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Riebeckite

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Emil Riebeck
Formula:
◻Na2(Fe32+Fe23+)Si8O22(OH)2
System:
Monoclinic
Colour:
Usually black, also ...
Lustre:
Vitreous, Sub-Vitreous
Hardness:
5 - 5½
Name:
For Emil Riebeck [June 11, 1853 Preuslitz, Germany - June 22, 1885), German explorer, ethnologist, and mineralogist. Noted author and field collector of artifacts.
Chemically closely related to arfvedsonite.


Classification of Riebeckite

Approved, 'Grandfathered' (first described prior to 1959)
9.DE.25

9 : SILICATES (Germanates)
D : Inosilicates
E : Inosilicates with 2-periodic double chains, Si4O11; Clinoamphiboles
14.20.6

14 : Silicates not Containing Aluminum
20 : Silicates of Fe and alkali metals

Physical Properties of Riebeckite

Vitreous, Sub-Vitreous
Diaphaneity (Transparency):
Translucent, Opaque
Colour:
Usually black, also commonly light blue to blue-black, gray-blue, gray, brown
Streak:
Pale gray to bluish-grey.
Hardness (Mohs):
5 - 5½
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on {110}
Fracture:
Splintery

Optical Data of Riebeckite

Type:
Biaxial (-)
RI values:
nα = 1.680 - 1.698 nβ = 1.683 - 1.700 nγ = 1.685 - 1.706
2V:
Measured: 68° to 85°, Calculated: 62° to 78°
Birefringence:
0.008
Max Birefringence:
δ = 0.005 - 0.008
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
strong
Pleochroism:
Strong
Comments:
X dark blue Z blue gray to yellow green

Chemical Properties of Riebeckite

IMA Formula:
◻Na2(Fe32+Fe23+)Si8O22(OH)2
Mindat.org Formula:
◻[Na2][Fe32+Fe23+]Si8O22(OH)2

Riebeckite is defined as a member of the riebeckite group with Fe2+>Mg in the C2+ position and (OH) dominant in the W position.
Elements listed in formula:
Common Impurities:
Fe,Ti,Mg,Al,Mn

Crystallography of Riebeckite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Space Group Setting:
C2/m
Cell Parameters:
a = 9.76 Å, b = 18.04 Å, c = 5.33 Å
β = 103.59°
Ratio:
a:b:c = 0.541 : 1 : 0.295
Unit Cell Volume:
V 912.18 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Prismatic {110}, frequently very elongated. May be acicular, especially in late cavities. Sometimes is very acicular in fine-grained, light colored aggregates. Well-terminated crystals are uncommon.
X-Ray Powder Diffraction Data:
d-spacingIntensity
8.40 (100)
4.51 (20)
3.42 (10)
3.27 (10)
3.12 (60)
2.80 (20)
2.73 (40)
2.18 (20)
Comments:
ICDD 19-1061

