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Ferri-clinoholmquistite

Formula:
[ ][Li
 
2
][Mg
 
3
Fe
3+
2
][(OH)
 
2
|Si
 
8
O
 
22
]
System:MonoclinicColour:Black
Hardness:6
Name:For its relationship to Clinoholmquistite


Amphibole Group. Mg-Fe-Mn-Li Clino-Amphibole Subgroup.

Classification of Ferri-clinoholmquistite

IMA status:Approved
Strunz 8th edition ID:8/F.07-80

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

Type Locality:Arroyo de la Yedra, Eastern Pedriza Massif, Sierra de Guadarrama, Madrid, Spain
Place of Conservation of Type Material:Museu Nacional de Ciencias Naturales, Madrid Spain
Geological Setting of type material:Hydrothermal epi-syenite bodies

Physical Properties of Ferri-clinoholmquistite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Black
Hardness (Mohs):6
Fracture:Splintery
Density (measured):3.19 g/cm3
Density (calculated):3.25 g/cm3

Crystallography of Ferri-clinoholmquistite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/m {B1 1 2/m} {C2/m} {C1 2/m 1}
Cell Parameters:a = 9.48Å, b = 17.845Å, c = 5.283Å
β = 102.03°
Ratio:a:b:c = 0.531 : 1 : 0.296
Unit Cell Volume:V 874.10 ų (Calculated from Unit Cell)

Optical Data of Ferri-clinoholmquistite

Type:Biaxial (+)
RI values: nα = 1.699 nβ = 1.703 nγ = 1.708
2V:Measured: 72° , Calculated: 83°
Maximum Birefringence:δ = 0.009

Chart 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 Ferri-clinoholmquistite

Formula:
[ ][Li
 
2
][Mg
 
3
Fe
3+
2
][(OH)
 
2
|Si
 
8
O
 
22
]
All elements listed in formula:Fe, H, Li, Mg, O, Si

Relationship of Ferri-clinoholmquistite to other Species

Related Minerals - Strunz Grouping):

- +
8/F.07-10Cummingtonite
[ ][Mg
 
2
][Mg
 
5
][(OH)
 
2
|Si
 
8
O
 
22
]
8/F.07-30Grunerite
[ ][Fe
2+
2
][Fe
2+
5
][(OH)
 
2
|Si
 
8
O
 
22
]
8/F.07-40Manganocummingtonite
[ ][Mn
2+
2
][Mg
 
5
][(OH)
 
2
|Si
 
8
O
 
22
]
8/F.07-50Manganogrunerite
[ ][Mn
2+
2
][Fe
2+
5
][(OH)
 
2
|Si
 
8
O
 
22
]
8/F.07-60Permanganogrunerite
[ ][Mn
2+
2
][Mn
2+
5
][(OH)
 
2
|Si
 
8
O
 
22
]
8/F.07-70Clinoholmquistite
[ ][Li
 
2
][Mg
 
3
Al
 
2
][(OH)
 
2
|Si
 
4
O
 
11
]
8/F.07-72Fluoro-clinoholmquistite
[ ][Li
 
2
][Mg
 
3
Al
 
2
][(F,OH)
 
2
|Si
 
8
O
 
22
]
8/F.07-73Fluoro-sodic-clinoholmquistite
[ ][Na
 
2
][Mg
 
3
Al
 
2
][(F,OH)
 
2
|Si
 
4
O
 
11
]
8/F.07-75Clinoferroholmquistite
[ ][Li
 
2
][Fe
2+
3
Al
 
2
][(OH)
 
2
|Si
 
8
O
 
22
]
8/F.07-85Ferri-clinoferroholmquistite
[ ][Li
 
2
][Fe
2+
3
Fe
3+
2
][(OH)
 
2
|Si
 
8
O
 
22
]
8/F.07-90Sodic-ferri-clinoferroholmquistite
[(☐,Na)][(Li,☐)
 
2
][Fe
2+
3
Fe
3+
2
][(OH)
 
2
|Si
 
8
O
 
22
]

Other Names for Ferri-clinoholmquistite

Other Languages:
Russian:Ферриклинохолмквистит

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 Ferri-clinoholmquistite

Reference List:American Mineralogist (1998): 83: 167-171.

Iezzi, G., F. Cámara, G. Della Ventura, R. Oberti, G. Pedrazzi, & J.-L. Robert (2004b), Synthesis, crystal structure and crystal-chemistry of ferriclinoholmquistite, []L2Mg3Fe3+2Si8O22(OH)2. Physics and Chemistry of Minerals: 31: 375-385.

Hawthorne, Frank C., and Roberta Oberti (2006), On the classification of amphiboles: Canadian Mineralogist:
44(1): 1-21.

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    Localities for Ferri-clinoholmquistite

    (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.
    Spain
     
    • Madrid
      • Sierra de Guadarrama
        • Eastern Pedriza Massif
    		AmMin 83:167-171 (1998)
    Mineral and/or Locality
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