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|Name:||Named in 1932 by John Parry, Alpheus Fuller Williams, and Frederick Eugene Wright for the type locality at Bultfontein, Free State Province, South Africa.|
This page provides mineralogical data about Bultfonteinite.
Classification of Bultfonteinite
|IMA status:||Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"|
|Strunz 8th edition ID:||8/B.22-40|
|Nickel-Strunz 10th (pending) edition ID:||9.AG.80|
9 : SILICATES (Germanates)
A : Nesosilicates
G : Nesosilicates with additional anions; cations in >  +-  coordination
|Dana 8th edition ID:||18.104.22.168|
52 : NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
4 : Insular SiO4 Groups and O, OH, F, and H2O with cations in  and/or > coordination
|Hey's CIM Ref.:||17.1.16|
17 : Silicates Containing other Anions
1 : Silicates with fluoride (not containing Al)
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Type Occurrence of Bultfonteinite
|Type Locality:||Bultfontein, Lejweleputswa District, Free State Province, South Africa|
|Year of Discovery:||1932|
Physical Properties of Bultfonteinite
Crystallography of Bultfonteinite
|Cell Parameters:||a = 10.99Å, b = 8.18Å, c = 5.67Å|
α = 93.95°, β = 91.32°, γ = 89.85°
|Ratio:||a:b:c = 1.344 : 1 : 0.693|
|Unit Cell Volume:||V 508.38 Å³ (Calculated from Unit Cell)|
Optical Data of Bultfonteinite
|RI values:||nα = 1.587 nβ = 1.590 nγ = 1.597|
|Maximum Birefringence:||δ = 0.010|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
|Dispersion:||r > v|
Chemical Properties of Bultfonteinite
|Simplified for copy/paste:||Ca2(HSiO4)F·H2O|
|Essential elements:||Ca, F, H, O, Si|
|All elements listed in formula:||Ca, F, H, O, Si|
Relationship of Bultfonteinite to other Species
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Bultfonteinite
|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 Bultfonteinite
American Mineralogist: 17: 455.
American Mineralogist: 18: 32.
McIver, Edward J. (1963), The structure of bultfonteinite, Ca4Si3O10F2H6: Acta Crystallographica: 16: 551-558.
Internet Links for Bultfonteinite
|Specimens:||The following Bultfonteinite specimens are currently listed for sale on minfind.com.|
Localities for Bultfonteinite
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: Riverton Mine, Kimberley, Francis Baard District, Northern Cape Province, South AfricaFrom Debbie Woolf, 20th Apr 2014 20:20:42