Occurrences of Riebeckite

Type Occurrence of Riebeckite

Relationship of Riebeckite to other Species

Other Members of Group:
Fluoro-riebeckite◻{Na2}{Fe32+Fe23+}(Si8O22)F2
Magnesio-fluoro-riebeckite◻{Na2}{Mg3Fe23+}(Si8O22)F2
Magnesio-riebeckite◻{Na2}{Mg3Fe23+}(Si8O22)(OH)2
9.DE.05Anthophyllite◻Mg2Mg5Si8O22(OH)2
9.DE.05Cummingtonite◻Mg2Mg5Si8O22(OH)2
9.DE.05Clino-holmquistite Root Name☐{Li2}{Z32+Z23+}(Si8O22)(OH,F,Cl)2
9.DE.05Grunerite◻Fe22+Fe52+Si8O22(OH)2
9.DE.05Manganocummingtonite◻Mn2Mg5Si8O22(OH)2
9.DE.05Manganogrunerite◻Mn2Fe52+Si8O22(OH)2
9.DE.05Permanganogrunerite☐{Mn22+}{Mn52+}(Si8O22)(OH)2
9.DE.05Ferro-fluoro-pedrizite{Na}{Li2}{Fe2Al2Li}(Al2Si6O22)F2
9.DE.05Ferri-fluoro-leakeiteNaNa2(Mg2Fe23+Li)Si8O22F2
9.DE.10ActinoliteCa2(Mg4.5-2.5Fe2+0.5-2.5)Σ=5Si8O22(OH)2
9.DE.10Ferri-tschermakite☐{Ca2}{Mg3Fe23+}(Al2Si6O22)(OH)2
9.DE.10Ferro-actinolite◻Ca2Mg2.5-0Fe2+2.5-5Si8O22(OH)2
9.DE.10Ferro-hornblendeCa2Fe42+Al(Si7Al)O22(OH)2
9.DE.10Ferro-tschermakite☐{Ca2}{Fe32+Al2}(Al2Si6O22)(OH)2
9.DE.10JoesmithitePbCa2Mg3Fe23+(Si6Be2)O22(OH)2
9.DE.10Magnesio-hornblendeCa2(Mg4Al)(Si7Al)O22(OH)2
9.DE.10Tremolite◻Ca2Mg5Si8O22(OH)2
9.DE.10Tschermakite◻Ca2(Mg3Al2)(Si6Al2)O22(OH)2
9.DE.10CannilloiteCa(Ca2)(Mg4Al)(Al3Si5O22)(OH)2
9.DE.10Fluoro-cannilloiteCaCa2(Mg4Al)(Si5Al3)O22F2
9.DE.10Parvo-manganotremolite☐{CaMn2+}{Mg5}(Si8O22)(OH)2
9.DE.10Fluoro-tremolite◻Ca2Mg5Si8O22F2
9.DE.10Potassic-fluoro-pargasiteKCa2(Mg4Al)Si6Al2O22F2
9.DE.15EdeniteNaCa2Mg5(Si7Al)O22(OH)2
9.DE.15Ferro-edeniteNaCa2Fe52+(Si7Al)O22(OH)2
9.DE.15Ferro-kaersutite{Na}{Ca2}{Fe32+AlTi}(Al2Si6O22)O2
9.DE.15Ferro-pargasiteNaCa2(Fe42+Al)(Si6Al2)O22(OH)2
9.DE.15HastingsiteNaCa2(Fe42+Fe3+)(Si6Al2)O22(OH)2
9.DE.15KaersutiteNaCa2(Mg3Ti4+Al)(Si6Al2)O22O2
9.DE.15Magnesio-hastingsiteNaCa2(Mg4Fe3+)Si6Al2O22(OH)2
9.DE.15PargasiteNaCa2(Mg4Al)(Si6Al2)O22(OH)2
9.DE.15SadanagaiteNaCa2(Mg3Al2)(Si5Al3)O22(OH)2
9.DE.15Fluoro-edeniteNaCa2Mg5(Si7Al)O22F2
9.DE.15Potassic-ferro-ferri-sadanagaiteKCa2(Fe32+Fe23+)(Si5Al3)O22(OH)2
9.DE.15Potassic-sadanagaiteKCa2Mg3Al2(Si5Al3)O22(OH)2
9.DE.15Potassic-pargasiteKCa2(Mg4Al)(Si6Al2)O22(OH)2
9.DE.15Potassic-ferro-sadanagaiteKCa2(Fe32+Al2)(Si5Al3)O22(OH)2
9.DE.15Magnesio-fluoro-hastingsiteNaCa2(Mg4Fe3+)(Si6Al2)O22F2
9.DE.15Potassic-fluoro-hastingsiteKCa2(Fe42+Fe3+)(Si6Al2)O22F2
9.DE.15Potassic-chloro-hastingsiteKCa2[Fe42+Fe3+](Si6Al2)O22Cl2
9.DE.15Fluoro-pargasiteNaCa2(Mg4Al)(Si6Al2)O22F2
9.DE.15Parvo-mangano-edenite{Na}{CaMn2+}{Mg5}(AlSi7O22)(OH)2
9.DE.15Potassic-chloro-pargasiteKCa2(Mg4Al)(Si6Al2)O22Cl2
9.DE.15Potassic-ferro-chloro-edenite{K}{Ca2}{Fe52+}(AlSi7O22)(Cl,OH)2
9.DE.15Potassic-magnesio-hastingsiteKCa2(Mg4Fe3+)(Si6Al2)O22(OH)2
9.DE.15Potassic-ferro-pargasiteKCa2(Fe42+Al)Si6Al2O22(OH)2
9.DE.15Chromio-pargasiteNaCa2(Mg4Cr)(Si6Al2)O22(OH)2
9.DE.20Ferro-taramiteNa(NaCa)Fe32+Al2(Si6Al2)O22(OH)2
9.DE.20Barroisite◻NaCa[Mg3Al2](Si7Al)O22(OH)2
9.DE.20Ferro-ferri-barroisite☐(CaNa)(Fe32+Fe23+)(AlSi7O22)(OH)2
9.DE.20Ferro-ferri-winchite☐[CaNa][Fe42+(Fe3+,Al)]Si8O22(OH)2
9.DE.20Ferri-barroisite☐(CaNa)(Mg3Fe23+)(AlSi7O22)(OH)2
