.
Help on Synonym: Synonym: Aluminomagnesiohornblende
  Hornblende
  ICSD 79834
  PDF 45-1371
 

Magnesiohornblende Image

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Magnesiohornblende   Hornblende

Comments: Dark greenish-black massive magnesiohornblende.
Location: Willi Agatz Mine, Dresden, Saxony, Germany. Scale: Picture size 5.5 cm.
© Thomas Witzke / Abraxas-Verlag

Magnesiohornblende Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.544:1:0.292
Help on Cell Dimensions: Cell Dimensions: a = 9.887, b = 18.174, c = 5.308, Z = 2; beta = 105° V = 921.28 Den(Calc)= 2.96
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.14(1), 8.51(0.55), 2.72(0.35),
Click Here for Large Magnesiohornblende Structure Window Crystal Structure:

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Oberti R , Ungaretti L , Cannillo E , Hawthorne F C , Memmi I , European Journal of Mineralogy , 7 (1995) p.1049-1063, Temperature-dependent Al order-disorder in the, tetrahedral double chain of C2/m amphiboles, Sample: S(3)

 

Physical Properties of Magnesiohornblende

Help on Cleavage: Cleavage: [???] Perfect, [???] Distinct
Help on Color: Color: Brown, Green, Greenish brown, Greenish black, Dark green.
Help on Density: Density: 3 - 3.47, Average = 3.23
Help on Diaphaniety: Diaphaniety: Translucent to opaque
Help on Fracture: Fracture: Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.
Help on Habit: Habit: Columnar - Forms columns
Help on Habit: Habit: Massive - Fibrous - Distinctly fibrous fine-grained forms.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 5-6 - Between Apatite and Orthoclase
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: white
 

Optical Properties of Magnesiohornblende

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.04 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.049 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2226,KPDmeas= 0.2037,KC= 0.2121
Help on Optical Data: Optical Data: Biaxial (-), a=1.616-1.68, b=1.626-1.695, g=1.636-1.7, bire=0.0200, 2V(Calc)=58-88, 2V(Meas)=66-85. Dispersion r > v or r < v.
Help on Pleochroism (x): Pleochroism (x): light green, yellowish green, yellow, greenish brown, or yellow.
Help on Pleochroism (y): Pleochroism (y): dark green, dark yellowish green, brown. Pale, reddish brown, or greenish yellow.
Help on Pleochroism (z): Pleochroism (z): very dark green, dark bluish green, grayish brown, reddish brown, or indigo blue.
 

Calculated Properties of Magnesiohornblende

Help on Electron Density: Electron Density:

relectron=3.22 gm/cc
note: rMagnesiohornblende =3.24 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.02373
Boson Index = 0.97627
Help on Photoelectric: Photoelectric:

PEMagnesiohornblende = 3.05 barns/electron
U=PEMagnesiohornblende x relectron= 9.83 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Magnesiohornblende is Not Radioactive
 

Magnesiohornblende Classification
Help on Dana Class: Dana Class: 66.1.3a.4 (66)Inosilicate Double-Width Unbranched Chains, W=2
  (66.1)Dana Type
  (66.1.3a)Group 2, the calcic amphiboles
 
