Ferrohornblende Mineral Data

Ferrohornblende Mineral Data +

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General Ferrohornblende Information

Chemical Formula:

[ ]Ca2[Fe++4(Al,Fe+++)]Si7AlO22(OH)2

Composition:

Molecular Weight = 947.32 gm

Calcium 8.46 % Ca 11.84 % CaO

Aluminum 4.98 % Al 9.42 % Al₂O₃

Iron 25.05 % Fe 30.34 % FeO / 2.11 % Fe₂O₃

Silicon 20.75 % Si 44.40 % SiO₂

Hydrogen 0.21 % H 1.90 % H₂O

Oxygen 40.53 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₂Fe²⁺₄Al_0.75Fe³⁺_0.25(Si₇AlO₂₂)(OH)₂

Environment:

From granites, granodiorites, and metabasalts; common in amphibolites and schists. Forms a series with magnesiohornblende.

IMA Status:

Approved IMA 1978

Locality:

Common worldwide. Link to MinDat.org Location Data.

Name Origin:

For its ferrous iron content and from the German for horn and to deceive, in allusion to its similarity to valuable minerals in ores.

Synonym:

Aluminoferrohornblende

Barkevicite

Hornblende

ICSD 68063

Oxyhornblende

PDF 44-1478

Ferrohornblende Image

Images:

Click Here for Larger Ferrohornblende Image

Ferrohornblende Hornblende

Comments: Dark gray prismatic crystal of ferrohornblende in a white feldspar matrix.
Location: Monte Somma (Vesuvius), Campania, Italy. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Ferrohornblende Crystallography

Axial Ratios:

a:b:c =0.5475:1:0.2924

Cell Dimensions:

a = 9.96, b = 18.19, c = 5.32, Z = 2; beta = 104.87° V = 931.56 Den(Calc)= 3.38

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 8.52(1), 3.159(0.9), 2.728(0.75),

Crystal Structure:

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Guha R , Nag D K , Iyengar S V P , Indian Minerals , 41 (1987) p.32-41, Structure of an amphibole from Simlipal granite, India, Locality: Simlipal granite, India

Physical Properties of Ferrohornblende

Cleavage:

[???] Perfect, [???] Distinct

Color:

Brown, Green, Greenish brown, Black.

Density:

3 - 3.47, Average = 3.23

Diaphaniety:

Translucent to opaque

Fracture:

Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.

Habit:

Columnar - Forms columns

Habit:

Massive - Fibrous - Distinctly fibrous fine-grained forms.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

5-6 - Between Apatite and Orthoclase

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Ferrohornblende

Optical Data:

Biaxial (-), a=1.687-1.694, b=1.7-1.707, g=1.701-1.712, bire=0.0140-0.0180, 2V(Calc)=30-62, 2V(Meas)=12-76. Dispersion r > v or r < v.

Pleochroism (x):

deep brown or pale greenish brown.

Pleochroism (y):

straw yellow or dark greenish brown.

Pleochroism (z):

yellow or bluish green.

Calculated Properties of Ferrohornblende

Electron Density:

r_electron=3.32 gm/cc
note: r_{Ferrohornblende}=3.38 gm/cc.

Fermion Index

Fermion Index = 0.01531
Boson Index = 0.98469

Photoelectric:

PE_{Ferrohornblende}= 9.42 barns/electron
U=PE_{Ferrohornblende} x r_electron= 31.28 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ferrohornblende is Not Radioactive

Ferrohornblende Classification

Dana Class:

66.1.3a.5 (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

Strunz Class:

VIII/F.10-50 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 Ferrohornblende Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Larousse des Mineraux,1981) OPTIC PROP.(Heinrich65)

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Ferrohornblende

[ ]Ca2[Fe++4(Al,Fe+++)]Si7AlO22(OH)2
Dana No: 66.1.3a.5 Strunz No: VIII/F.10-50
Locality:

Notes: