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Clino-holmquistite

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Formula:
☐{Li
 
2
}{Mg
 
3
Al
 
2
}(Si
 
8
O
 
22
)(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:MonoclinicColour:Blue
Lustre:VitreousHardness:5 - 6
Member of:Clino-holmquistite Root Name Group > Lithium Amphibole Subgroup > w(OH, F, Cl)-dominant Amphibole Group > Amphibole Supergroup
Name:Named for its relationship to holmquistite.


Originally reported from Tastyg Spodumene Deposit, Tuva Republic, Eastern-Siberian Region, Russia.

Classification of Clino-holmquistite

IMA status: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.
Strunz 8th edition ID:8/F.07-70

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

Lustre: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°
Maximum Birefringence:δ = 0.023

Chart 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:
☐{Li
 
2
}{Mg
 
3
Al
 
2
}(Si
 
8
O
 
22
)(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
Simplified for copy/paste:☐{Li2}{Mg3Al2}(Si8O22)(OH)2
Essential elements:Al, H, Li, Mg, O, Si
All elements listed in formula:Al, H, Li, Mg, O, Si
Common Impurities:Mn,Ca,Li,Na,K

Relationship of Clino-holmquistite to other Species

Member of:Clino-holmquistite Root Name Group > Lithium Amphibole Subgroup > w(OH, F, Cl)-dominant Amphibole Group > Amphibole Supergroup
Other Members of Group:

- +
Clino-ferri-fluoro-holmquistite
☐{Li
 
2
}{Mg
 
3
Fe
3+
2
}(Si
 
8
O
 
22
)F
 
2
Clino-ferri-holmquistite
◻{Li
 
2
}{Mg
 
3
Fe
3+
2
}(Si
 
8
O
 
22
)(OH)
 
2
Clino-ferro-ferri-fluoro-holmquistite
☐{Li
 
2
}{Fe
2+
3
Fe
3+
2
}(Si
 
8
O
 
22
)F
 
2
Clino-ferro-ferri-holmquistite
◻{Li
 
2
}{Fe
2+
3
Fe
3+
2
}(Si
 
8
O
 
22
)(OH)
 
2
Clino-ferro-fluoro-holmquistite
☐{Li
 
2
}{Fe
2+
3
Al
 
2
}(Si
 
8
O
 
22
)F
 
2
Clino-fluoro-holmquistite
◻{Li
 
2
}{Mg
 
3
Al
 
2
}(Si
 
8
O
 
22
)F
 
2
Related Minerals - Strunz Grouping):

- +
8/F.07-10Cummingtonite
☐{Mg
 
2
}{Mg
 
5
}(Si
 
8
O
 
22
)(OH)
 
2
8/F.07-30Grunerite
☐{Fe
2+
2
}{Fe
2+
5
}(Si
 
8
O
 
22
)(OH)
 
2
8/F.07-40Manganocummingtonite
☐{Mn
2+
2
}{Mg
 
5
}(Si
 
8
O
 
22
)(OH)
 
2
8/F.07-50Manganogrunerite
☐{Mn
2+
2
}{Fe
2+
5
}(Si
 
8
O
 
22
)(OH)
 
2
8/F.07-60Permanganogrunerite
☐{Mn
2+
2
}{Mn
2+
5
}(Si
 
8
O
 
22
)(OH)
 
2
8/F.07-72Clino-fluoro-holmquistite
◻{Li
 
2
}{Mg
 
3
Al
 
2
}(Si
 
8
O
 
22
)F
 
2
8/F.07-73Fluoro-sodic-clinoholmquistite
{Na}{Li
 
2
}{Mg
 
4
Al}(Si
 
8
O
 
22
)F
 
2
8/F.07-75Clino-holmquistite Root Name
☐{Li
 
2
}{Z
2+
3
Z
3+
2
}(Si
 
8
O
 
22
)(OH,F,Cl)
 
2
8/F.07-80Clino-ferri-holmquistite
◻{Li
 
2
}{Mg
 
3
Fe
3+
2
}(Si
 
8
O
 
22
)(OH)
 
2
8/F.07-85Clino-ferro-ferri-holmquistite
◻{Li
 
2
}{Fe
2+
3
Fe
3+
2
}(Si
 
8
O
 
22
)(OH)
 
2
8/F.07-90Sodic-ferri-clinoferroholmquistite
Na
 
0
· 5{Li
 
2
}{Fe
2+
3
Fe
3+
2
}(Si
 
8
O
 
22
)(OH)
 
2

Other Names for Clino-holmquistite

Synonyms:
Magnesioclinoholmquistite
Other Languages:
German:Clinoholmquistit
Magnesioclinoholmquistit
Russian:Клинохолмквистит
Spanish:Clinoholmquistita
Magnesioclinoholmquistita

Other Information

Health Warning: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

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  • Localities for Clino-holmquistite

    The 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. ? 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)
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