66.1.3a.1 Tremolite []Ca2Mg5Si8O22(OH)2 C 2/m 2/m
 
66.1.3a.2 Actinolite Ca2(Mg,Fe)5Si8O22(OH)2 C 2/m 2/m
 
66.1.3a.3 Ferro-actinolite []Ca2Fe5Si8O22(OH)2 C 2/m 2/m
 
66.1.3a.4 Magnesiohornblende Ca2[Mg4(Al,Fe)]Si7AlO22(OH)2 C 2/m 2/m
 
66.1.3a.5 Ferrohornblende []Ca2[Fe4(Al,Fe)]Si7AlO22(OH)2 C 2/m 2/m
 
66.1.3a.6 Tschermakite []Ca2(Mg3AlFe)Si6Al2O22(OH)2 C 2/m 2/m
 
66.1.3a.6a Aluminoferrotschermakite! []Ca2(Fe2)3Al2(Si6Al2)O22(OH)2 C 2/m 2/m
 
66.1.3a.6b Ferri-ferrotschermakite! []Ca2(Fe2)3(Fe3)2(Si6Al2)O22(OH)2 C 2/m 2/m
 
66.1.3a.6c Ferrotschermakite! []Ca2(Fe3AlFe)Si6Al2O22(OH) C 2/m 2/m
 
66.1.3a.7 Ferro-aluminotschermakite* Ca2Fe3Al2(Si7Al)O22(OH)2 C 2/m 2/m
 
66.1.3a.8 Ferritschermakite Ca2(Fe,Mg)3Al2(Si7Al)O22(OH)2 C 2/m 2/m
 
66.1.3a.9 Ferroferritschermakite* Ca2(Fe,Mg)3Fe2(Si7Al)O22(OH)2 C 2/m 2/m
 
66.1.3a.10 Edenite NaCa2Mg5Si7AlO22(OH)2 C 2/m 2/m
 
66.1.3a.10a Fluoro-edenite! NaCa2Mg5Si7AlO22(F,OH)2 C 2/m 2/m
 
66.1.3a.11 Ferro-edenite NaCa2Fe5Si7AlO22(OH)2 C 2/m 2/m
 
66.1.3a.12 Pargasite NaCa2(Mg,Fe)4Al(Si6Al2)O22(OH)2 C 2/m 2/m
 
66.1.3a.12a Potassicpargasite! (K,Na)Ca2(Mg,Fe)5Si8O22(OH,F)2 C 2/m 2/m
 
66.1.3a.13 Ferropargasite NaCa2(Fe4Al)Si6Al2O22(OH)2 C 2/m 2/m
 
66.1.3a.13a Ferrochloropargasite! NaCa2(Fe4Al)Si6Al2O22Cl2 C 2/m 2/m
 
66.1.3a.13b Potassic-chloropargasite! (K,Na)Ca2(Mg,Fe2)4Al(Si6Al2O22)(Cl,OH)2 C 2/m 2/m
 
66.1.3a.14 Magnesiohastingsite NaCa2(Mg4Fe)Si6Al2O22(OH)2 C 2/m 2/m
 
66.1.3a.15 Hastingsite NaCa2(Fe4Fe)Si6Al2O22(OH)2 C 2/m 2/m
 
66.1.3a.15a Potassic-chlorohastingsite! (K,Na)Ca2(Fe,Mg)4Fe[Si6Al2O22](Cl,OH)2 C 2/m 2/m
 
66.1.3a.16 Potassic-magnesiosadanagaite (K,Na)Ca2(Mg,Fe,Al,Ti)5[(Si,Al)8O22](OH)2 C 2,Cm,C 2/m Mono
 
66.1.3a.17 Sadanagaite (K,Na)Ca2(Fe,Mg,Al,Ti)5[(Si,Al)8O22](OH)2 C 2,Cm,C 2/m Mono
 
66.1.3a.17a Potassicsadanagaite! (K,Na)Ca2[Fe3(Al,Fe)2][Si5Al3O22](OH)2 C 2,Cm,C 2/m Mono
 
66.1.3a.17b Potassicferrisadanagaite! (K,Na)Ca2(Fe,Mg)2(Fe,Al)2[Si5Al3O22](OH,F,O)2 C 2/m 2/m
 
66.1.3a.17c Magnesiosadanagaite! NaCa2[Mg3(Al,Fe)2]Si5AlO22(OH)2 C 2/m 2/m
 
66.1.3a.18 Kaersutite NaCa2(Mg4Ti)Si6Al2O23(OH)2 C 2/m 2/m
 
66.1.3a.19 Ferrokaersutite NaCa2(Fe4Ti)Si6Al2O22(OH)2 C 2/m 2/m
 
66.1.3a.20 Fluorocannilloite! CaCa2(Mg4Al)Si5Al3O22F2 C 2/m 2/m
 
66.1.3a.20a Cannilloite! CaCa2Mg4Al(Si5Al3)O22(OH)2 C 2/m 2/m
 
66.1.3a.21 IMA2004-034! ([],Na)(Na,Ca)2(Mg,Fe)4Fe[Si8O22](OH)2 C 2/m 2/m
Help on Strunz Class: Strunz Class: VIII/F.10-40 VIII - Silicates
  VIII/F - Inosilicates (chain and band) double chains [Si4O11]6- , Ca2-Amphiboles
  VIII/F.10 - Amphibole group, Tremolite - Sadanagaite series
 
