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Ferroholmquistite

Formula:
☐[Li
 
2
][Fe
2+
3
Al
 
2
][(OH)
 
2
|Si
 
8
O
 
22
]
System:OrthorhombicColour:Black, dark-violet, ...
Lustre:VitreousHardness:5 - 6
Name:For its relationship to holmquistite


Amphibole Group. Mg-Fe-Mn-Li Ortho-Amphibole Subgroup. Ferroholmquistite-Holmquistite Series.

Classification of Ferroholmquistite

IMA status:Approved 2004
Strunz 8th edition ID:8/F.12-30
Nickel-Strunz 10th (pending) edition ID:9.DD.05

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

Type Locality:Greenbushes Mine (Greenbushes pegmatite), Greenbushes Tinfield, Western Australia, Australia
Place of Conservation of Type Material:Museum of the Dipartimento di Scienze della Terra, Universita di Pavia #2004-01
Year of Discovery:1978

Physical Properties of Ferroholmquistite

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

Crystallography of Ferroholmquistite

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

Optical Data of Ferroholmquistite

Type:Biaxial (-)
RI values: nα = 1.628 nβ = 1.646 nγ = 1.651
2V:Calculated: 55°
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
Pleochroism:Weak
Comments:colorless
pale violet blue
blue to deep violet

Chemical Properties of Ferroholmquistite

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

Relationship of Ferroholmquistite to other Species

Series:Forms a series with Holmquistite (see here)
Related Minerals - Nickel-Strunz Grouping):
9.DD.05Anthophyllite
☐[Mg
 
2
][Mg
 
5
][(OH)
 
2
|Si
 
8
O
 
22
]
9.DD.05Ferro-anthophyllite
☐[Fe
2+
2
][Fe
2+
5
][(OH)
 
2
|Si
 
8
O
 
22
]
9.DD.05Ferrogedrite
☐[Fe
2+
2
][Fe
2+
3
Al
 
2
][(OH)
 
2
|Al
 
2
Si
 
6
O
 
22
]
9.DD.05Gedrite
☐[Mg
 
2
][Mg
 
3
Al
 
2
][(OH)
 
2
|Al
 
2
Si
 
6
O
 
22
]
9.DD.05Holmquistite
☐[Li
 
2
][Mg
 
3
Al
 
2
][(OH)
 
2
|Si
 
8
O
 
22
]
9.DD.05Protoferro-anthophyllite
☐[Fe
2+
2
][Fe
2+
5
][(OH)
 
2
|Si
 
8
O
 
22
]
9.DD.05Protomangano-ferro-anthophyllite
☐[Mn
2+
2
][Fe
2+
5
][(OH)
 
2
|Si
 
8
O
 
22
]
9.DD.05Sodicanthophyllite
[Na][NaMg][Mg
 
5
][(OH)
 
2
|Si
 
8
O
 
22
]
9.DD.05Sodic-ferro-anthophyllite
[Na][NaFe
2+
 
][Fe
2+
5
][(OH)
 
2
|Si
 
8
O
 
22
]
9.DD.05Sodic-ferrogedrite
[Na][Fe
2+
2
][Fe
2+
4
Al][(OH)
 
2
|Al
 
2
Si
 
6
O
 
22
]
9.DD.05Sodicgedrite
[Na][Mg
 
2
][Mg
 
4
Al][(OH)
 
2
|Al
 
2
Si
 
6
O
 
22
]
9.DD.05Protoanthophyllite
☐[Mg
 
2
][Mg
 
5
][(OH)
 
2
|Si
 
8
O
 
22
]

Other Names for Ferroholmquistite

Synonyms:
IMA2004-030
German names:
Ferroholmquistit
Spanish names:
Ferroholmquistita

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 Ferroholmquistite

Reference List:American Mineralogist: 90: 1167-1176.

Mineralogical Record: 29: 169-174.

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

Internet Links for Ferroholmquistite

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    Localities for Ferroholmquistite

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    Australia
     
    • Western Australia
      • Greenbushes Tinfield
    		Am Min 90:1167-1176
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