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|Name:||In allusion to its monoclinic crystal structure and relationship to humite, which was named after Sir Abraham Hume (1749-1838), English connoisseur and collector of gems, minerals and artwork.|
Fluorine analogue of Hydroxylclinohumite.
May be confused with chondrodite.
Visit gemdat.org for gemological information about Clinohumite. Currently in public beta-test.
Classification of Clinohumite
|IMA status:||Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"|
|Strunz 8th edition ID:||8/B.04-40|
|Nickel-Strunz 10th (pending) edition ID:||9.AF.55|
9 : SILICATES (Germanates)
A : Nesosilicates
F : Nesosilicates with additional anions; cations in ,  and/or only  coordination
|Dana 8th edition ID:||52.3.2d.1|
52 : NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
3 : Insular SiO4 Groups and O, OH, F, and H2O with cations in  coordination only
|Hey's CIM Ref.:||17.1.12|
17 : Silicates Containing other Anions
1 : Silicates with fluoride (not containing Al)
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Type Occurrence of Clinohumite
|Type Locality:||Monte Somma, Somma-Vesuvius Complex, Naples Province, Campania, Italy|
|Year of Discovery:||1876|
Physical Properties of Clinohumite
Crystallography of Clinohumite
|Cell Parameters:||a = 13.71Å, b = 4.75Å, c = 10.29Å|
β = 100.83°
|Ratio:||a:b:c = 2.886 : 1 : 2.166|
|Unit Cell Volume:||V 658.18 Å³ (Calculated from Unit Cell)|
About Crystal AtlasYou may need to scroll this box using your mouse to view the full instructions.
The mindat.org Crystal Atlas allows you to view a selection of crystal drawings of real and idealised crystal forms for this mineral and, in certain cases, 3d rotating crystal objects. You need Java to see these. You can download Java for free - click here to download Java
The 3d models and java code are kindly provided by www.smorf.nl. You can control the movement of the models by holding down the left mouse-button over the 3d model and moving your mouse. Keyboard controls are:
|X-Ray Powder Diffraction:|
Radiation - Copper Kα
Data courtesy of RRUFF project at University of Arizona, used with permission.
Optical Data of Clinohumite
|RI values:||nα = 1.623 - 1.702 nβ = 1.636 - 1.709 nγ = 1.651 - 1.728|
|2V:||Measured: 52° to 90°, Calculated: 64° to 88°|
|Maximum Birefringence:||δ = 0.028|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Chemical Properties of Clinohumite
|Essential elements:||F, Mg, O, Si|
|All elements listed in formula:||F, Fe, H, Mg, O, Si|
Relationship of Clinohumite to other Species
|Member of:||Humite Group|
|Other Members of Group:|
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Clinohumite
|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 Clinohumite
American Mineralogist (1973): 58: 43-49.
V.M. Gekimyants, E.V. Sokolova, E.M. Spiridonov, G. Ferraris, N.V. Chukanov, M. Prencipe, V.N. Avdonin, Yu.A. Polenov (1999): Hydroxylclinohumite Mg9(SiO4)4(OH,F)2 - a new mineral of the humite group. Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva (1999): 128(5): 64-70.
FERRARIS, G., PRENCIPE, M., SOKOLOVA, E.V., GEKIMYANTS, V.M., SPIRIDONOV, E.M. (2000): Hydroxylclinohumite, a new member of the humite group: Twinning, crystal structure and crystal chemistry of the clinohumite subgroup. Zeitschrift für Kristallographie, 215, 169-173.
Langer, K., Platonov, A.N., Matsyuk, S.S., and Wildner, M. (2002) The crystal chemistry of the humite minerals Fe 2+ - Ti 4+ charge transfer and structural allocation of Ti 4+ in chondrodite and clinohumite. European Journal of Mineralogy: 14: 1027-1032.
Internet Links for Clinohumite
|Specimens:||The following Clinohumite specimens are currently listed for sale on minfind.com.|
Localities for Clinohumite
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.
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