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Ferro-holmquistite

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Formula:
☐{Li2}{Fe2+3Al2}(Si8O22)(OH)2
The holmquistite group comprises orthorhombic amphiboles in the lithium amphibole subgroup.

Holmquistite is defined with Fe2+Mg and Al>Fe3+ in the C position.
Colour:
Black, dark-violet, light sky-blue.
Lustre:
Vitreous
Hardness:
5 - 6
Specific Gravity:
3.145 (Calculated)
Crystal System:
Orthorhombic
Name:
For its relationship to holmquistite.
This page provides mineralogical data about Ferro-holmquistite.


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Classification of Ferro-holmquistiteHide

Approved
Approval Year:
2004
9.DD.05

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

Physical Properties of Ferro-holmquistiteHide

Vitreous
Transparency:
Translucent
Colour:
Black, dark-violet, light sky-blue.
Streak:
White with a sky-blue tinge (?)
Hardness:
5 - 6 on Mohs scale
Density:
3.145 g/cm3 (Calculated)

Optical Data of Ferro-holmquistiteHide

Type:
Biaxial (-)
RI values:
nα = 1.628 nβ = 1.646 nγ = 1.651
2V:
Calculated: 55°
Max Birefringence:
δ = 0.023
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Pleochroism:
Weak
Comments:
colorless
pale violet blue
blue to deep violet

Chemical Properties of Ferro-holmquistiteHide

Formula:
☐{Li2}{Fe2+3Al2}(Si8O22)(OH)2

The holmquistite group comprises orthorhombic amphiboles in the lithium amphibole subgroup.

Holmquistite is defined with Fe2+Mg and Al>Fe3+ in the C position.
IMA Formula:
◻Li2(Fe2+3Al2)Si8O22(OH)2

Crystallography of Ferro-holmquistiteHide

Crystal System:
Orthorhombic
Cell Parameters:
a = 18.287 Å, b = 17.68 Å, c = 5.278 Å
Ratio:
a:b:c = 1.034 : 1 : 0.299
Unit Cell V:
1706.45 ų

Type Occurrence of Ferro-holmquistiteHide

Place of Conservation of Type Material:
Museum of the Dipartimento di Scienze della Terra, Universita di Pavia #2004-01

Synonyms of Ferro-holmquistiteHide

Other Language Names for Ferro-holmquistiteHide

Relationship of Ferro-holmquistite to other SpeciesHide

Other Members of this group:
Ferri-holmquistite☐{Li2}{Mg3Fe3+2}(Si8O22)(OH)2
Ferro-ferri-holmquistite☐{Li2}{Fe2+3Fe3+2}(Si8O22)(OH)2
Holmquistite☐{Li2}{Mg3Al2}(Si8O22)(OH)2Orth.

Related Minerals - Nickel-Strunz GroupingHide

9.DD.05Ferro-anthophyllite☐{Fe2+2}{Fe2+5}(Si8O22)(OH)2Orth.
9.DD.05Ferro-gedrite☐{Fe2+2}{Fe2+3Al2}(Al2Si6O22)(OH)2Orth.
9.DD.05Gedrite☐{Mg2}{Mg3Al2}(Al2Si6O22)(OH)2Orth.
9.DD.05Holmquistite☐{Li2}{Mg3Al2}(Si8O22)(OH)2Orth.
9.DD.05Proto-ferro-suenoite☐{Mn2+2}{Fe2+5}(Si8O22)(OH)2Orth.
9.DD.05Sodicanthophyllite{Na}{Mg2}{Mg5}(AlSi7O22)(OH)2Orth.
9.DD.05Sodic-ferro-anthophyllite{Na}{Fe2+2}{Fe2+5}(AlSi7O22)(OH)2Orth.
9.DD.05Sodic-ferrogedrite{Na}{Fe2+2}{Fe2+3Al2}(Al3Si5O22)(OH)2Orth.
9.DD.05Sodicgedrite{Na}{Mg2}{Mg3Al2}(Al3Si5O22)(OH)2Orth.
9.DD.05Proto-anthophyllite☐{Mg2}{Mg5}(Si8O22)(OH)2Orth. mmm (2/m 2/m 2/m) : Pnnm

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 Ferro-holmquistiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Camara, F., Oberti, R. (2005) The crystal-chemistry of holmquistites: Ferroholmquistite from Greenbushes (Western Australia) and hints for compositional constraints in BLi amphiboles. American Mineralogist: 90: 1167-1176.
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., 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 Ferro-holmquistiteHide

Localities for Ferro-holmquistiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - 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.
Australia (TL)
 
  • Western Australia
    • Bridgetown-Greenbushes Shire
      • Greenbushes Tinfield
Am Min 90:1167-1176
Mineral and/or Locality  
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