9.DE.20Ferro-ferri-taramiteNa(CaNa)(Fe32+Fe23+)(Al2Si6O22)(OH)2
9.DE.20Ferro-ferri-katophoriteNa(NaCa)(Fe42+Fe3+)(Si7Al)O22(OH)2
9.DE.20Ferro-barroisite☐{CaNa}{Fe32+Al2}(AlSi7O22)(OH)2
9.DE.20Ferro-richteriteNa2CaFe52+Si8O22(OH)2
9.DE.20Ferro-winchite ☐{CaNa}{Fe42+Al}(Si8O22)(OH)2
9.DE.20Ferro-katophoriteNa2CaFe42+Al(Si7Al)O22(OH)2
9.DE.20Ferri-taramiteNa(CaNa)(Mg3Fe23+)(Al2Si6O22)(OH)2
9.DE.20Magnesiotaramite{Na}{CaNa}{Mg3AlFe3+}(Al2Si6O22)(OH)2
9.DE.20RichteriteNa2CaMg5Si8O22(OH)2
9.DE.20WinchiteNaCa(Mg4Al)Si8O22(OH)2
9.DE.20TaramiteNa2CaMg3Al2(Si6Al2)O22(OH)2
9.DE.20Fluoro-richteriteNa(NaCa)Mg5Si8O22F2
9.DE.20KatophoriteNaNaCa(Mg4Al)(Si7Al)O22(OH)2
9.DE.20Potassic-fluoro-richteriteK(NaCa)Mg5Si8O22F2
9.DE.20Potassic-richteriteK[CaNa][Mg5]Si8O22(OH)2
9.DE.20Ferri-ghoseite◻(NaMn2+)(Mg4Fe3+)Si8O22(OH)2
9.DE.20Ferri-winchite◻NaCa(Mg4Fe3+)Si8O22(OH)2
9.DE.20Fluoro-taramiteNa(NaCa)(Mg3Al2)(Si6Al2)O22F2
9.DE.25ArfvedsoniteNaNa2(Fe42+Fe3+)Si8O22(OH)2
9.DE.25EckermanniteNaNa2(Mg4Al)Si8O22(OH)2
9.DE.25Ferro-eckermanniteNaNa2(Fe42+Al)Si8O22(OH)2
9.DE.25Ferro-glaucophane◻Na2(Fe32+Al2)Si8O22(OH)2
9.DE.25Glaucophane◻Na2(Mg3Al2)Si8O22(OH)2
9.DE.25Potassic-mangani-leakeiteKNa2(Mg2Mn23+Li)Si8O22(OH)2
9.DE.25Mangano-ferri-eckermanniteNaNa2(Mn42+Fe3+)Si8O22(OH)2
9.DE.25Ferri-leakeiteNa(NaLi)(Mg2Fe23+Li)Si8O22(OH)2
9.DE.25Magnesio-riebeckite◻Na2(Mg3Fe23+)Si8O22(OH)2
9.DE.25Magnesio-arfvedsoniteNaNa2(Mg4Fe3+)Si8O22(OH)2
9.DE.25NybøiteNaNa2(Mg3Al2)(Si7Al)O22(OH)2
9.DE.25Mangano-mangani-ungarettiiteNaNa2(Mn22+Mn33+)Si8O22O2
9.DE.25Ferro-ferri-nybøiteNaNa2(Fe32+Fe23+)(Si7Al)O22(OH)2
9.DE.25Clino-ferro-ferri-holmquistite◻Li2(Fe32+Fe23+)Si8O22(OH)2
9.DE.25Ferri-nybøiteNaNa2(Mg3Fe23+](AlSi7O22)(OH)2
9.DE.25Ferro-ferri-leakeite[Na][Na2][Fe22+Fe23+Li]Si8O22(OH)2
9.DE.25Ferro-ferri-fluoro-leakeiteNaNa2(Fe22+Fe23+Li)Si8O22F2
9.DE.25Sodic-ferri-clinoferroholmquistiteNa0.5{Li2}{Fe32+Fe23+}(Si8O22)(OH)2
9.DE.25Magnesio-fluoro-arfvedsoniteNaNa2(Mg4Fe3+)Si8O22F2
9.DE.25Ferri-pedrizite[Na][Li2][Mg2Fe23+Li]Si8O22(OH)2
9.DE.25Potassic-ferri-leakeiteKNa2Mg2Fe23+LiSi8O22(OH)2
9.DE.25Fluoro-nybøiteNaNa2(Mg3Al2)(Si7Al)O22F2
9.DE.25Mangani-dellaventuraiteNaNa2(MgMn23+LiTi4+)Si8O22O2
9.DE.25Fluoro-pedriziteNaLi2(Mg2Al2Li)(Si8O22)F2
9.DE.25Potassic-arfvedsoniteKNa2Fe42+Fe3+Si8O22(OH)2
9.DE.25Mangani-obertiiteNaNa2(Mg3Mn3+Ti4+)Si8O22O2
9.DE.25Potassic-magnesio-fluoro-arfvedsoniteKNa2(Mg4Fe3+)Si8O22F2
9.DE.25Ferro-ferri-pedriziteNaLi2(LiFe22+Fe23+)Si8O22(OH)2
9.DE.25Potassic-magnesio-arfvedsoniteKNa2Mg4Fe3+Si8O22(OH)2
9.DE.25PedriziteNaLi2(LiMg2Al2)(Si8O22)(OH)2
9.DE.25Ferro-pedriziteNaLi2(Fe22+Al2Li)Si8O22(OH)2
9.DE.25Fluoro-leakeiteNaNa2(Mg2Al2Li)Si8O22F2
9.DE.25Ferro-ferri-obertiiteNaNa2(Fe32+Fe3+Ti)Si8O22O2
14.20.1EmeleusiteNa2LiFe3+Si6O15
14.20.2AegirineNaFe3+Si2O6
14.20.4WilkinsoniteNa4(Fe82+Fe43+)O4[Si12O36]
14.20.5TuperssuatsiaiteNa2(Fe3+,Mn2+)3Si8O20(OH)2 · 4H2O
14.20.7 Ferri-anniteKFe32+((Fe3+,Al)Si3O10)(OH)2
14.20.8FenaksiteKNaFe2+Si4O10
14.20.9MontdoriteKFe2+1.5Mn2+0.5Mg0.5Si4O10(F,OH)2

