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Clino-holmquistite

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Formula:
☐{Li2}{Mg3Al2}(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-holmquistite is defined with
C2+ position: Mg dominant
C3+ position: Al dominant
W position: (OH) dominant
System:
Monoclinic
Colour:
Blue
Lustre:
Vitreous
Hardness:
5 - 6
Name:
Named for its relationship to holmquistite.
Originally reported from Tastyg Spodumene Deposit, Tuva Republic, Eastern-Siberian Region, Russia.

Classification of Clino-holmquistite

Discredited 2004
Explanation of status:
The approval of proposal IMA2004-002 implies the official discreditation of clinoholmquistite, as holotype material from the latter mineral was used for the description of the former, new mineral. Clinoholmquistite is now only a theoretical name in the amphibole nomenclature system.
8/F.07-70

8 : Silicates
F : Inosilicates (chain and band) double chains [Si2O6]4-
07 : Amphibole group, Magnesiocummingtonite - Ferroclinoholmquistite series
66.1.1.6

66 : INOSILICATES Double-Width,Unbranched Chains,(W=2)
1 : Amphiboles - Mg-Fe-Mn-Li subgroup
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Physical Properties of Clino-holmquistite

Vitreous
Colour:
Blue
Streak:
nd.
Hardness (Mohs):
5 - 6
Cleavage:
Perfect
on {110}

Crystallography of Clino-holmquistite

Crystal System:
Monoclinic
Cell Parameters:
a = 9.8Å, b = 17.83Å, c = 5.3Å
β = 109.1°
Ratio:
a:b:c = 0.55 : 1 : 0.297
Unit Cell Volume:
V 875.11 ų (Calculated from Unit Cell)

Optical Data of Clino-holmquistite

Type:
Biaxial (-)
RI values:
nα = 1.610 nβ = 1.627 nγ = 1.633
2V:
Measured: 55° to 61°, Calculated: 60°
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
Dispersion:
relatively strong

Chemical Properties of Clino-holmquistite

Formula:
☐{Li2}{Mg3Al2}(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-holmquistite is defined with
C2+ position: Mg dominant
C3+ position: Al dominant
W position: (OH) dominant
Essential elements:
All elements listed in formula:
Common Impurities:
Mn,Ca,Li,Na,K

Relationship of Clino-holmquistite to other Species

Other Members of Group:
Clino-ferri-fluoro-holmquistite☐{Li2}{Mg3Fe23+}(Si8O22)F2
Clino-ferri-holmquistite◻{Li2}{Mg3Fe23+}(Si8O22)(OH)2
Clino-ferro-ferri-fluoro-holmquistite☐{Li2}{Fe32+Fe23+}(Si8O22)F2
Clino-ferro-ferri-holmquistite◻{Li2}{Fe32+Fe23+}(Si8O22)(OH)2
Clino-ferro-fluoro-holmquistite☐{Li2}{Fe32+Al2}(Si8O22)F2
Clino-fluoro-holmquistite◻{Li2}{Mg3Al2}(Si8O22)F2
8/F.07-10Cummingtonite☐{Mg2}{Mg5}(Si8O22)(OH)2
8/F.07-30Grunerite☐{Fe22+}{Fe52+}(Si8O22)(OH)2
8/F.07-40Manganocummingtonite☐{Mn22+}{Mg5}(Si8O22)(OH)2
8/F.07-50Manganogrunerite☐{Mn22+}{Fe52+}(Si8O22)(OH)2
8/F.07-60Permanganogrunerite☐{Mn22+}{Mn52+}(Si8O22)(OH)2
8/F.07-72Clino-fluoro-holmquistite◻{Li2}{Mg3Al2}(Si8O22)F2
8/F.07-73Fluoro-sodic-clinoholmquistite{Na}{Li2}{Mg4Al}(Si8O22)F2
8/F.07-75Clino-holmquistite Root Name☐{Li2}{Z32+Z23+}(Si8O22)(OH,F,Cl)2
8/F.07-80Clino-ferri-holmquistite◻{Li2}{Mg3Fe23+}(Si8O22)(OH)2
8/F.07-85Clino-ferro-ferri-holmquistite◻{Li2}{Fe32+Fe23+}(Si8O22)(OH)2
8/F.07-90Sodic-ferri-clinoferroholmquistiteNa0.5{Li2}{Fe32+Fe23+}(Si8O22)(OH)2

Other Names for Clino-holmquistite

Other Information

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-holmquistite

Reference List:
Mineralogical Record: 29: 169-174.

Ginzburg, I.V. (1965) Holmquistite and its structural variety clinoholmquistite.
Trudy Mineralogicheskogo Muzeya Akademii Nauk SSSR, 16, 73–89.

Litvin, A.L., Ginzburg, I.V., Egorova, L.N., and Petrunina, A.A. (1975) On the
crystal structure of clinoholmquistite. Konstitutsiya i Svoystva Mineralov,9, 3–6.

Oberti, R., Cámara, F., Ottolini, L. (2005): Clinoholmquistite discredited: The new amphibole end-member fluoro-sodic-pedrizite. The American Mineralogist, 90, 732-736.

Frank C. Hawthorne, Roberta Oberti, George E. Harlow, Walter V. Maresch, Robert F. Martin, John C. Schumacer, Mark D. Welch (2012): Nomenclature of the amphibole supergroup, American Mineralogist, Volume 97, pages 2031–2048

Internet Links for Clino-holmquistite

Localities for Clino-holmquistite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Russia
 
  • Eastern-Siberian Region
    • Tuva Republic
Trans.Min.Mus.Acad.Sci.USSR (1965) 16, 73-80; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow Oberti, R., Cámara, F., and Ottolini, L. (2005) Clinoholmquistite discredited: the new amphibole end-member fluoro-sodic-pedrizite. American Mineralogist, 90, 732–736
AM 63 (1978), 1023; HB2/1 (1995); MM 61 (1997), 295
Spain
 
  • Madrid
    • Manzanares el Real
AmMin 83:167-171 (1998)
Mineral and/or Locality  
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