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Clino-ferri-holmquistite

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Formula:
◻{Li2}{Mg3Fe3+2}(Si8O22)(OH)2
The clino-holmquistite group minerals are monoclinic lithium amphiboles defined with:
A(Na+K+2Ca)< 0.5 apfu,
CLi < 0,5 apfu

Clino-ferri-holmquistite is defined with
C2+ position: Mg dominant
C3+ position: Fe dominant
W position: (OH) dominant
Colour:
Black
Lustre:
Vitreous
Hardness:
6
Specific Gravity:
3.19
Crystal System:
Monoclinic
Name:
The original material used to describe clino-ferri-holmquistite (IMA1995-045) by Caballero et al (1998) (originally named by them as "ferri-clinoholmquistite") was renamed "sodic-ferri-clinoholmquistite" and finally became Clino-ferro-ferri-holmquistite, its current valid name.

The mineral now named clino-ferri-holmquistite was originally published as ferri-ottoliniite (IMA2001-067) in 2001. In the 2012 amphibole nomenclature, it's composition was considered intermediate between clino-ferri-holmquistite and magnesio-riebeckite, and the ottoliniite root name is discredited.

The clino-ferri-holmquistite holotype material empirical formula is A(K0.07Na0.38)B(Na0.70Li1.24Ca0.06)C(Mg1.35Fe2+0.92Mn2+0.13 Zn0.31Fe3+1.71Al0.10Ti0.06Li0.42) Si8 O22 (OH1.51F0.47). As Li>Na in the B position the mineral is considered a clino-ferri-holmquistite, which was approved in september 2014 (Proposal 14-G )
This page provides mineralogical data about Clino-ferri-holmquistite.


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Classification of Clino-ferri-holmquistiteHide

Approved
Approval Year:
2014
9.00.

9 : SILICATES (Germanates)
0 :
0 :

Physical Properties of Clino-ferri-holmquistiteHide

Vitreous
Transparency:
Transparent
Colour:
Black
Hardness:
Fracture:
Splintery
Density:
3.19 g/cm3 (Measured)    3.25 g/cm3 (Calculated)

Optical Data of Clino-ferri-holmquistiteHide

Type:
Biaxial (+)
RI values:
nα = 1.699 nβ = 1.703 nγ = 1.708
2V:
Measured: 72° , Calculated: 83°
Max Birefringence:
δ = 0.009
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
relatively strong

Chemical Properties of Clino-ferri-holmquistiteHide

Formula:
◻{Li2}{Mg3Fe3+2}(Si8O22)(OH)2

The clino-holmquistite group minerals are monoclinic lithium amphiboles defined with:
A(Na+K+2Ca)< 0.5 apfu,
CLi < 0,5 apfu

Clino-ferri-holmquistite is defined with
C2+ position: Mg dominant
C3+ position: Fe dominant
W position: (OH) dominant
IMA Formula:
◻NaLi(Fe3+2Mg3)Si8O22(OH)2

Crystallography of Clino-ferri-holmquistiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Cell Parameters:
a = 9.48 Å, b = 17.845 Å, c = 5.283 Å
β = 102.03°
Ratio:
a:b:c = 0.531 : 1 : 0.296
Unit Cell V:
874.10 ų (Calculated from Unit Cell)

Type Occurrence of Clino-ferri-holmquistiteHide

Place of Conservation of Type Material:
Museu Nacional de Ciencias Naturales, Madrid Spain
Geological Setting of Type Material:
Hydrothermal epi-syenite bodies

Synonyms of Clino-ferri-holmquistiteHide

Other Language Names for Clino-ferri-holmquistiteHide

Relationship of Clino-ferri-holmquistite to other SpeciesHide

Other Members of this group:
Clino-ferri-fluoro-holmquistite☐{Li2}{Mg3Fe3+2}(Si8O22)F2
Clino-ferro-ferri-fluoro-holmquistite☐{Li2}{Fe2+3Fe3+2}(Si8O22)F2
Clino-ferro-ferri-holmquistite◻{Li2}{Fe2+3Fe3+2}(Si8O22)(OH)2Mon. 2/m : B2/m
Clino-ferro-fluoro-holmquistite☐{Li2}{Fe2+3Al2}(Si8O22)F2
Clino-fluoro-holmquistite◻{Li2}{Mg3Al2}(Si8O22)F2

Related Minerals - Nickel-Strunz GroupingHide

9.00.Shkatulkalita
9.00.AlflarseniteNaCa2Be3Si4O13(OH) · 2H2OMon. 2 : P21
9.00.YegoroviteNa4[Si4O8(OH)4] · 7H2OMon. 2/m : P21/b
9.00.FerroericssoniteBaFe2+2 Fe3+(Si2O7)O(OH) Mon. 2/m : B2/m
9.00.Ferrisepiolite(Fe3+,Fe2+,Mg)4((Si,Fe3+)6O15)(O,OH)2 · 6H2OOrth. mmm (2/m 2/m 2/m)
9.00.ZvyaginiteNaZnNb2Ti[Si2O7]20(OH,F)3(H2O)4 + (x < 1)Tric. 1 : P1
9.00.BurnettiteCaVAlSiO6Mon. 2/m : B2/b
9.00.MendigiteMn2Mn2MnCa(Si3O9)2Tric. 1 : P1
9.00.20Rinkite-(Ce)(Ca3Ce)Na(NaCa)Ti(Si2O7)2(OF)F2Mon.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Clino-ferri-holmquistiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Caballero, J.M., Monge, A., La Iglesia, A., Tornos, F. (1998) Ferri-clinoholmquistite, Li2(Fe2+,Mg)3Fe3+2Si8O22(OH)2, a new BLi clinoamphibole from the Pedriza Massif, Sierra de Guadarrama, Spanish Central System. American Mineralogist: 83: 167–171.
Oberti, R., Cámara, F., Caballero, J.M. (2004) Ferri-ottoliniite and ferriwhittakerite, two new end-members of the new Group 5 for monoclinic amphiboles: American Mineralogist: 88: 888-893.
Iezzi, G., Cámara, F., Della Ventura, G., Oberti, R., Pedrazzi, G., Robert, J.-L. (2004) Synthesis, crystal structure and crystal-chemistry of ferriclinoholmquistite, ◻L2Mg3Fe3+2Si8O22(OH)2. Physics and Chemistry of Minerals: 31: 375-385.
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 Clino-ferri-holmquistiteHide

Localities for Clino-ferri-holmquistiteHide

ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Spain (TL)
 
  • Madrid
    • Manzanares el Real
AmMin 83:167-171 (1998)
Mineral and/or Locality  
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