VIII/F.10-10 Tremolite []Ca2Mg5Si8O22(OH)2 C 2/m 2/m
 
VIII/F.10-20 Actinolite Ca2(Mg,Fe)5Si8O22(OH)2 C 2/m 2/m
 
VIII/F.10-30 Ferro-actinolite []Ca2Fe5Si8O22(OH)2 C 2/m 2/m
 
VIII/F.10-40 Magnesiohornblende Ca2[Mg4(Al,Fe)]Si7AlO22(OH)2 C 2/m 2/m
 
VIII/F.10-50 Ferrohornblende []Ca2[Fe4(Al,Fe)]Si7AlO22(OH)2 C 2/m 2/m
 
VIII/F.10-60 Tschermakite []Ca2(Mg3AlFe)Si6Al2O22(OH)2 C 2/m 2/m
 
VIII/F.10-65 Aluminoferrotschermakite! []Ca2(Fe2)3Al2(Si6Al2)O22(OH)2 C 2/m 2/m
 
VIII/F.10-70 Ferrotschermakite! []Ca2(Fe3AlFe)Si6Al2O22(OH) C 2/m 2/m
 
VIII/F.10-75 Ferro-aluminotschermakite* Ca2Fe3Al2(Si7Al)O22(OH)2 C 2/m 2/m
 
VIII/F.10-77 Ferritschermakite Ca2(Fe,Mg)3Al2(Si7Al)O22(OH)2 C 2/m 2/m
 
VIII/F.10-80* Ferri-ferrotschermakite! []Ca2(Fe2)3(Fe3)2(Si6Al2)O22(OH)2 C 2/m 2/m
 
VIII/F.10-80 Ferroferritschermakite* Ca2(Fe,Mg)3Fe2(Si7Al)O22(OH)2 C 2/m 2/m
 
VIII/F.10-90 Edenite NaCa2Mg5Si7AlO22(OH)2 C 2/m 2/m
 
VIII/F.10-92 Fluoro-edenite! NaCa2Mg5Si7AlO22(F,OH)2 C 2/m 2/m
 
VIII/F.10-100 Ferro-edenite NaCa2Fe5Si7AlO22(OH)2 C 2/m 2/m
 
VIII/F.10-104 Cannilloite! CaCa2Mg4Al(Si5Al3)O22(OH)2 C 2/m 2/m
 
VIII/F.10-105 Fluorocannilloite! CaCa2(Mg4Al)Si5Al3O22F2 C 2/m 2/m
 
VIII/F.10-110 Pargasite NaCa2(Mg,Fe)4Al(Si6Al2)O22(OH)2 C 2/m 2/m
 
VIII/F.10-120 Ferropargasite NaCa2(Fe4Al)Si6Al2O22(OH)2 C 2/m 2/m
 
VIII/F.10-125 Potassicpargasite! (K,Na)Ca2(Mg,Fe)5Si8O22(OH,F)2 C 2/m 2/m
 
VIII/F.10-130 Magnesiohastingsite NaCa2(Mg4Fe)Si6Al2O22(OH)2 C 2/m 2/m
 
VIII/F.10-140 Hastingsite NaCa2(Fe4Fe)Si6Al2O22(OH)2 C 2/m 2/m
 
VIII/F.10-150 Kaersutite NaCa2(Mg4Ti)Si6Al2O23(OH)2 C 2/m 2/m
 
VIII/F.10-160 Ferrokaersutite NaCa2(Fe4Ti)Si6Al2O22(OH)2 C 2/m 2/m
 
VIII/F.10-163 Potassicsadanagaite! (K,Na)Ca2[Fe3(Al,Fe)2][Si5Al3O22](OH)2 C 2,Cm,C 2/m Mono
 
VIII/F.10-165 Potassic-magnesiosadanagaite (K,Na)Ca2(Mg,Fe,Al,Ti)5[(Si,Al)8O22](OH)2 C 2,Cm,C 2/m Mono
 
VIII/F.10-170 Magnesiosadanagaite! NaCa2[Mg3(Al,Fe)2]Si5AlO22(OH)2 C 2/m 2/m
 
VIII/F.10-180 Sadanagaite (K,Na)Ca2(Fe,Mg,Al,Ti)5[(Si,Al)8O22](OH)2 C 2,Cm,C 2/m Mono
 
VIII/F.10-220 Potassicferrisadanagaite! (K,Na)Ca2(Fe,Mg)2(Fe,Al)2[Si5Al3O22](OH,F,O)2 C 2/m 2/m
 

Other Magnesiohornblende Information
Help on References: References: PHYS. PROP.(Larousse des Mineraux,1981) OPTIC PROP.(Heinrich65)
Help on See Also: See Also: Links to other databases for Magnesiohornblende :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 -Athena 5 - Crocoite.com Mineral Locations 6 - EUROmin Project 7 - Franklin Minerals(Dunn) 8 -Google Images 9 -Google Scholar 10 -Handbook of Mineralogy (MinSocAm) 11 -Handbook of Mineralogy (UofA) 12 -MinDAT 13 -MinMax(Deutsch) 14 -MinMax(English) 15 -Mineralienatlas (Deutsch) 16 -QUT Mineral Atlas 17 -École des Mines de Paris

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Magnesiohornblende

Ca2[Mg4(Al,Fe+++)]Si7AlO22(OH)2
Dana No: 66.1.3a.4 Strunz No: VIII/F.10-40
Locality:

 

Notes:

 
 
   
 
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