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|Hardness:||3 - 4|
|Name:||Named in 1941 by John Joseph Fahey in honor of geologist Wilmot Hyde Bradley [April 4, 1899 Westville, Connecticut, USA - April 12, 1979 Pigeon Hill Road, Bangor, Maine, USA], Chief Geologist of U.S. Geological Survey, who conducted geologic investigations in the Green River area, Wyoming.|
This page provides mineralogical data about Bradleyite.
Classification of Bradleyite
|IMA status:||Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"|
|Strunz 8th edition ID:||5/C.04-10|
|Nickel-Strunz 10th (pending) edition ID:||5.BF.10|
5 : CARBONATES (NITRATES)
B : Carbonates with additional anions, without H2O
F : With (Cl), SO4, PO4, TeO3
|Dana 8th edition ID:||22.214.171.124|
43 : COMPOUND PHOSPHATES, ETC.
2 : Anhydrous Normal Compound Phosphates, etc·
|Hey's CIM Ref.:||22.4.1|
22 : Phosphates, Arsenates or Vanadates with other Anions
4 : Phosphates, arsenates or vanadates with carbonate
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Type Occurrence of Bradleyite
|Type Locality:||John Hay Jr. Well No. 1, Green River Formation, Sweetwater Co., Wyoming, USA|
|Year of Discovery:||1941|
|Geological Setting of type material:||Oil shale deposit.|
|Associated Minerals at type locality:|
Physical Properties of Bradleyite
|Hardness (Mohs):||3 - 4|
|Density (measured):||2.734 g/cm3|
Crystallography of Bradleyite
|Cell Parameters:||a = 8.85Å, b = 6.63Å, c = 5.16Å|
β = 90.42°
|Ratio:||a:b:c = 1.335 : 1 : 0.778|
|Unit Cell Volume:||V 302.76 Å³ (Calculated from Unit Cell)|
|Morphology:||Extremely fine-grained masses.|
Optical Data of Bradleyite
|RI values:||nα = 1.490 nγ = 1.560|
|Maximum Birefringence:||δ = 0.070|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Chemical Properties of Bradleyite
|Essential elements:||C, Mg, Na, O, P|
|All elements listed in formula:||C, Mg, Na, O, P|
Relationship of Bradleyite to other Species
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Bradleyite
|Other Information:||Slowly decomposed by cold water with Na2CO3 released to solution. Readily soluble in dilute HCl.|
|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 Bradleyite
Fahey (1941) American Mineralogist: 26: 646-650.
Brasseur (1946) Bull. soc. roy. sc. Liége: 15: 527.
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 295.
Internet Links for Bradleyite
Localities for Bradleyite
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: Woodsboro, Frederick Co., Maryland, USAFrom Bill Cordua, 13th Dec 2013 02:30:58