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|System:||Orthorhombic||Colour:||White, yellow, dark ...|
Visit gemdat.org for gemological information about Humite. Currently in public beta-test.
Classification of Humite
|IMA status:||Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"|
|Strunz 8th edition ID:||8/B.04-30|
|Nickel-Strunz 10th (pending) edition ID:||9.AF.50|
9 : SILICATES (Germanates)
A : Nesosilicates
F : Nesosilicates with additional anions; cations in ,  and/or only  coordination
|Dana 8th edition ID:||52.3.2c.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.:||17.1.11|
17 : Silicates Containing other Anions
1 : Silicates with fluoride (not containing Al)
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Type Occurrence of Humite
|Type Locality:||Monte Somma, Somma-Vesuvius Complex, Naples Province, Campania, Italy|
|Year of Discovery:||1813|
Physical Properties of Humite
|Colour:||White, yellow, dark orange or brown.|
Crystallography of Humite
|Cell Parameters:||a = 10.24Å, b = 20.72Å, c = 4.73Å|
|Ratio:||a:b:c = 0.494 : 1 : 0.228|
|Unit Cell Volume:||V 1,003.58 Å³ (Calculated from Unit Cell)|
|X-Ray Powder Diffraction:|
Radiation - Copper Kα
Data courtesy of RRUFF project at University of Arizona, used with permission.
Optical Data of Humite
|RI values:||nα = 1.607 - 1.643 nβ = 1.619 - 1.653 nγ = 1.639 - 1.675|
|2V:||Measured: 68° to 81°, Calculated: 70° to 78°|
|Maximum Birefringence:||δ = 0.032|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Chemical Properties of Humite
|Simplified for copy/paste:||(Mg,Fe2+)7(SiO4)3(F,OH)2|
|Essential elements:||F, Mg, O, Si|
|All elements listed in formula:||F, Fe, H, Mg, O, Si|
Relationship of Humite 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 Humite
|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 Humite
American Mineralogist: 56: 1155-1173.
Best Localities for Humite
|Best of Species:||Humite|
Internet Links for Humite
|Specimens:||The following Humite specimens are currently listed for sale on minfind.com.|
Localities for Humite
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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Locality Updated: Foothill Copper Belt, Calaveras Co., California, USAFrom Chester S. Lemanski, Jr., 22nd Jul 2014 23:34:33