Other Names for Riebeckite

Other Information

Health Risks:
If in fibrous form the fibers, if breathed in, can cause serious and irreversable lung damage. Avoid exposure to dust.

Riebeckite in petrology

An essential component of (items highlighted in red)
Common component of (items highlighted in red)

References for Riebeckite

Reference List:
Addison, C.C., Addison, W.E., Neal, G.H., Sharp, J.H. (1962) Amphiboles. I. The oxidation of crocidolite. Journal of the Chemical Society: 1468-1471.

Hanisch, K. (1966) Messung des Ultrarot-Pleochroismus von Mineralien. VI. Der Pleochroismus des OH-Streckfrequenz in Riebeckit. Neues Jahrbuch für Mineralogie, Monatshefte: 109-112.

Borg, I.Y. (1967) Optical properties and cell parameters in the glaucophane-riebeckite series. Contributions to Mineralogy and Petrology: 15: 67-92.

Mandarino, J.A. (1998) The Second List of Additions and Corrections to the Glossary of Mineral Species (1995). The Amphibole Group. Mineralogical Record: 29: 169-174.

Hawthorne, F.C. (1978) The crystal chemistry of the amphiboles; VIII, The crystal structure and site chemistry of fluor-riebeckite. The Canadian Mineralogist: 16: 187-194.

Hawthorne, F.C. (1983) The crystal chemistry of the amphiboles.The Canadian Mineralogist: 21: 173-480.

Hawthorne, F.C., Oberti, R. (2006) On the classification of amphiboles. The Canadian Mineralogist: 44: 1-21.

Hawthorne, F.C., Oberti, R., Harlow, G.E., Maresch, W.V., Martin, R.F., Schumacher, J.C., Welch, M.D. (2012) Nomenclature of the amphibole supergroup. American Mineralogist: 97: 2031-2048.

Internet Links for Riebeckite

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https://www.mindat.org/min-3418.html
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Localities for Riebeckite

Mineral and/or Locality  
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